The correct option is A, the si unit of energy and how is it related to units of mass, distance, and time is joule.
The joule is a unit of measurement used to express energy or work done. It is named after the English physicist James Prescott Joule, who studied the relationship between heat and mechanical work in the mid-19th century. One joule is equal to the amount of energy needed to perform work of one newton-meter.
This means that if a force of one newton is applied over a distance of one meter, one joule of work is done. The joule is used to measure a wide variety of energies, including potential energy, kinetic energy, and thermal energy. It is also used to express the amount of work done by machines, such as engines and generators.
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Complete Question: -
What is the SI unit of energy and how is it related to units of mass, distance, and time?
a. joule
b. watt
c. kilo
d. Newton
is it possible for the resultant of the electric and magnetic forces on a charge moving simultaneously through both fields to be zero?
Yes, it is possible for the resultant of the electric and magnetic forces on a charge moving simultaneously through both fields to be zero.
This is due to the fact that electric and magnetic forces are perpendicular to one another, meaning that they can be in opposition and cancel each other out.
To explain in more detail, electric fields exert a force on a charged particle that is proportional to its charge and the magnitude of the electric field. This force, Fe, is given by Fe = qE.
Meanwhile, magnetic fields exert a force on a moving charged particle that is proportional to its charge, the magnitude of the magnetic field, and its velocity. This force, Fm, is given by Fm = qv × B.
Since these forces are perpendicular to each other if the electric force is equal in magnitude to the magnetic force but opposite in direction, they can cancel each other out. This will result in a net force of zero on the particle.
Therefore, it is true that it is possible for the resultant of the electric and magnetic forces on a charge moving simultaneously through both fields to be zero.
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A metal cup containing water at 100c is placed in a tank of water at 80c when will the flow of heat stop
The flow of heat will stop when thermal equilibrium is reached between the meta cup and the water tank.
Thermal equilibriumThe flow of heat will stop when the temperature of the water inside the metal cup and the water in the tank reaches thermal equilibrium, meaning they are at the same temperature.
To calculate the time it takes for the two to reach thermal equilibrium, we can use Newton's Law of Cooling:
Q = hAΔT
Assuming the heat transfer coefficient is constant, we can write:
Q1 = Q2
hA1ΔT1 = hA2ΔT2
We can simplify this equation by assuming that the surface area of the metal cup is much smaller than the surface area of the tank of water, so A1 << A2.
This gives us:
hA1ΔT1 = 0
since ΔT2 = 0 when the two are in thermal equilibrium.
Solving for ΔT1:
ΔT1 = 0 / (hA1)
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when rotating the platform, the hanging mass should be removed from the platform. question 2 options: true false
The given statement, while the platform is rotating, the hanging mass remains attached to the test mass and is not removed from the platform is true, if the purpose of the experiment or test is to determine the effect of the hanging mass on the rotation or stability of the platform.
In this case, the hanging mass must remain attached to the test mass during the rotation to observe the behavior of the system under the specified conditions. If the purpose of the experiment or test is to study the effect of the hanging mass on the platform's rotation or stability, the hanging mass must remain attached to the test mass during the rotation. This is because the presence of the hanging mass affects the overall weight and center of gravity of the system. Removing the hanging mass would alter the system's behavior and prevent accurate observations of the phenomenon under investigation. Therefore, if the experiment requires the hanging mass to be present, it must remain attached to the test mass while the platform is rotating.
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--The complete question is, While the platform is rotating, the hanging mass remains attached to the test mass and is not removed from the platform. State true/false.--
What is the transfer of thermal energy away from an object called?
Answer:
convection is the answer
Explanation:
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a point charge q is far from all other charges. at a distance of 2 m from q the electric field is 20n/c. what is the force a charge of 5 coulombs feels
The force a charge of 5 coulombs for a point charge 'q' which is far from all other charges can be calculated by Coulomb's law.
The Coulomb's law states that the force between two point charges is proportional to the product of the charges and inversely proportional to the square of the distance between them:
[tex]F = k * (q_1 * q_2) / r^2[/tex]
where F is the force,
k is Coulomb's constant ([tex]k = 9*10^9[/tex] N m² / C²),
q₁ and q₂ are the charges, and
r is the distance between the charges.
