Cesium 2013

Here are the questions: (EDITED!)



Prob. 8 (p.92):
(II) What average force is needed to accelerate a 9.50-g bullet from rest to 500 m/s over a distance of 0.700 m along the barrel of a rifle?

Prob. 4 (p.230):



(I) Two cords support a chandelier in the manner shown in Fig. 9-5 except that the upper wire makes an angle of 45^o with the ceiling. If the cords can sustain a force of 1200N wihtou breaking, what is the maximum chandelier mass that can be supported?

Prob. 22 (p.93):

(II) A man pushes a 16-kg mower at a constant speed with a force of 90N directed along the handle, which is at an angle of 45^o to the horizontal (Fig.4-31). Calculate (a) the horizontal retarding force on the mower, (b) the normal force exerted vertically upward on the mower by the ground, and (c) the force the man must exert on the lawn mower to accelerate it from rest to 1.5m/s in 2.5 seconds. Assume the same retarding force.



Prob. 39 (p. 95):



(II) Two crates, of mass 80kg and 110kg, are in contact and at rest on a horizontal surface (Fig. 4-37). A 650-N force is exerted on the 80-kg crate. If the coefficient of kinetic friction is 0.20, calculate (a) the acceleration of the system, and (b) the force that each crate exerts on the other.

Prob. 43 (p. 95):

(II) The block shown in Fig. 4-38 has a mass m=8.0kg and lies on a smooth plane tilted at an angle Θ= 20° to the horizontal. (a) Determine the acceleration of the block as it slides down the plane. (b) If the block starts from rest 12.0 m up the plane from its base, what will be the block's speed when it reaches the bottom of the incline? Ignore friction.



Prob. 50 (p. 96):

(III) Suppose the coefficient of static friction between m₁ and the plane in Fig. 4-40 is μ_k = 0.15, and that m₁=m₂=2.0kg. Determine the aceleration of m₁ and m₂ given that Θ=30°



*Comment if I missed/wronged anything.