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Rama09 [41]
2 years ago
8

Which runner has greater kinetic energy: a 45 kg runner moving at a speed of 7 m per second or a 93 kg runner moving at a

Physics
1 answer:
bagirrra123 [75]2 years ago
7 0

Kinetic Energy = (1/2) (mass) (speed)

First runner:  KE = (1/2) (45kg) (49 m/s)  =  1,102.5 Joules  

Second runner:  KE = (1/2) (93kg) (9 m/s)  =  418.5 Joules

The <em>first runner </em><em>has 163</em>% more kinetic energy than the second runner has.

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Light is incident on the left face of an isosceles prism; with an apex angle of 49o, such that the light exiting the right face
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Answer:

\mu = 1.645

Explanation:

By Snell's law we know at the left surface

\theta_i = 19^o

\theta_r = ?

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now we have

1 sin19 = \mu sin\theta_r

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now on the other surface we know that

angle of incidence = \theta_r'

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so again we have

\mu sin\theta_r' = 1 sin90

so we have

\theta_r = sin^{-1}\frac{0.33}{\mu}

\theta_r' = sin^{-1}\frac{1}{\mu}

also we know that

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sin^{-1}\frac{0.33}{\mu} + sin^{-1}\frac{1}{\mu} = 49

By solving above equation we have

\mu = 1.645

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3 years ago
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Answer:

0.661 s, 5.29 m

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