We know that there is only one charge, q, and it is far from all other charges, so we can assume that
q₁ = q and q₂ = 5 C.
We also know that the electric field at a distance of 2 m from q is 20 N/C. The electric field is related to the force per unit charge, so we can use the equation:
[tex]E = F / q_2[/tex]
Therefore To find the force F acting on a charge q₂ at that distance.
Rearranging this equation in terms of F, we get:
[tex]F = E * q_2[/tex]
Substituting the values we have, we get:
F = 20 N/C * 5 C = 100 N
Therefore, a charge of 5 coulombs would feel a force of 100 N due to the point charge q.
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an antenna will propagate rf energy in specific radiation patterns, both horizontally and vertically. how do antenna manufacturers identify the horizontal radiation patterns?
Antenna manufacturers identify the horizontal radiation patterns of an antenna by performing tests in a special chamber known as an anechoic chamber.
This chamber is designed to eliminate any unwanted reflections or echoes of the radio waves, which allows the antenna to be tested in a controlled environment. Tests typically involve the antenna being rotated while the amount of radio frequency energy received by the antenna is measured.
Antenna manufacturers identify the horizontal radiation patterns by measuring the E- and H-plane patterns. To obtain a specific radiation pattern, the manufacturers use different design techniques. The different design techniques that are used by manufacturers to obtain a specific radiation pattern are Waveguide radiating slots. Dipoles and monopoles.Printed dipole antennas.Omnidirectional antennas.
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A wheel is rotating about an axis that is in the z
-direction. The angular velocity ωz
is -6. 00 rad/s
at t
= 0, increases linearly with time, and is +4. 00 rad/s
at t
= 6. 00 s. We have taken counterclockwise rotation to be positive
The formula for angular velocity as a function of time when it rises linearly can be used to address this issue:
ωz(t) = ωz,0 + αz t
If t is time, z,0 is the angular acceleration at rest, and z is the starting angular velocity.
Applying the information provided, we have:
ωz,0 = -6.00 rad/s (initial angular velocity)
z (6.0 s) = +4.0 rad/s (final angular velocity)
t = 6.00 s (time elapsed) (time elapsed)
The angular acceleration z is what we're looking for.
Using the formula's supplied values as substitutes, we obtain:
-6.00 rad/s + z = +4.00 rad/s (6.00 s)
When we simplify and find z, we obtain:
Z = (5.00 rad/s - 6.0 rad/s)
/6.00 s = 1.67 rad/s^2
As a result, the wheel's angular acceleration is 1.67 rad/s2.
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how much electric power (in kw ) does the heat pump use to deliver 19.0 kj/s of heat energy to the house?
The electric power used by the heat pump to deliver 19.0 kJ/s of heat energy to the house is 3.50 kW.
To find out the electric power used by a heat pump to deliver 19.0 kJ/s of heat energy to the house, we need to use the formula: P = Q/t
where P is the electric power used, Q is the heat energy delivered, and t is the time taken to deliver that heat energy.
We know that Q = 19.0 kJ/s, but we don't know the time taken t, so we need to find that out.
The time t can be calculated using the formula:t = Q / m
where m is the rate of heat transfer of the heat pump.
We are given that the heat pump has a coefficient of performance of 3.5. This means that for every 1 kW of electric power used by the heat pump, it delivers 3.5 kW of heat energy to the house.
Therefore, the rate of heat transfer of the heat pump is:m = 3.5 kW / 1 kW = 3.5So, t = Q / m = 19.0 kJ/s / 3.5 kW = 5.43 s
Now that we know the time taken t, we can find out the electric power used P using the formula:P = Q/t = 19.0 kJ/s / 5.43 s = 3.50 kW
Therefore, the electric power used by the heat pump to deliver 19.0 kJ/s of heat energy to the house is 3.50 kW.
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a velocity vector has a magnitude of 22.0 m/s . if its y component is -12.0 m/s , what are the possible values of its x component?
The possible values of the x component of the velocity vector are ±18.44 m/s.
The velocity vector has a magnitude of 22.0 m/s and a y-component of -12.0 m/s. To determine the possible values of its x-component, we can use the Pythagorean theorem.
According to the theorem, the magnitude of a vector (a² + b² = c²) can be determined by the sum of the squares of its components.
