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lidiya [134]
3 years ago
6

A person holding a 30 kg box 1 m above the floor puts it down. How much work was done ? Remember , the force of an objects weigh

t = mass times gravity
A. 0.0j

B. 30j

C. 147 j

D. 294 j
Physics
2 answers:
IrinaK [193]3 years ago
4 0
Hey friend! The answer is D. 294 j
frosja888 [35]3 years ago
3 0
As long as the box was 1m off the floor. it's potential energy was m•g•h = 30•9.8 = 294 joules. When the person stopped restraining the box and allowed it to move, gravity did 294 joules of work on the box, and would have done more if the floor hadn't been in the way. The person did no work on the box.
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Using a 683 nm wavelength laser, you form the diffraction pattern of a 1.1 mm wide slit on a screen. You measure on the screen t
n200080 [17]

Answer:

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Explanation:

The position of the dark fringes (destructive interference) formed on a distant screen in the interference pattern produced by diffraction from a single slit are given by the formula:

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where

y is the position of the m-th minimum

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