Answer:
Explanation:
Before the collision, the lorry has a momentum of:
p1 = m1v1 = 8000 kg * 20 m/s = 160000 kgm/s
where m1 is the mass of the lorry and v1 is its velocity.
The car is initially at rest, so its momentum is:
p2 = m2*v2 = 0
where m2 is the mass of the car and v2 is its velocity.
After the collision, the two vehicles move together with a common velocity v. The total momentum of the system after the collision is:
p = (m1 + m2)*v
where m1 + m2 is the total mass of the system.
By the law of conservation of momentum, the total momentum before and after the collision is the same. So we have:
p1 + p2 = p
Substituting the values we have:
160000 kg*m/s + 0 = (8000 kg + 1000 kg)*v
Simplifying:
v = (160000 kg*m/s) / (9000 kg)
v = 17.78 m/s
Therefore, the velocity of the lorry and car together after the collision is 17.78 m/s.
The planet Jupiter of mass 2x10 kg revolves around the sun of mass 2x10
kg in a circular orbit of radius 7. 8x10 m; calculate the gravitational force between
them and the orbital speed of Jupiter
The gravitational force between them and the orbital speed of Jupiter is 4.385×10^23 N and 13.081 km/s.
Mass of Jupiter, m = 2 × 10^27 kg
Mass of Sun, M = 2 × 10^30 kg
the radius of Jupiter's orbit, R = 7.8 × 10^11 m
=> distance b/w Sun and Jupiter = radius of the Jupiter's orbit = R
Gravitational force b/w them = GMm/(R^2)
= (6.67 × 10^-11)×(2 × 10^30)×( 2 × 10^27) / (7.8 × 10^11)^2
= 4.385×10^23 N
since, centripetal force = centrifugal force
=> F = GMm/(R^2) = (mv^2)/R
=> v = √(GM/R) = 13.081 km/s
Gravitational force is a fundamental force in physics that governs the interactions between massive objects. According to Newton's law of gravitation, every object in the universe exerts a gravitational force on every other object, with the strength of the force proportional to the product of their masses and inversely proportional to the square of the distance between them.
The gravitational force between two objects causes them to attract each other, with the direction of the force being along the line connecting the centers of the objects. The gravitational force is always attractive and never repulsive, and it is responsible for many phenomena in the universe, from the orbits of planets around the Sun to the motion of stars within galaxies.
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Complete Question:
The planet Jupiter of mass 2 x 1027Kg revolves around the sun of mass 2 x 10"kg in a circular orbit of radius 7.8 x 10''m. Calculate the gravitational force between them and the orbital speed of Jupiter.
A capacitor of unknown charged capacitance c is charged to 100v and the connected across an intially uncharged 60micro f capacitor. If the final potenial diffrence across the 60micro-f capacitor is 40v ,determine c
If the final potential difference across the 69micro -f then capacitor is 40Mf
We cannot expect simple energy conservation to hold because energy is presumably dissipated as heat in the connection wires or as radio waves while the charge oscillates during the system "settling down" to its final state (40V across the parallel pair of capacitors C and 60 F).
We anticipate that charge will be conserved. Thus, if Q is the initial charge stored on C and q 1 and q2 are the charges on the parallel pair after "settling down," then -
Q= q1+ q2
C(100V) = C(40V) + 60mf(40V)
C= 40Mf
An electrical component that stores electrical energy in an electric field is known as a capacitor. It is made up of two conductive plates separated by a nonconductive material known as a dielectric.
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What is the voltage drop across the tungsten filament in a 100W light bulb? The resistance of the filament is
144 Q and a current of 0.833 A is flowing through it.
The voltage drop across the tungsten filament in a 100W light bulb is 120 volts.
How to find the voltage drop across the tungsten filament ?We can use Ohm's Law to find the voltage drop across the tungsten filament:
V = I * R
Where
V is the voltage drop I is the currentR is the resistanceSubstituting the given values, we get:
V = (0.833 A) * (144 Ω)
V = 120 V
Therefore, the voltage drop across the tungsten filament in a 100W light bulb is 120 volts.
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please help thank you
Explanation:
itd D because a and b both have something to represent the answer
A packing crate of weight 50N is placed on a plane inclined at 35° from the horizontal . If the coefficient of static friction between the crate and the the plane is 0.65 , will the crate slide down the plane?