In this case, c² = 22², a² = x², and b² = -12². This can be rearranged to solve for x:
x² = c² - b² = 22² - (-12)² = 340
⇒ x = √340 = ±18.44 m/s.
Therefore, the x-component of the vector is either +18.44 m/s or -18.44 m/s.
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how does matter affect your daily lives?
Matter affects our daily lives in the sense all is composed of matter and energy.
What are matter and energy in the Universe and daily life?Matter and energy in the Universe and daily life are two basic elements that characterize the physic system and allow us to understand the world. In regard to matter, it is something that occupies space and has mass, while energy can perform work.
Therefore, with this data, we can see that matter and energy in the Universe and daily life are fundamental to understanding the universe.
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if we monitor a point on a wire where there is a current for a certain time interval, which gives the chargef that moves through the point in that interval?
When we monitor a point on a wire where there is a current for a certain time interval, we obtain the amount of charge that passes through the point in that interval.
What is electric current?An electric current is defined as the flow of electric charge through a conductor.
A wire carrying an electric current must have an overall electric charge. It is observed that when electric charges move through a conductor, the charges are propelled by an electromotive force (EMF).
Electric chargeThe most fundamental concept in electricity is electric charge. A charge is a property of all matter that is either negative or positive.
In matter, electric charges are balanced. An electric charge accumulates on an object when its electrons and protons are not in balance.
When the number of electrons in an object surpasses the number of protons, the object is negatively charged. The object is positively charged when the number of protons exceeds the number of electrons.
Ampere is the SI unit of electric current. When one coulomb of electric charge passes a given point per second, an electric current of one ampere is said to be flowing.
Mathematically, 1A = 1C/s. Therefore, the current passing through a point on a wire for a certain time interval provides us with the amount of charge that passes through that point in that interval.
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the boundary between two adjacent air masses is called the boundary between two adjacent air masses is called an air strip. a front. entrainment. adiabatic.
A front is the line separating two contiguous air masses. Two air masses having differing characteristics, such as temperature, humidity, and density, collide and interact in a small area known as a front.
Cold fronts, warm fronts, stationary fronts, and occluded fronts are the four primary types of fronts. As a cold front enters a region, it pushes the warm air mass out of the way, resulting in a sharp drop in temperature and frequently severe weather. On the other hand, when a warm front approaches a region, it forces the cold air mass out of the way, causing the air to gradually warm up and increasing the likelihood of rain or drizzle. When two weak air masses collide, stationary fronts develop. enough to push the other out of the way, resulting in a stationary boundary between them. Occluded fronts occur when a cold front overtakes a warm front, lifting the warm air mass above the ground and forming a new boundary between the cold air behind the cold front and the cool air ahead of the warm front.
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what is the capacitance per unit length ( f/m ) of a coaxial cable whose inner conductor has a 1.2 mm diameter and the outer cylindrical sheath has a 5.5 mm diameter? assume the space between is filled with air.
The capacitance per unit length of the coaxial cable is approximately 66.7 pF/m
The capacitance per unit length of a coaxial cable can be calculated using the formula:
C = (2πε₀εᵣ) / ln(b/a)
where C is the capacitance per unit length, ε₀ is the permittivity of free space, εᵣ is the relative permittivity of the material between the conductors (in this case, air), a is the radius of the inner conductor, and b is the radius of the outer conductor.
Using the given values, we have:
a = 1.2 mm / 2 = 0.6 mm
b = 5.5 mm / 2 = 2.75 mm
ε₀ = 8.85 x 10^-12 F/m
εᵣ = 1 (for air)
Plugging these values into the formula, we get:
C = (2π x 8.85 x 10^-12 x 1) / ln(2.75 mm / 0.6 mm)
C ≈ 66.7 pF/m
Therefore, the capacitance per unit length of the coaxial cable is approximately 66.7 pF/m when the space between the conductors is filled with air.
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a bicycle wheel has a radius of 0.304 m and a rim whose mass is 2.50 kg. the wheel has 50 spokes, each with a mass of 0.0100 kg. (a) calculate the moment of inertia of the rim about the axle. (b) determine the moment of inertia of any one spoke, assuming it to be a long, thin rod that can rotate about one end. (c) find the total moment of inertia of wheel, including the rim and all 50 spokes.
