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givi [52]
3 years ago
8

Using energy considerations, calculate the average force a 60.0-kg sprinter exerts backward on the track to accelerate from 2.00

to 8.00 m/s in a distance of 25.0 m, if he encounters a headwind that exerts an average force of 30.0 N against him.
Physics
1 answer:
baherus [9]3 years ago
7 0

Answer:

F = 102 N

Explanation:

ASSUMING the track is horizontal to avoid gravity potential energy considerations.

The work of the applied force must overcome friction work and increase the kinetic energy of the runner

F(d) = Ff(d) + ½m(v² - u²)

F = Ff + m(v² - u²) / 2d

F = 30.0 + 60.0(8.00² - 2.00²) / (2(25.0))

F = 102 N

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2 years ago
The equation below is for potassium oxide.
ValentinkaMS [17]

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3 years ago
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True or False: Global wind patterns have less to do with air temperature than local winds.
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We go out to sunbathe on a warm summer day. If we soak up 80 British thermal units per hour​ [BTU/h] of​ energy, how much will t
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Answer:

0.62127°C

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3 years ago
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