Answer:
A packing crate of weight 50N is placed on a plane inclined at 35°from the horizontal. If the coefficient of static friction between the crate and the plane is 0.65, will the crate slide down the plane? asked by Siyam February 26, 2022 1 answer normal force = m g cos 35 = 50 cos 35 = 41 Newtons so max friction force up slope = 0.65 * 41 = 26.6 N
Explanation:
A recycling center has a 0.125 m° box filled with one type of plastic. The full box has a mass of 120 kilograms. What is the density of the plastic? What type of plastic is in the box? JUSTIFY your answer.
The density of the plastic found inside the box would be = 960kg/m³
How to calculate the density of the box?The volume of the box at the recycling center= 0.125m³
The mass of the full box = 120kg
The formula use to calculate the density of the plastic = mass/volume.
That is ; Density = mass /volume = kg/m³
Density = 120/0.125
= 960kg/m³
The type of plastic that is in the box is LDPE (low density polyethylene). This is because the density calculate fell within the range of 940–960 kg/m3.
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Complete question:
A recycling center has a 0.125 m³ box filled with one type of plastic. The full box has a mass of 120 kilograms. What is the density of the plastic? What type of plastic is in the box? JUSTIFY your answer.
The gravitational potential energy of a person on a 4 m high diving board is 1800 J. What is the person's mass?
Answer:
45.9 kg
Explanation:
GPE = mgh
m = GPE / gh = (1800 J) / (9.8 m/s²)(4 m) = 45.9 kg
If the device is kept reverse biased, we know that the voltage across the device will remain roughly constant at the zener voltage. If d5 is carrying a minimum current of 5ma (down) and d6 is carrying a current of 5ma (down), what is the minimum current through r1?
The minimum current through R1 will be 10mA.
Using Ohm's Law (V = IR), we can find the minimum current through R1 as follows:
Vr1 = Vz5 + Vz6
where Vr1 is the voltage across resistor R1.
Therefore, the minimum current through R1 is:
Ir1 = Vr1 / R1
Assuming that R1 is a standard value resistor (e.g., 1kΩ), and the Zener voltages are each 5V, the voltage across R1 will be:
Vr1 = Vz5 + Vz6 = 5V + 5V = 10V
Therefore, the minimum current through R1 will be:
Ir1 = Vr1 / R1 = 10V / 1kΩ = 10mA
Current is the flow of electric charge through a conductor or material. It is defined as the rate of flow of electric charge, measured in units of amperes (A). One ampere is equivalent to the flow of one coulomb of electric charge per second.
Electric current is caused by the movement of charged particles, typically electrons, in a circuit. When a voltage is applied to a conductor, it creates an electric field that causes electrons to move through the conductor. This flow of electrons constitutes an electric current.
The direction of electric current is defined as the direction of flow of positive charges, even though the actual charges that move are electrons, which are negatively charged. Electric current can be direct current (DC), where the flow of charge is in one direction, or alternating current (AC), where the direction of flow periodically changes.
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As force increases acceleration _______________________________________________. As force decreases acceleration ________________________________________________.
The words that fill the blanks are;
increases
decreases
What is the relationship between force and acceleration?Force and acceleration are directly proportional to each other, according to Newton's second law of motion. The law states that the acceleration of an object is directly proportional to the force applied to it, and inversely proportional to its mass. Mathematically, this can be expressed as:
F = ma
where F is the force applied to an object, m is its mass, and a is its resulting acceleration.
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a 2.6 kg rock is dropped from a height of 10 m with what speed will it strike the ground ignore air resistance
Answer:
V = sqrt(2gh)
V = sqrt(2 * 9.8 * 10)
V = sqrt (196)
V = 14 m/s
Answer:
V = sqrt(2gh)
V= sqrt(29.8 10)
V = sqrt (196)
V=14 m/s
Two equal masses placed 2m apart have a gravitational attraction of 6. 7*10-9 N compute the value of the mass ( assume,g=6. 7*10-11
For the given question value of mass=20kg. The formula for gravitational attraction between two masses is:
F = G * (m1 * m2) / r^2
where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses, and r is the distance between the centers of the masses.
Given:
F = 6.7 * 10^-9 N
r = 2 m
G = 6.7 * 10^-11 N m^2 / kg^2 (gravitational constant)
Since the two masses are equal, we can write m1 = m2 = m.
Substituting the given values into the formula and solving for m, we get:
6.7 * 10^-9 N = 6.7 * 10^-11 N m^2 / kg^2 * (m^2 / (2 m)^2) * m^2
Simplifying:
6.7 * 10^-9 N = 6.7 * 10^-11 N * m^2 / 4
Multiplying both sides by 4:
m^2 = (6.7 * 10^-9 N * 4) / 6.7 * 10^-11 N
Simplifying:
m^2 = 4 * 10^2 kg
Taking the square root of both sides:
m = 20 kg
thus, each mass has a value of 20 kg.