The moment of inertia of the bicycle wheel with radius of 0.304m and 50 spoke, rim with mass 2.50 kg for rim about the axle is 0.229 kg·m² , moment of inertia of any one spoke is 0.00186 kg·m² and moment of inertia of the wheel, including the rim and all 50 spokes is 0.592 kg·m².
(a) The moment of inertia of the rim about the axle, we use the formula for the moment of inertia of a thin hoop.
We substitute the mass of the rim and the radius of the wheel into the formula and get the moment of inertia of the rim
The moment of inertia of the rim about the axle:
[tex]I_{rim} = MR^2[/tex]
where M is the mass of the rim and
R is the radius of the wheel.
Substituting the given values, we get:
[tex]I_{rim} = (2.50 kg) *(0.304 m)^2 = 0.229 kg*m^2[/tex]
Therefore, the moment of inertia of the rim about the axle is 0.229 kg·m².
(b) The moment of inertia of any one spoke, we use the formula for the moment of inertia of a long, thin rod rotating about one end.
We substitute the mass of the spoke and its length into the formula and get the moment of inertia of one spoke.
[tex]I_{spoke} = (1/3)ML^2[/tex]
where M is the mass of the spoke and
L is its length.
Substituting the given values, we get:
[tex]I_{spoke} = (1/3) *(0.0100 kg)*(2 * 0.304 m)^2= 0.00186 kg*m^2[/tex]
Therefore, the moment of inertia of any one spoke is 0.00186 kg·m².
(c) The total moment of inertia of the wheel, we use the parallel axis theorem.
The moment of inertia of the wheel about the center of mass is given by:
[tex]I_{center} = I_{rim} + 50*I_{spoke}[/tex]
Substituting the values we found in parts (a) and (b), we get:
[tex]I_{center} = 0.229 kg*m^2 + 50 * 0.00186 kg*m^2 = 0.324 kg*m^2[/tex]
The distance between the center of mass and the axle is equal to the radius of the wheel, so we can use the parallel axis theorem to find the total moment of inertia:
[tex]I_{total} = I_{center} + Md^2[/tex]
where M is the total mass of the wheel (rim plus spokes) and
d is the distance between the center of mass and the axle.
Substituting the given values, we get:
M = 2.50 kg + 50 × 0.0100 kg = 3.00 kg
d = 0.304 m
[tex]I_{total} = 0.324 kg*m^2 + (3.00 kg) *(0.304 m)^2= 0.592 kg*m^2[/tex]
Therefore, the total moment of inertia of the wheel, including the rim and all 50 spokes, is 0.592 kg·m².
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if an object is raised twice as high, its potential energy will be four times as much. half as much twice as much. impossible to determine unless the time is given.
If an object is raised twice as high, its potential energy will be four times as much.
Potential energy Gravitational potential energy According to the question, if an object is raised twice as high, its potential energy will be four times as much.
The potential energy is the stored energy of an object. It depends on an object’s position or configuration.
Potential energy is classified into three types: elastic potential energy, gravitational potential energy, and electric potential energy.
The gravitational potential energy of an object is the energy stored in an object when it is moved against the gravitational force. It depends on the mass of an object, the acceleration due to gravity, and the height an object is above the ground.
The equation for gravitational potential energy is:
GPE = mgh where GPE is gravitational potential energy in joules (J)m is the mass of the object in kilograms (kg)g is the acceleration due to gravity in meters per second squared (m/s²)h is the height of the object in meters (m).
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what is unusual about the position of uranus and neptune in the nice model of solar system formation?
Uranus and Neptune are unusual in the Nice model of solar system formation because they are in different regions than the other planets.
The Nice model proposes that the giant planets formed much further from the Sun than the inner planets.
Specifically, Uranus and Neptune are thought to have formed at a distance of 5-20 AU, much farther than the other planets.
They are also thought to have moved outwards from this region, and then migrated back inwards to their current positions.
This outward migration is known as "jumping Jupiter", as it was caused by the gravitational influence of Jupiter.
Uranus and Neptune are also thought to have been affected by the orbits of two hypothetical planets called "Phaeton" and "Tyche".
The presence of these planets, which are no longer believed to exist, would have affected the orbits of the two outermost planets, resulting in them having the highly inclined orbits they currently possess.
