Question 6(0.5 points) A skier with a mass of 60.8 kg is sliding down a 24.6 deg

Question

Question 6(0.5 points) A skier with a mass of 60.8 kg is sliding down a 24.6 degree snowy slope. Find the coefficient of kinetic friction for the skier if friction is known to be 42.0 N. g= 10 m/s^2 Question 7(1 point) A stone is thrown straight downward with initial speed of 8.1 m/s from a height of 62 m. What Is the time it takes to reach the ground? Question 8 You throw a stone vertically upward from the roof of a building with a velocity of 52 m/s and lands the ground after 11.0 sec. What is the height of the building? Assume g = 10 m/s^2

Explanation / Answer

6. use coefficient of frction u = F/mg sin theta

u = 42/(60.8 * 9.8*24.6)

u = 0.169

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7. use the kinematic eqn

H = ut + 0.5 gt^2

62 = 8.1t + 4.9 t^2

t = 2.82 secs

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8.

H = ut - 0.5 gt^2

H = 52 * 11 - (0.5 * 9.8 * 11^2)

H = 21 m

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