L 6.3.2 Test (CST): Applications of Waves Question 5 of 10 Which event provides evidence that matter can reflect waves? O A. An audience member covers her ears during a loud concert. B. A laser beam bounces off a series of mirrors. C. A performer makes shadow puppets on a wall. D. The light from a fireworks show is seen miles away. ​

Answer:

100 m / s^

F =ma from this divided F and ma by m to get acceleration

a = F / m

a = ?

F = 5 N

m = 50 g = 0. 0 5 kg ; if 1 kg = 1000g how much kg of 50 g by criss cross method we get 0.05 kg

so; 5N / 0. 05 kg = 5kg m / s^ / 0.05 kg

kg cancel by kg

the result is 100 m/ s^

Answer:

False

Explanation:

Scientific models are not always built to scale and may not be fully accurate

The gravitational force will decrease when we increase the distance between the objects and decrease the mass of both objects.

The factors affecting gravitational force are the masses of the objects and the distance separating the objects.

The gravitational force increases with increase in mass and decreases with increase in distance of separation and vice versa.

Therefore, the gravitational force will decrease when we increase the distance between the objects and decrease the mass of both objects.

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Explanation:

s = ?           u = 0m/s        v = ?         a = 5m/s²        t = 2s

v = u + at                  

  = 0 + (5 x 2)              

  = 10 m/s                    

s = ut + 1/2 at²

= (0)(2) +  x    [tex]\frac{1}{2}[/tex]  x 5 x 2²

= 10 m

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Answer:

B. The law of conservation of energy

Explanation:

The law of conservation of energy states that energy can neither be created or destroyed which means that a perpetual motion machine, which creates its own power and energy, cannot be true since energy cannot be created.

The procedure is not found here but a chemical reaction is characterized to be a process where substances are converted into products.

A chemical reaction is a process where one or more reactants are converted into chemical products.

In a chemical reaction, enzymes are molecules that speed up the process by lowering its activation energy.

In conclusion, the procedure is not found here but a chemical reaction is characterized to be a process where substances are converted into products.

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Higher resolution cannot be achieved with a light microscope because wavelength of light is larger that wavelength of electrons.

Light microscope is defined as the type of microscope that makes use of visible light to magnify objects into images that can be observed.

The wavelength of light is larger than that of the electrons, therefore, higher resolution cannot be achieved with a light microscope.

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Based on the efficiency of the airblower of 62%, power generated by the airblower is 330.5 W.

Efficiency of a machine is a ratio of the work output and the work input of a machine.

The power generated by the airblower = ?

Power input to th air blower = 533 W

Efficiency = 0.62 or 62 %

Power generated by the airblower = Efficiency × work input/100

Power generated by the airblower = 62 × 533/100 = 330.5 W

Therefore, the power generated by the airblower is 330.5 W.

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The solar system is smaller than a galaxy. Galaxies are composed of solar systems. The solar system is composed of planets revolving around a star (such as our sun). To put into perspective, there are about hundreds of billions of stars in our galaxy (the milky way). On the other hand, billions of galaxies make up the universe.

The speed of light is constant which is 299 792 458 m / s. The time is taken for light to reach an object can be used to measure the distance between objects in space. This is done by multiplying the time by the speed of light.

Distance in space is so vast and therefore impractical to use the basic SI units of meters and kilometers we use here on earth. Therefore the use of astronomical units and light years is used. Light years is the distance that light can cover in a year in the vacuum of space, while astronomical units is the distance between solar systems.

The velocity of the mass after the force has stopped acting is 14 m/s.

The velocity of an object is the speed at which the object is moving in a specified direction.

Momentum is related to velocity and mass by the formula:

The velocity of the mass after 8 seconds is first determined.

Change in linear momentum = (1/2 × 2 × 6) + (6 × 4) + (1/3 ×2 × 6) = 36 kgm/s

Initial momentum = 18 kg × 12 m/s = 216 kgm/s

Final momentum = 216 + 36 = 252 kgm/s

Final Velocity = final momentum/mass

Velocity = 252/18 = 14 m/s

After 8 seconds, the force stops acting.

Therefore, the velocity of the mass after the force has stopped acting is 14 m/s.

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Answer:

ultraviolet radiation

To refine minerals best describes the purpose of the process mentioned and is denoted as option B.

Thi involves the different processes involved in the purification of the elements found in the earth.

Refining materials usually starts with crushing and ends with dewatering to drain water.

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The safest option in the lab if one need your vision to be corrected is  wear corrective glasses or lenses under your safety goggles for the whole experiment, but always check with your ta or instructor for your school's policy.

When someone is performing any project in the chemistry lab, he needs to be extra care taken by himself and and the most importantly from the school. The safety goggles are used to protect the eyes from any spiling off the chemical.

One should wear corrective glasses under the safety goggles during the whole experiment.

Thus, wear corrective glasses under the safety goggles during the whole experiment.

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The time of motion of the ball before coming to rest is  determined as 5.5 s.

The time of motion of the ball before coming to rest is calculated as follows;

v = u + at

when the ball comes to rest, v = 0

0 = u + at

0 = 55 + (-10)t

0 = 55 - 10t

10t = 55

t = 5.5s

Thus, the time of motion of the ball before coming to rest is 5.5 s.

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From the principle of energy conservation, the kinetic energy of the pendulum at 0.5 m is 14.7 J.

A pendulum swings back and forth and can be used to show the change of potential energy to kinetic energy and vice versa.