Uranus and Neptune are unusual in the Nice model of solar system formation because they are in different regions than the other planets,
And their orbits are thought to have been affected by the gravitational influence of Jupiter and two hypothetical planets, Phaeton and Tyche.
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which of the following relationships about a coil are true? check all that apply. which of the following relationships about a coil are true?check all that apply. the induced emf is proportional to the resistance of the coil. the induced emf is proportional to the time derivative of the current in the coil. the induced emf is proportional to the self-inductance of the coil. the induced emf is proportional to the current in the coil.
The induced emf is proportional to the time derivative of the current in the coil. It is also proportional to the self-inductance of the coil and current in the coil. The correct options are B, C, and D.
Thus, the induced electromotive force (emf) in a coil is proportional to the rate of change of magnetic flux through the coil, according to Faraday's equation of electromagnetic induction.
The coil's self-inductance affects the induced emf in a direct proportion. A coil's capacity to produce an emf as the current flowing through it varies is known as self-inductance. The coil's self-inductance determines how much induced emf is generated. The relationship between the induced emf and coil current is linear. The induced emf in a coil opposes the change that it causes, according to Lenz's law.
Thus, the ideal selection is option B, C, and D.
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which of the following relationships about a coil are true?
A. the induced emf is proportional to the resistance of the coil.
B. the induced emf is proportional to the time derivative of the current in the coil.
C. the induced emf is proportional to the self-inductance of the coil.
D. the induced emf is proportional to the current in the coil.
the dimension of time is t. and the dimension of length is l. in dimensional analysis, what is the dimension of an acceleration?
The dimension of acceleration is L T⁻².
In the dimensional analysis, the dimension of acceleration is L T⁻² where L stands for length and T stands for time.
Acceleration can be defined as the rate of change of velocity over time. It can also be expressed as a vector quantity that indicates the change in the speed or direction of an object.
a=v/t
where v= change in velocity (m/s) and t= time (s)
In physics, dimensional analysis is a useful tool for checking the validity of a proposed equation or law. It is a way of expressing the units of physical quantities in terms of their fundamental dimensions. This process helps to identify the correct combination of dimensions for a particular physical quantity.
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We can set up the equation:
l * √2 = 24√2
dividing both sides by √2:
l = 24
so, the length of the frame is 24 units.
Let's denote the dimensions of the frame as length (l) and width (w). since the diagonal of the frame makes a 45-degree angle with one side, we can use the properties of a 45-45-90 right triangle to find the relationship between the diagonal and the sides.
in a 45-45-90 triangle, the sides are in the ratio 1:1:√2. since the diagonal of the frame is 24√2, it is the hypotenuse of a 45-45-90 triangle.
according to the ratio, the hypotenuse (diagonal) is √2 times the length (l) of the side. since the frame is rectangular, the width (w) would be the same as the length (l).
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What is the mass of an object if a force of 30 N causes it to accelerate at 1. 5 m/s/s?
The mass of an object if a force of 30 N causes it to accelerate at 1. 5 m/s^2 is 11.33
Newton's second law results in force = mass times acceleration
17 = mass x 1.5
mass = 17/1.5
mass = 11.33
Force is a physical amount that describes the interplay between items. it's far a vector quantity, which means it has both magnitude and course. Force can cause an object to accelerate or change its shape. According to Newton's first law of motion, an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.
Newton's second law of motion relates force to acceleration, stating that the acceleration of an object is directly proportional to the force applied to it and inversely proportional to its mass. Newton's third law of motion states that every action has an equal and opposite reaction, meaning that when two objects interact, they exert equal and opposite forces on each other. There are many types of forces, including gravitational, electromagnetic, frictional, and normal.
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the photo at right was taken through a spectroscope. what color was the pigment extract used to produce this spectrum?
The pigment extract used to produce the spectrum in the photo is not given, so the answer is undeterminable.
To create this spectrum, a spectroscope is used to disperse the colors from a specific pigment extract and separate them into their individual colors in the visible spectrum. The image given in the question is a spectrum that was taken through a spectroscope.
A spectroscope is a scientific instrument used to analyze the colors or wavelengths of light. It works by separating light into its component colors or wavelengths, which produces a spectrum. This spectrum can be used to identify the chemical composition of substances.
