PHYSICS MIDDLE SCHOOL

Help me pleaseee...A 200kg piano sitting on a platform 2 m high has 3920 J off potential energy. It required 4500 J of work to push the piano up a ramp to the platform. What is the best explanation for the difference between the amount of work required to move the piano and its potential energy?
A) the piano lost mass as it was pushed up the ramp.
B) energy was destroyed moving the piano up the ramp.
C) some of the energy required to push the piano up the ramp was used to overcome friction between the piano and the ramp.
D) the work required to push the piano up a ramp is greater because the force is the same as if it were lifted, but the distance is greater when using a ramp.

Answers

Answer 1
Answer:

Answer:

c

Explanation:
Answer 2
Answer:

Answer:

C) some of the energy required to push the piano up the ramp was used to overcome friction between the piano and the ramp.

Explanation:

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One chef places a pie in the oven at a low setting so that it is baked in one hour. Another chief place a pie in the oven at a high setting so that the pie bakes in 30 minutes. Is the amount of energy the same in each case? Is the power the same?

Answers

In each case, (the pie in a low setting at one hour versus the pie in a high setting at thirty minutes) the amount of energy is the same. However, the amount of power is different. Since power is the amount of work put in certain amount of time, the power in the high setting is larger compared to the power in the low setting. 

Explain why atmospheric pressure changes as atmospheric depth changes.

Answers

the lower you go in relation to the top of the atmosphere the larger the column of air is that is pressing down on you. 

Answer:

The force of the collisions creates pressure on the container. ... Explain why atmospheric pressure changes as depth changes. Atmospheric pressure increases as depth increases because at lower levels of the atmosphere, there is more air above that is being pulled down by gravitational force.

Explanation:

Name two ways to reduce friction and two ways to increase it.

Answers

Ways to increase friction 

- increase the roughness of the contact materials 
- increase the pressure on the contact 


Ways to decrease friction 

- float the moving body on air 
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Warm blooded or cold blooded Animals are warm when their surroundings are warm and cool when their surroundings

Answers

Your answer should be Cold Blooded Animals. Cold blooded animals don't have control over their own body temperature like humans or mammals do, most times cold blooded animals are reptiles, amphibians, etc. so they have to lay on rocks or someplace in the sunlight to warm up and have to go to water or shady areas to cool off. Hope this helps! =^-^=
Cold blooded animals

What makes the planets gravity?

Answers

The presence of mass makes gravity. Doesn't matter whether it's a planet, a black hole, a puppy, or a speck of dust.

All of the following help to reduce the problem of social traps except ___________. Please select the best answer from the choices provided modelilng altruistic behaviors educating individuals about the effects of social traps establishing laws that decrease cooperative behavior establishing regulations on behaviors that have collective effectsIT WAS C

Answers

Answer:

Establishing laws that decrease cooperative behaviour.

Explanation:

A social trap refers to short term benefits, but long terms loss in a certain social group, that's why is called trap. One good example of social trap could be overexploitation of resources. Our societies is inside this social trap, which help to develop the economy, but with a long term ecology costs, because it degrades complete ecosystems.

So, in this case, the only answer that don't contribute to reduce this social problem, it's "establishing laws that decrease cooperative behaviour", because the lack of cooperativeness is one way to ensure the perpetuation and development of social traps.

All other options, actually contributes to reduce this social phenomenon. Modelling altruistic behaviours, education, and regulations on behaviour which could impact collectives, all of these are positive decisions that improve our social intelligence, and could ensure the reduce of social traps.
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