PHYSICS MIDDLE SCHOOL

Is velocity related to momentum

Answers

Answer 1
Answer: yes
momentum=mass x velocity
or you could rearrange the formula to find velocity = momentum/mass (you get this by dividing both sides in the original equation by mass)
you could also get that mass= momentum/velocity (you get this by rearranging both sides of the original equation by velocity) 
Answer 2
Answer: Yes momentum is expressed as mass * velocity:

p = m * v

p: momentum
m: mass
v: velocity

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15 POINTS! What are some differences and similarities between Electromagnetic and Mechanical waves?

Answers

Elecromagnetic waves can travel through a vacuum, but a mechanical wave cannot.Mechanical waves can only exist in a medium, such as air or water. Electromagneticwaves behave like waves and particles, but mechanical waves only behavelike waves.

A box weighing 100 newtons is pushed up an inclined plane that is 5 meters long. It takes a force of 75 newtons to push it to the top, which has a height of 3 meters. What is the efficiency?

Answers

the efficiency is 575 newtons 

What is the difference between chemical and physical changes

Answers

There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.
There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

Please explain the method of making electricity from non renewable sources like coal?

Answers

the coal is  urned to heat up water. this produces steam. the steam turns a turbine that turns a generator which provided energy yhat can be transferred into electrisity

Please help fast science homework

Answers

Answer:

The solar cells transfer light energy to thermal energy.

When the battery is being charged up, chemical energy is transferred to electrical energy.

The motor is designed to transfer potential energy to kinetic energy.

A teacher listed the following two processes.• Process 1: water changing to ice in a refrigerator
• Process 2: steam coming out of a kettle filled with hot of water

Which table correctly identifies the change of state taking place in each example?
A)
Process Phase Change
1 Liquid to gas
2 Liquid to gas
B)
Process Phase Change
1 Liquid to gas
2 Liquid to solid
C)
Process Phase Change
1 Liquid to gas
2 Gas to Liquid
D)
Process Phase Change
1 Liquid to solid
2 Liquid to gas

Answers

The answer is D because water changing to ice is liquid to solid and water turning to gas is liquid to gas.
so we know that water is a liquid, ice is a solid (block) and steam is a gas. With this information, change out the process and see which is true (I will check your answer if you comment below)
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