The weight of the crate moved vertically is 40.9 Newton.
What is the weight of the crate?To solve this problem, we can use the formula for work done, which is:
Work done = force × displacement
Where force is the weight of the crate, distance is the vertical distance moved.
We can rearrange the formula to solve for the weight of the crate:
Force = work / displacement
Given that;
Work done = 450 JDisplacement = 11 m.Plugging in the values, we get:
Force = work / displacement
Force = 450 J / (11 m )
Force = 40.9 N
Therefore, the weight of the crate is 40.9 N.
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The table below is missing its headings. Based upon the descriptions provided, what should "Column B be renamed?
Column A
Column B
Transverse
Transverse or Longitudinal
Does not require a medium to travel. Requires a medium to travel.
Includes visible light
Includes sound.
O Transverse Waves
O Mechanical Waves
O Electromagnetic Waves
O Longitudinal Waves
Column B should be renamed as Mechanical waves.
What are the differences between transverse and longitudinal waves ?Transverse waves require medium to travel while longitudinal waves doesn't require a medium.
Transverse waves can be polarized while longitudinal waves cannot be polarized.
Transverse waves consists of crests and troughs while longitudinal waves consists of compressions and rarefactions.
Here,
In column B include waves that could be both transverse and longitudinal and requires a medium to travel and also it includes sound. So these are the properties of mechanical waves.
Hence,
Column B should be renamed as Mechanical waves.
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A ball of mass 20 g moving at 10 m s¹ horizontally collides with another ball of mass 40 g that is at rest. After collision the 20 g ball has a velocity of 4 m s at an angle of 50° relative to its original direction. Calculate the total change in kinetic energy of the system. A. 1.21 x 10-21 B. -121 x 10-21 C. 112 x 10-2 D. 815 x 102 E. -518 x 10-1
Answer:
We can use conservation of momentum and conservation of energy to solve this problem.
Conservation of momentum:
Initial momentum = final momentum
m1v1 + m2v2 = (m1 + m2)v'
where m1 = 20 g = 0.02 kg, v1 = 10 m/s, m2 = 40 g = 0.04 kg, v2 = 0, v' is the final velocity of both balls after collision.
Solving for v':
v' = (m1v1 + m2v2)/(m1 + m2)
v' = (0.02 x 10 + 0.04 x 0)/(0.02 + 0.04)
v' = 6.67 m/s
Conservation of energy:
Initial kinetic energy = final kinetic energy
(1/2)m1v1^2 + (1/2)m2v2^2 = (1/2)(m1 + m2)v'^2
where v' is the final velocity calculated from conservation of momentum.
Solving for the total change in kinetic energy:
ΔKE = (1/2)(m1v1^2 + m2v2^2) - (1/2)(m1 + m2)v'^2
ΔKE = (1/2)(0.02 x 10^2 + 0.04 x 0^2) - (1/2)(0.02 + 0.04) x 6.67^2
ΔKE = -0.518 J
Therefore, the answer is (E) -518 x 10^-1.
Answer the following mcq
The reason for the deflection of the compass from the magnetic north of the Earth when a current-carrying wire is placed over Magnetic effect due to current carrying wire.
What is Magnetic effect ?
Magnetic effect refers to the influence that a magnet or a magnetic field has on other magnets, magnetic materials, or moving charges. This effect is a result of the physical properties of magnetic fields, which are created by moving charges, such as electrons.
The magnetic effect is responsible for various phenomena, including the attraction or repulsion of magnets, the creation of magnetic fields around current-carrying wires, the behavior of moving charges in a magnetic field, and the generation of electricity in electric generators.
The reason for the deflection of the compass from the magnetic north of the Earth when a current-carrying wire is placed over it is option (a) - Magnetic effect due to current carrying wire.
When a current flows through a wire, it creates a magnetic field around the wire. This magnetic field can interact with the magnetic field of the Earth, causing the compass needle to deflect from its original direction. This phenomenon is known as the magnetic effect of a current-carrying wire.
Therefore, she action of connecting a battery to the wire and placing it over the compass caused a current to flow through the wire, which in turn created a magnetic field around the wire, leading to the deflection of the compass needle.
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9. Because water consists of polar molecules, ___.
A. Water falls as sleet or snow when temperatures are cold.
B. Water can be attracted using a magnet
C. Water is attracted to the magnet north pole
D. Water molecules tend to stick together
Answer:
D water molecules tend to stick together.
Explanation:
a water molecule consists of 1 oxygen atom and 2 hydrogen atoms. because of the oxygen atom, this makes water electronegative, giving the hydrogen side a partial charge and the oxygen side a partial negative charge, making the water molecule polar. the oxygen is attracted to hydrogens, and the hydrogens are attracted to oxygens creating hydrogen bonds. hence the answer is D the water molecules tend to stick together.
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
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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Can someone help me with these? Thanks!
Solve the following vector problems
8. A ship's maximum speed is 22km/hr to the South, What is its speed if there is also a current of 3km/hr to the South?
9. A ship's maximum speed is 22km/hr to the South, What is its speed if there is also a current of 3km/hr to the North?
10. What is your displacement if you travel 50m to the right, and then return 20 meters to the left?
11. What is your displacement if you drive 2 km North, then 4 km East, then 2 km South, and finally 4 km West?
The ship's speed relative to the ground is 25 km/hr to the South.
