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Physics
OpenStudy (lifeisadangerousgame):

Imagine you are riding a roller-coaster. It has chugged up the first hill and has come to a stop at the very top (see arrow). At this moment, which is higher, your potential energy or your kinetic energy?

OpenStudy (experimentx):

if the roller coaster is almost stopped, the obviously the kinetic energy is almost zero. but on rising height, the potential energy increase. therefore, potential energy is higher.

OpenStudy (lifeisadangerousgame):

Thank you! Could you help me with some of the other ones too?

OpenStudy (lifeisadangerousgame):

A toy train has a mass of 2 kg and travels at a rate of 1.5 m/s. How much kinetic energy does it have when it's in motion? I think the answer is 3.0 J?

OpenStudy (experimentx):

1/2*2*1.5^2 = 2.25J

OpenStudy (lifeisadangerousgame):

Thank you! I have one more: How much potential energy does a 3 kg can of paint have when it is placed on top of a ladder that is 2.5 m in height? Is the answer 7.5J?

OpenStudy (lifeisadangerousgame):

73.5J?

OpenStudy (lifeisadangerousgame):

*

OpenStudy (experimentx):

use m*g*h that is 9.8*2.5*3 = 7.3J you are right!!

OpenStudy (lifeisadangerousgame):

Wait, it's 7.3J?

OpenStudy (experimentx):

oops sorry, it's 73.5J

OpenStudy (lifeisadangerousgame):

Ohh, ok :) Thanks!

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