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Select all the correct location on the image .
Which items matter
Just the phone and battery should be where they should be on the photographs.
What is the definition of a matter?The term "matter" refers to a substance that is composed of several kinds of particles, occupies space, and has inertia. The numerous kinds of particles each have a unique mass and size, according to the fundamentals of current physics. The electron, proton, and neutron are three of the most well-known instances of material particles.
Which best encapsulates matter?All objects with mass and volume are considered to be matter (takes up space). It is usually pretty easy to show that the everyday items we interact with have mass and occupy space.
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What is the wavelength of a sound wave that has a speed of 680 m/s and a frequency of 220 Hz? (With full explanation)
Answer:
3.0909 mExplanation:
Given,
Wave speed = 680 m/sfrequency = 220 HzWe need to find the wavelength of sound wave :
We know that ,
[tex]{ \underline{ \boxed{ \sf{F = \dfrac{v}{\lambda}}}}}[/tex]where,
F is frequency, v is wave speed,[tex]\sf\lambda[/tex] is wavelengthon substituting the values we get :
[tex]\dashrightarrow \sf \: 220 = \dfrac{680}{\lambda} \\ \\ \dashrightarrow \sf \: \lambda = \frac{680}{220} \\ \\ \dashrightarrow \sf \:\lambda = 3.0909 \: m\\ [/tex]
Hence,
Wavelength of sound is 3.0909 mSamples of differnt materials a and b have the same mass but the sample of a is higher in density which statement could explain why this is so
The constituent particles of material A are heavier than those of material B.
Why density differ -A material with smaller, more heavy, and closely spaced atoms will have a higher density. A substance's density will decrease if its bigger, lighter atoms are separated from one another more widely.
The densities of solids, liquids, and gases are determined by the separations between the particles in each state of matter.
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help as soon u can pls! due in 45 mins!!
Which statement correctly represents a mineral?
1. any naturally forming substance made from one element
2. any chemical substance which forms naturally in the Earth
3. an element which is made into an object
4. any substance which develops in the ground
Minerals are any chemical substance which forms naturally in the Earth
Define mineral.
Minerals are those substances found in foods and in the earth that our systems require for healthy growth and development. Calcium, phosphate, potassium, sodium, chloride, magnesium, iron, zinc, iodine, chromium, copper, fluoride, molybdenum, manganese, and selenium are among the nutrients that are crucial for good health.
Compounds found only in living creatures are typically not considered minerals according to geological definitions. However, some minerals, like calcite, are frequently biogenic or, in terms of chemistry, are organic molecules (such as mellite). Additionally, living things frequently produce inorganic crystals (like hydroxylapatite), which are also found in rocks.
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A person who weighs 50 N climbs 100 stairs up. Each stair is 0.2 m high. The work done is
Answer:
Explanation:
Given that ,
A man who weights is 50N climbs up 100 steps of a stair
each step is 0.2m high
mg=50N
Height at 100 steps , h=100×0.2=50 m
Change in potential energy , =mgh=50×50=2500 J
So, Work done by the man , W=2500 J
A University of Rochester student decided to depart from Earth after his graduation to find work on Mars. Before building a shuttle, he conducted careful calculations. A model for the velocity of the shuttle, from liftoff at t=0 s until the solid rocket boosters were jettisoned at t = 46 s, is given
by
v(t) = 0.001832667³0.082592 +34.52t - 5.65
Using the model, estimate (in feet per second)
The absolute maximum value ____
The absolute minimum value ____
Using the model, the absolute maximum value of acceleration is 21.698 m/s² and the absolute minimum value of acceleration is 14.597 m/s² between liftoff and the jettisoning of the solid rocket boosters.
What are solid rocket boosters?Solid rocket boosters (SRBs) are large rocket engines used to provide the majority of the thrust required for a spacecraft during its initial launch phase. They are called “solid” because they contain solid propellant, that burns at a controlled rate to produce thrust.
