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olga nikolaevna [1]
3 years ago
14

a 2.80 kg mass is dropped from a height of 4.50 m. find its potential energy(PE) at the moment it is dropped. PLEASE HELP

Physics
1 answer:
Maurinko [17]3 years ago
4 0

Answer:

126 J

Explanation:

The potential energy only depends on the vertical height from the ground level.

We consider the ground level to have zero P.E.

We get, when it is 4.5 m above the ground level,

P.E. =  mgh

      = 2.8×10×4.5

      = 126 J

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Convert 1,265,341 mm to m.
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The answer in Meters is going to to 1265.341
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A quantity that has direction as well as size is a scalar.<br><br><br> True or False
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Answer:

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Scalar quantities only have magnitude (size). Scalar quantities include distance...

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Explanation:

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3 years ago
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You are sitting on a deck of your house surrounded by oak trees. You hear the sound of an acorn hitting the deck. You wonder if
Black_prince [1.1K]

Answer: 96N

Explanation:

To calculate the velocity of the impact On the persons head, we have

h = gt²/2

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t² = 28/9.8

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t = 1.69s

V = u + at

V = 0 + 9.81*1.69

V = 16.58m/s

a(average) = (v1² + v2²) /2Δy

a(average) = 16.58² + 0)/2 * 0.005

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Using newton's second law of motion,

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Answer:

Dehydration reactions assemble polymers, and hydrolysis reactions break down polymers.

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dehydration reaction is a conversion that involves the loss of water from the reacting molecule or ion.

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