kg (about the mass of our ) and acadas of 4.7x101 m (about the height of a god s

Question

kg (about the mass of our ) and acadas of 4.7x101 m (about the height of a god sland mourean), suppose an objet tak frem rest fter it had fallen a distance of 0.019 m? (Assume that the gravitational force is constant over the distance of the fall and that the star is neot rotating) ar the surface or sich a stat, to, tast of2.1x10 would tis object be moving a Section 47 A 37-kg crate rests on a horiontal floox, and a 66-kg person is standing on the orate. ) Debermine the magnitude of the normal fonce that the floor exerts on the crate Determine the magnitude of the normal force that the crate exerts on the person u Section 4 5 A woman stands on a scale in a moving elevator. Her mass is 74.0 kg, and the combined mass of the elevator and scale is an additional 815 kg. Starting from rest, the elevator accelerates upward. During the the holsting cable applies a farce of 9890 What does the scale read during the acceleration? Additional Materials Secion 49

Explanation / Answer

acceleration due to gravity on surface,

a = G M / R^2

a = (6.67 x 10^-11)(2.1 x 10^20)/(4.7 x 10^3)^2

a = 634 m/s^2

vf^2 - vi^2 = 2 a d

v^2 - 0^2 = 2(634)(0.019)

v = 4.9 m/s .....Ans

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(A) N= (m + M)g = (37 + 66)(9.8)

N = 1009.4 N

(B) N = M g = 66 x 9.8 = 646.8 N

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