In the given problem:
We know,
v(t)=0.001500000t³-0.08t²+16.02t-2.37
Acceleration will be derivative of velocity
Hence, a=dv/dt=0.0045t2-0.16t+16.02
at t=0,a=16.02 m/s²
Now the maximum acceleration will be at endpoint i.e., t=57.5s
so at t=57.5 s, a=21.698 m/s²
For minimum acceleration, a'(t)= 0.009t-0.16<0
t<17.77
Minimum acceleration will be at t=17.77 s, a(t)=14.597 m/s²
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The question is incomplete, but most probably the complete question is,
A University of Rochester student decided to depart from Earth after his graduation to find work on Mars. Before building a shuttle, he conducted careful calculations. A model for the velocity of the shuttle, from liftoff at t = 0 s until the solid rocket boosters were jettisoned at t = 57.5 s, is given by (in feet per second). Using this model, estimate:
the absolute maximum value = ??
and absolute minimum value - ??
of the ACCELERATION of the shuttle between liftoff and the jettisoning of the boosters.
An Atwood's machine consists of two masses, m and M2, which are connected by a massless inelastic cord that passes over a pulley, Fig. 8-47. If the pulley has radius R and moment of inertia I about its axle, determine the acceleration of the masses mi and m2, and compare to the situation in which the moment of inertia of the pulley is ignored. [Hint: The tensions Fri and Fm are not
Fr
equal. We discussed this situation in Example 4-13, assuming
I = 0 for the
The expression for the acceleration is the same in both cases, indicating that the moment of inertia of the pulley does not affect the acceleration of the masses.
An Atwood's machine consists of two masses connected by a rope that passes over a pulley. The acceleration of the masses can be found by applying Newton's second law to each mass separately. The force due to gravity and the tension in the rope are the only forces acting on the masses.
If we consider the moment of inertia of the pulley, the acceleration can be found using the net forces on each mass. However, if we ignore the moment of inertia of the pulley, the acceleration can be found using the net force on the system. However, the expression for the acceleration is the same in both cases, meaning that the moment of inertia of the pulley does not affect the acceleration of the masses.
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The figure shows two wave pulses that are
approaching each other.
Which of the following best shows the shape
of the resultant pulse when the centers of the
pulses, points P and Q, coincide?
Option 3 shows the shape of the resultant pulse when the centers of the
pulses, points P and Q, coincide.
What is a pulse of a wave?
A pulse of a wave is a single disturbance or vibration that travels through a medium, carrying energy without permanently displacing the medium. It is a type of wave that is characterized by a single disturbance or oscillation that travels through a medium, such as air or water, and creates a temporary disturbance in the medium's equilibrium. A wave pulse can be described by its amplitude (the height of the disturbance), its wavelength (the distance between successive peaks or troughs), and its speed (the rate at which the disturbance travels through the medium).
Q's crest amplitude = Q's Trough amplitude= P's Crest amplitude
and P's wavelength = Q's wavelength
then when you lay them on top of each other
Q's crest combines in phase with the first half of P's crest and they double where as
Q's trough combines out of phase with the second half of P's crest and they negate each other
resulting in something that looks like choice 3
Therefore, Option 3 is the correct answer.
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The cooling system of a laser system fails. As a result, 64 kcal of heat are absorbed each minute by the laser rod in the laser system. The laser rod has a mass of 5 kg. It has a specific heat of 0. 3 kcal/kg • Co.
Find: How much the temperature of the rod increases each minute, in 0C
The temperature of the laser rod increases by 21.33 degrees Celsius each minute due to the failure of the cooling system.
When heat is transferred to an object, its temperature increases. The amount of temperature increase depends on the amount of heat transferred, the mass of the object, and its specific heat.
To calculate the temperature increase of the laser rod, we can use the formula:
ΔT = Q / (m * c)
where ΔT is the change in temperature, Q is the heat absorbed, m is the mass of the laser rod, and c is the specific heat of the material.
In our case, the laser rod is a closed system, and the heat added is 64 kcal per minute.
Substituting the given values, we get:
ΔT = 64 kcal / (5 kg * 0.3 kcal/kg•Co)
ΔT = 21.33 Co
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Dispersion of light by a prism is due to the change in ______
a) frequency of light
b) speed of light
c) scattering
d) none of these
Answer:
(b) the speed of light depends on the index of refraction of the medium thru which it is traveling - different colors have different indices of refraction and are refracted at different angles
A body is found at 9:30pm. The temperature of the liver registers 84.6F what is the approximate TOD of the victim
The approximate TOD of the victim is Maybe around 4:30 pm.
How can you gauge the temperature of your liver?The liver temperature can provide a more accurate representation of the genuine core body temperature, hence it is ideal to take the temperature either rectally or by monitoring the liver temperature.To do this, a tiny incision must be made in the right upper belly, and the thermometer must be inserted into the liver tissue.
