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Zarrin [17]
3 years ago
9

7. Which phase changes require a gain of energy (heat)?

Physics
2 answers:
Keith_Richards [23]3 years ago
7 0

Answer:

c

Explanation:

adell [148]3 years ago
4 0

Answer:

C.

Explanation:

When there is heat the water turns into vapour if not covered but will turn back to water if covered (condensation)

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1. The United States Department of Agriculture’s Food Safety and Inspection Service (FSIS)

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authorized to regulate food labeling for exotic species of animals under the  

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3 years ago
A 75.0 kg diver falls from rest into a swimming pool from a height of 5.10 m. It takes 1.34 s for the diver to stop after enteri
vichka [17]

Answer:

559.5 N

Explanation:

Applying,

v² = u²+2gs............. Equation 1

Where v = final velocity,

From the question,

Given: s = 5.10 m, u = 0 m/s ( from rest)

Constant: 9.8 m/s²

Therefore,

v² = 0²+2×9.8×5.1

v² = 99.96

v = √(99.96)

v = 9.99 m/s

As the diver eneters the water,

u = 9.99 m/s, v = 0 m/s

Given: t = 1.34 s

Apply

a = (v-u)/t

a = 9.99/1.34

a = -7.46 m/s²

F = ma.............. Equation 2

Where F = force, m = mass

Given: m = 75 kg, a = -7.46 m/s²,

F = 75(-7.46)

F = -559.5 N

Hence the average force exerted on the diver is 559.5 N

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