Given that the kinetic energy is converted to the potential energy; the potential energy at 0.5 m is 3 * 9.8 * 0.5 = 14.7 J.

Following the principle of energy conservation, the kinetic energy of the pendulum at 0.5 m is 14.7 J.

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Answer:

throwing a ball

Explanation:

because when we throw the ball we apply force so that the ball goes faster

The particles in the reaction system have more kinetic energy than the surroundings.

Exothermic reaction is a type of reaction in which energy is lost to the environment.

Internal energy (E) = kinetic energy (K.E) + potential energy (P.E)

Change in internal energy (ΔE) = K.E (particles) - K.E (surroundings)

Since energy is lost to the environment, we can conclude that the particles in the reaction system have more kinetic energy than the surroundings.

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The statement indicating that 'Gravitation always does negative work' is FALSE.

Gravitation is a fundamental physical force that makes objects attract each other in the Universe.

This force (Gravitation) is required to maintain both constant positions and movement of objects.

In conclusion, the statement indicating that 'Gravitation always does negative work' is FALSE.

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Answer:false

Explanation:

A manufacturer supplies plastic cups that are placed under the legs of the chair. The manufacturer's claim is that there will be no marks of chair due to pushing or pulling on the floor.

A manufacturer is a person who converts his idea of developing and constructing any item using some set of machines.

A manufacturer supplies plastic cups that are placed under the legs of the chair.

When there is a relative motion between two objects, friction force causes the opposition to this motion. Between chair and floor, there will be high magnitude of force. But if we insert plastic cups in the legs of chair, then the friction between cup and floor will be less. This keeps the floor protected form any scratches.

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The decrease in kinetic energy during collision is 0.171 joule. Hence, option (D) is correct.

The energy an object has as a result of motion is known as kinetic energy in physics. It is described as the effort required to move a mass-determined body from rest to the indicated velocity.

The body holds onto the kinetic energy it acquired during its acceleration until its speed changes. The body exerts the same amount of effort when slowing down from its current pace to a condition of rest.

Hence, the decrease in kinetic energy during collision =

Total initial kinetic energy - total final kinetic energy

= {1/2 × 1.15 ×(1.05)² + 1/2 ×2.25 × 0² - (1/2 × 1.15 × 0.13² + 1/2 ×1.25 × 0.85²)} Joule

= { 0.633 + 0 - 0.010 - 0.452} joule

= 0.171 joule.

Hence, The decrease in kinetic energy during collision is 0.171 joule.

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The second diver have to leap to make a competitive splash by 4.08 m high.

The energy by virtue of its position is called the potential energy.

PE = mgh

where, g = 9.81 m/s²

Given is the diver jumps from a 3.00-m platform. one diver has a mass of 136 kg and simply steps off the platform. another diver has a mass of 100 kg and leaps upward from the platform.

The potential energy of the first diver must be equal to the second diver.

P.E₁ = P.E₂

m₁gh₁ = m₂gh₂

Substitute the vales, we have

136 x 3  = 100 x h₂

h₂ = ₂4.08 m

Thus, the second diver need to leap by 4.08 m high.

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Exercise is a vigorous activity that tends to help us to burn calories and loose weight in the process.

Exercise is a vigorous activity that tends to help us to burn calories and loose weight in the process. There is no quick way to loose weight because the calories were added on gradually and must also be lost gradually.

Before and after photos does not show the loss in calories. This can only be determined by measurement.

Before you buy exercise equipment;

An example of an exercise equipment is a stationary bicycle. It works when you sit or stand on it and cycle repeatedly though it doesn't move. I am skeptical about it because it may not help you burn a lot of calories except you use it for long periods of time.

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The magnitude of the angular momentum of the two-satellite system is best represented as, L=m₁v₁r₁-m₂v₂r₂.

The rotational analog of linear momentum is angular momentum also known as moment of momentum or rotational momentum.

It is significant in physics because it is a conserved quantity. the total angular momentum of a closed system remains constant. Both the direction and magnitude of angular momentum are conserved.

The magnitude of the angular momentum of the two-satellite system is best represented as;

L=∑mvr

L=m₁v₁r₁-m₂v₂r₂

Hence, the magnitude of the angular momentum of the two-satellite system is best represented as, L=m₁v₁r₁-m₂v₂r₂.

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[tex]\text{Weight,}~ \\\\W = mg = 45 \times 9.8 = 441~ N\\\\\text{The weight of the object on earth is 441 N}.[/tex]

The type of model used is most likely to be conceptual because it shows the relationship between cause and effect.

A simulation can be defined as a model which is designed and developed to imitate the operation of an existing (proposed) real-life system or natural phenomenon, so as to enhance the ability to study, analyze, and make informed decisions about it.

Generally, there are different types of simulation and these include the following:

In this scenario, the simulation which shows whether changing various weather conditions increases the likelihood that a hurricane will form is missing.

Thus, I would infer that the type of model used is most likely to be conceptual because it shows the relationship between cause and effect.

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Answer:

The triboelectric effect is an electrical phenomenon where certain materials become electrically charged after coming into contact with another, different, material. The polarity and strength of the charges produced differ according to material and surface smoothness.

Explanation:

The triboelectric effect causes an electrostatic charge to build up on the fur due to the cat's motions. The electric field of the charges results in a slight attraction of the light plastic pieces to the charged fur. The triboelectric effect is also the cause of static cling in clothes.

I hope this helps, if it doesn't then just message me and ill be more than happy to help :)