The displacement is zero, which means that the final position is the same as the initial position. The movements to the North and South cancel out, and the movements to the East and West cancel out.
What is velocity?Velocity is a vector quantity that describes the rate at which an object's position changes over time.In other words, velocity is an object's speed in a specific direction. The velocity of an object is typically represented by a vector, which has both magnitude (the speed of the object) and direction.
The ship's speed relative to the water is 22 km/hr to the South. If there is a current of 3 km/hr to the South, the ship's speed relative to the ground is the vector sum of its speed relative to the water and the velocity of the current. Since the two velocities are in the same direction, we can simply add them to get:
velocity relative to the ground = 22 km/hr to the South + 3 km/hr to the South = 25 km/hr to the South.
Therefore, the ship's speed relative to the ground is 25 km/hr to the South.
Similar to the previous problem, the ship's speed relative to the ground is the vector sum of its speed relative to the water and the velocity of the current. However, this time the current is going in the opposite direction, so we need to subtract the velocity of the current from the ship's speed relative to the water:
velocity relative to the ground = 22 km/hr to the South - 3 km/hr to the North = 22 km/hr to the South + 3 km/hr to the South = 25 km/hr to the South.
Therefore, the ship's speed relative to the ground is 25 km/hr to the South.
The displacement is characterized by the difference between the final and initial positions. In this case, the initial position and the final position are the same, so the displacement is zero. We can represent the two movements using vectors:
50 m to the right = +50 m i
20 m to the left = -20 m i
The displacement vector is the vector sum of these two vectors:
displacement = +50 m i - 20 m i = +30 m i
Since the x-component of the displacement vector is positive, the displacement is to the right.
We can represent the four movements using vectors:
2 km North = +2 km j
4 km East = +4 km i
2 km South = -2 km j
4 km West = -4 km i
The displacement vector is the vector sum of these four vectors:
displacement = +2 km j + 4 km i - 2 km j - 4 km i = 0 km i + 0 km j
Therefore, the displacement is zero, which means that the final position is the same as the initial position. The movements to the North and South cancel out, and the movements to the East and West cancel out.
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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
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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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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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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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 mThe 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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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.
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:
Identify the direction of net force. A car is driving across a flat roas ,assume no air resistance
Assuming the car is driving across a flat road with no air resistance, the direction of net force acting on the car will depend on the direction of the car's motion and the forces acting on it.
If the car is traveling at a constant velocity, then the net force acting on it is zero. This is because the forces acting on the car - such as the force of the engine, friction from the tires, and air resistance - are balanced and cancel each other out. However, if the car is accelerating or decelerating, then there is a net force acting on it. For example, if the car is accelerating forward, then the net force acting on it is in the forward direction. This is because the force of the engine pushing the car forward is greater than the opposing forces, such as air resistance and friction. Similarly, if the car is decelerating, then the net force acting on it is in the opposite direction of its motion. This is because the opposing forces are greater than the force of the engine, causing the car to slow down.
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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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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.
What is the wavelength of the longest wavelength standing wave pattern that can fit on this guitar string? standing waves on a guitar string form when waves traveling down the string reflect off a point where the string is tied down or pressed against the fingerboard. The entire series of distortions may be superimposed on a single figure, like this (figure 2), indicating different moments in time using traces of different colors or line styles. Part ab
The wavelength of the standing wave λ = 40cm
What is a Wavelength?A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in consecutive cycles.
Its length is typically defined in wireless systems in meters (m), centimeters (cm), or millimeters (mm) (mm).
How to solve:
We know the distance between two successive nodes = λ / 2
From the figure distance between two successive nodes = 20 cm
i.e. λ / 2 = 20 cm
∴ The wavelength of the standing wave λ = 40cm
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Samples 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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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:
DESPERATE HELP. 80 POINTS. PLEASE PHYSICS
A force is applied to a 1 kg mass and produces
4.1 m/s
2
acceleration.
What acceleration would be produced by
the same force applied to a 13.4 kg mass?
Answer in units of m/s
2
.
The 2.4 m/s² acceleration would be produced by the same force applied to a 13.4 kg mass.
What is acceleration ?
The pace at which speed changes is known as acceleration. Acceleration typically, but not always, indicates a change in speed. Because the direction of an object's velocity is shifting even while it follows a circular course, it continues to accelerate.
What is force?
A body can change its state of rest or motion when an external force acts on it. It is directed and has a magnitude.
As we know that force= mass × acceleration
So F₁=m₁×4
F₂=m₂×6
now for combined system total acceleration will be "a"= F/ m₁+m₂
m₁= F/4
m₂= F/6
so put the value of m₁ and m₂
Therefore, 2.4 m/s² acceleration would be produced by the same force applied to a 13.4 kg mass.
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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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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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What will happen to the velocity and momentum of each ball when the small ball hits the heavier large ball?
Answer:
it will stop
Explanation:
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.
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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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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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