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2 years ago

6

A 380-N girl walks down a flight of stairs so that she is 2.5 m below her starting level. What is the change in the girl's gravi

tational potential energy?

2 answers:

Svetach [21]2 years ago

8 0

PEg = Mass x Height x Gravity. So it doesn't matter how much PEg she started with, since you're finding how much it changed when she walked down 2.5 meters of stairs. So by plugging into the equation, you'll find how much potential energy was lost by walking down. (I'll leave it up to you since idk if you use 10 or 9.8 as gravity)

White raven [17]2 years ago

6 0

To find gravitational potential energy you need to multiply weight * height. The weight in this situation would be 380-N. Our height is 2.5 m. 380 *2.5= 950, or 950 J of gravitational potential energy.

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Explanation:

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Max. Resistance = $R_{1} + R_{2} + R_{3}$

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(b) Now, the minimum resistance is calculated as follows.

Min. Resistance = $\frac{1}{R_{1}} + \frac{1}{R_{2}} + \frac{1}{R_{3}}$

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2 years ago

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