A pigment extract is a mixture of various pigments extracted from a substance. For example, a pigment extract from a plant would contain various pigments such as chlorophyll, carotenoids, and anthocyanins. The color of the pigment extract would depend on the type and concentration of pigments present in the extract.
In summary, without knowing the specific pigment extract used to produce the spectrum, it is impossible to determine the color of the pigment extract.
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the maximum horizontal distance from the center of the robot base to the end of its end effector is known as .
The maximum horizontal distance from the center of the robot base to the end of its end effector is known as reach.
The maximum horizontal distance from the center of the robot base to the end of its end effector is known as reach.
A robot is a machine that is programmable to execute tasks autonomously or semi-autonomously. Robots are usually electro-mechanical systems that are driven by a computer program or an electronic controller. They are frequently used in factories and manufacturing to automate production and perform tasks that are too dangerous, time-consuming, or repetitive for humans to perform.
Robotics is a branch of technology that deals with the design, construction, operation, and application of robots. In robotics, reach is a term used to describe the distance between the robot's base and the farthest point on its end effector that it can physically reach. It is usually given in three dimensions:
horizontal reach, vertical reach, and depth reach. In robotics, reach is critical because it determines the size of the work envelope (the region that the robot can reach).The maximum horizontal distance from the center of the robot base to the end of its end effector is known as reach.
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from the results, was there a good agreement between the experimental acceleration and the theoretical (expected) acceleration? what causes the difference? discuss sources of experimental uncertainty for this experiment
Repeating the experiment multiple times and averaging the results can help reduce measurement errors and improve accuracy.
Acceleration is a physical quantity that describes the rate at which the velocity of an object changes over time. If an object is moving in a straight line, acceleration can be positive or negative depending on whether the object is speeding up or slowing down. If the object is turning or changing direction, acceleration is not only a change in speed but also a change in direction.
The most common formula to calculate acceleration is [tex]a = (v_f - v_i) / t,[/tex]where "a" is acceleration, "[tex]v_f[/tex]" is the final velocity of the object, "[tex]v_i[/tex]" is the initial velocity of the object, and "t" is the time interval during which the velocity changes.
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a marine biologist is preparing a deep-sea submersible for a dive. the sub stores breathing air under high pressure in a spherical air tank that measures 78.0 cm wide. the biologist estimates she will need 3700. l of air for the dive. calculate the pressure to which this volume of air must be compressed in order to fit into the air tank. write your answer in atmospheres. be sure your answer has the correct number of significant digits.
The pressure to which this volume of air must be compressed in order to fit into the air tank is 0.13 atm.
What is the ideal gas law?The ideal gas law is pV = nRT. Where p is the pressure, V is the volume, n is the number of moles, R is the universal gas constant, and T is the temperature.
The air tank is a sphere, so the volume is given by V = 4/3πr², where r is the radius. Given that the tank measures 78.0 cm wide,
the radius is r = 78.0/2
= 39.0 cm
= 0.39 m.
Hence, V = 4/3π(0.39)³
= 0.019 m³
The biologist needs 3700 L of air, which is equivalent to 3.7 m³. Therefore, the number of moles of gas is
n = PV/RT,
where P is the pressure, R is the gas constant (8.31 J/mol·K), and T is the temperature, which we assume to be constant.
Rearranging
P = nRT/V.
Substituting the given values,
P = (3.7)(8.31)(298)/0.019 ≈ 12720 Pa
Converting to atmospheres: 1 atm = 101325 Pa.
Therefore, the pressure to which the air must be compressed is:
P/101325 atm/Pa ≈ 0.125 atm or 0.13 atm (rounded to two significant digits).
Therefore, the answer is 0.13 atm.
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cellular phones use radio waves to transmit information. if your cell phone uses a frequency of 1800 mhz , what is the wavelength of the electromagnetic radiation emitted by your phone?
The wavelength of the electromagnetic radiation emitted by your cell phone, which uses a frequency of 1800 MHz, is approximately 166 meters.
Radio waves are a type of electromagnetic radiation, which are made up of electric and magnetic fields. These fields oscillate, or vibrate, at a certain frequency and travel at the speed of light.
The wavelength of a radio wave is the distance between two points in the wave where the electric and magnetic fields are in the same direction.
It is determined by the equation wavelength = speed of light divided by frequency.
