More Work-Energy Problems Video Lessons

Example

# Problem: A 1.7 kg book is lying on a 0.80 m -high table. You pick it up and place it on a bookshelf 2.3 m above the floor.A) During this process, how much work does gravity do on the book?B) During this process, how much work does your hand do on the book?

###### FREE Expert Solution

Potential energy,

$\overline{){\mathbf{U}}{\mathbf{=}}{\mathbf{m}}{\mathbf{g}}{\mathbf{h}}}$

Work done,

$\overline{){\mathbf{W}}{\mathbf{=}}{\mathbit{F}}{\mathbit{d}}}$

A)

m = 1.7 kg

g = 9.8 m/s2

Δh = hf - hi = 2.3 m - 0.80 m = 1.5 m

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###### Problem Details

A 1.7 kg book is lying on a 0.80 m -high table. You pick it up and place it on a bookshelf 2.3 m above the floor.

A) During this process, how much work does gravity do on the book?

B) During this process, how much work does your hand do on the book?

What scientific concept do you need to know in order to solve this problem?

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