10. How much total work do you do when you lift a 50 kg microwave 1.0 m off the ground and then push it 1.0 m across a counter with a

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10. How much total work do you do when you lift a 50 kg microwave 1.0 m off the ground and then push it 1.0 m
across a counter with a force of 50 N?

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Physics Vodka 5 years 2021-09-05T10:28:16+00:00 2021-09-05T10:28:16+00:00 1 Answers 36 views 0

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Captcha* Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )

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Adela · Answer 1 · 2021-09-05T10:30:07+00:00

Adela

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2021-09-05T10:30:07+00:00 September 5, 2021 at 10:30 am

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Work formula:

$W = Fd\cos(\theta)$

F = 50N, d = 1.0 m

When you lift something straight up, the angle of the force is 90º

cos(90º) is 0, so there’s no work done when you lift the microwave off the ground

$W = (50N)(1.0)(0) = 0$

F = 50N, d = 1.0 m

When you push the microwave, the angle is 0º and cos(0º) is 1. So there is work done here:

$W = (50 N)(1.0m)(1)$

$W = 50$

total work = 50 joules