Therefore, the wavelength of the electromagnetic radiation emitted by your cell phone is calculated by dividing the speed of light (299,792,458 meters per second) by its frequency of 1800 MHz, which is equal to 166 meters.
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explain the use of air bags and seat belts in terms of momentum and impulse. please provide examples (and calculations) to elaborate your concepts.
Answer:
Explanation:
A seatbelt is designed to stretch a bit when the car decelerates rapidly. You travel forward a little while being stopped - you do not stop sharply as you would if you hit the dashboard. The seatbelt stretching increases the time over which your momentum is changed, thereby decreasing the force experienced by your body.
Airbags are made from a strong coated fabric. They are stored in a module mounted on the steering wheel and dashboard and side panels of the car. The inflation of them is initiated by crash sensors that activate upon impact at speeds of more than 10-15 miles per hour. They are mounted in several locations on the car body. In a crash, the sensor sends an electrical signal to the airbag which then causes the airbag to deploy. It ignites a chemical propellant which produces nitrogen gas, which then inflates the bag itself.
during angular motion, what is the relationship between the length of the moment arm and the torque created (when the force used is constant)?
During angular motion, the length of the moment arm is directly proportional to the torque created when the force used is constant.
What is torque?Torque refers to the rotational equivalent of force. It is the product of force and the moment arm. The torque created depends on the length of the moment arm and the force applied perpendicular to the moment arm. Mathematically,
Torque (τ) = Force (F) × Moment Arm (d)
This means that if the force is constant and the length of the moment arm is increased, the torque created also increases. On the other hand, if the length of the moment arm is decreased, the torque created also decreases. Therefore, it can be concluded that there is a direct relationship between the length of the moment arm and the torque created when the force used is constant.
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a model depicts two balloons of the same size with identical negative charges being moved toward one another at the same speed. how will the balloons interact with each other?
Answer:
they will repel, moving in opposite,
Explanation
a rocket releases a satellite into a circular orbit 785 km above earth's surface. how fast must the satellite be going to stay in this orbit? give your answer in km/s.
Therefore, the speed of the satellite must be 7.471 km/s to stay in this circular orbit 785 km above earth's surface.
What is the speed of a satellite?A rocket releases a satellite into a circular orbit 785 km above the earth's surface. To stay in this orbit, the satellite must be going at a certain speed. To calculate this speed:
`v = sqrt(GM/r)`
where: v is the velocity of the satellite,
GM is the universal gravitational constant (6.67 x 10^-11 Nm^2/kg^2) multiplied by the mass of the earth,
r is the distance between the center of the earth and the satellite (785 km + radius of the earth)
Using the given values:
v = sqrt(6.67 x 10^-11 * 5.97 x 10^24 / (785 + 6,371))v
= sqrt(3.99 x 10^14 / 7,156)v
= sqrt(55,825,822)
The velocity of the satellite must be approximately 7,471 m/s or 7.471 km/s to stay in this orbit.
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an object falls freely from rest on a planet where the acceleration due to gravity is 20 m/s2. after 5 seconds, the object will have a speed of
Answer : If an object falls freely from rest on a planet where the acceleration due to gravity is 20 m/s2 then after 5 seconds, the object will have a speed of 100 m/s
This can be calculated using the equation v = a*t, where v is the velocity, a is the acceleration due to gravity, and t is the time elapsed. Therefore, in this case, v = 20 m/s2 * 5 s = 100 m/s. These values are given in question, so we just have to put them in equation.
Since the object is falling freely, its acceleration remains constant and it follows a uniform acceleration motion. Therefore, the velocity of the object will increase linearly with time. After 10 seconds, the velocity will double to 200 m/s, and so on.
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describe the relative intensity of sound produced by the tuning fork as detected by the plugged and unplugged ears
The relative intensity of sound produced by the tuning fork will be higher when detected by plugged ears, and lower when detected by unplugged ears.
When detected by plugged ears, the intensity of sound produced by the tuning fork will be higher due to the fact that the sound waves are unable to escape and are instead reflected back into the ear canal. This is because the ear canal is blocked off, creating a closed system and thus more intense sound waves.
Conversely, when detected by unplugged ears, the intensity of sound produced by the tuning fork will be lower as the sound waves are able to escape the ear canal. This is because the ear canal is open, creating an open system and thus less intense sound waves.
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