When she reaches the top, she has more potential energy than she had at the bottom.
Potential energy = (mass) x (gravity) x (height)
= (40 kg) x (9.8 m/s²) x (5 m)
= 1,960 more joules .
Power = (energy) / (time)
= (1,960 joules) / (7 seconds)
= 280 watts
(about 0.375 horsepower)
Answer:
As a substance reaches the melting point, the particles begin to move faster, causing the substance to become a liquid.
Explanation:
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String the·o·ry
noun
a cosmological theory based on the existence of cosmic strings.
<span>The factors that determine how fast weathering occurs are the type of rock, type of soil, time it takes, and the climate.</span>
2.c
3.b
1.a
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