How is the death date determined?This stiffening process, known as rigor mortis, occurs at a fairly known time, making it possible to predict when someone will pass away.In overall: If the body is warm and there is no rigidity, the time of death was less than three hours ago.If the body is stiff and warm, death happened 3 to 8 hours earlier.
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An excited physic student is in a cart rolling down a hill at 12 m/s If the cart and student have a combined kinetic energy of 4896 J, what is the mass of the student and cart combined?
Answer:
17.0 kg
Explanation:
The kinetic energy (KE) of the system can be expressed as:
KE = (1/2)mv^2
where m is the mass of the cart and student combined, and v is the velocity of the cart.
We know that KE = 4896 J and v = 12 m/s. We can rearrange the equation to solve for m:
m = 2KE/v^2
m = 2(4896 J) / (12 m/s)^2
m = 17.0 kg
Therefore, the mass of the student and cart combined is 17.0 kg.
Lubricants reduce friction by replacing sliding friction with fluid friction.
True or False
Answer:
true
Explanation:
By adding a thin layer of oil or even water between two objects, you convert the sliding friction to fluid friction.
DESPERATE HELP. 80 POINTS. PLEASE PHYSICS
HELP ASAP
Discuss how the government uses tax credits, direct payments, and deficiency payments to
subsidize renewable energy.
For eligible renewable energy technology and projects, a number of tax credits, grants, and loan programmes are offered by the federal government.
Why does the government promote the use of renewable energy sources?Fossil fuels are burned to produce energy, which produces a sizable amount of greenhouse gas emissions that contribute to global warming. Even when taking into account the entire life cycle of the technologies, the majority of renewable energy sources produce negligible to no emissions.
Why are subsidies for renewable energy good?Subsidies have helped reduce dependency on fossil fuels by expanding the use of renewable energy sources. This is crucial for lowering greenhouse gas emissions and preventing an increase in global temperatures.
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What is the SI unit for mass? Give the full name, not the symbol.
Give your answer.
Answer: The kilogram, symbol kg, is the SI unit of mass.
Explanation: It is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10-34 when expressed in the unit J s, which is equal to kg m2 s-1, where the meter and the second are defined in terms of c and ΔνCs.
Answer: The answer is kilogram (kg)
Explanation:
The two elements will bond or not bond into one ratio
Ionic compounds can be created when elements from Groups 1 and 17 mix one to one ratio.
To create ionic compounds, group 1 and group 17 elements can combine one to one.
In addition, group 8A (or VIIIA) of the periodic table contains the noble gases or inert gases helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon. As a result, if any elements from this group are present, they will not bond (Rn).
The name of these elements refers to how little they react with other elements or compounds. An example of bonding is, when carbon and oxygen atoms join in a 1:2 ratio, carbon dioxide is produced; when they combine in a 1:1 ratio, carbon monoxide, or CO, is produced.
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In your opinion, Is the big bang theory a valid explanation for the beginning of time?
If so, what areas of research do you think has the greatest possibly for more discovery?
If not, what problems in the theory leads you to reject it? What might be an alternate theory?
(please give me a good long well thought out answer)
Answer:
I believe that the Big Bang Theory is a valid explanation for the beginning of time. Areas of research that have the greatest potential for more discovery include dark matter and dark energy, the nature of the inflationary period, and the origin of the matter-antimatter asymmetry.
Problems with the Big Bang Theory that lead me to reject it include the lack of a satisfactory explanation for the origin of the initial conditions of the universe, the lack of a satisfactory explanation for the origin of the matter-antimatter asymmetry, and the lack of a satisfactory explanation for the origin of the inflationary period. An alternate theory could be the Cyclic Universe Theory, which proposes that the universe goes through an infinite cycle of expansion and contraction.
The center grinds up plastic for recycling, but the workers forgot to label the type of plastic. The workers found that the plastic has a mass of 2.25 g and a volume of 2.5 cm. What is the density of the plastic? What type of plastic was it? JUSTIFY your answer.
Density of the plastic is 0.9 g/cm³.
The type of plastic collected are yogurt cups and plasticwares.
What is density of a substance?Density of a substance is defined as the mass per unit volume of the substance.
Here,
Mass of the plastic, m = 2.2 g
Volume of the plastic, V = 2.5 cm³
So, density, ρ = m/V
ρ = 2.25/2.5
ρ = 0.9 g/cm³
Recyclable plastics are sorted on the basis of their densities. Here, the density of the collected plastic is 0.9 g/cm³. So, the plastic material must be yogurt cups and plasticwares.
Hence,
Density of the plastic is 0.9 g/cm³.
The type of plastic collected are yogurt cups and plasticwares.
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