8. A 10-g bullet moving horizontally with a speed of 2.0 km/s strikes and passes through a 4.0-kg block moving with a speed of 4.0 m/s in the opposite direction on a horizontal frictionless surface. If the block is brought to rest by the collision, what is the kinetic energy of the bullet as it emerges from the block?
(A)0.51 kJ
(B) 0.29kJ
(C) 0.80 kJ
(D) 0.13 kJ
(E) 20.0 kJ

4.Block A, with a mass of 10 kg, rests on a 30* incline. The coefficient of kinetic friction is 0.20. The attached string is parallel to the incline and passes over a massless, frictionless pulley at the top. Block B, with a mass of 8.0 kg, is attached to the dangling end of the string (take √3 1.7 and g =10 m/s2). The acceleration of B is: (A) 0.72 m/s2, up (B) 0.72 m/s2, down (C) 2.6 m/s2, , up (D) 2.6 m/s2, down (E) 0 m/s2

5.Block A, with mass ma, is initially at rest on a horizontal floor. Block B, with mass mb, is initially at rest on the horizontal top surface of A. The coefficient of static friction between the two blocks is Hh- Block A is pulled with a horizontal force It begins to slide out from under B if the force is greater than: (A)mAg (B) mBg (C) u smig (D)usmBg (E)us(mA+mB)g

6.As a 2.0-kg object moves from m, the constant resultant force acting on it is equal to N. If the speed of the object at the initial position is 4.0 m/s, what is its kinetio energy at its final position? (A)62 J (B)53J (C)73J (D)86J (E)24 J

7.A certain pendulum consists of a 1.5-kg mass swinging at the end of a string (length = 2.0 m). At the lowest point in the swing the tension in the string is equal to 20 N. To what maximum height above this lowest point will the mass rise during its oscillation? Take g = 10 m/s2 (A)77 cm (B)50 cm (C)63 cm (D)33 cm (E)95cm

9. A wheel of radius R is mounted on a frictionless, horizontal axle that is perpendicular to the wheel and passes through the center of mass of the wheel. A light cord wrapped around the wheel supports a object of mass m. If released from rest with the string taut, the object is observed to fall with a downward acceleration of 4.0 m/s2. If the moment of inertia (of the wheel) about the given axle is written as BmR2, then B=? Take g= 10 m/s. (A)1.0 (B)1.5 (C)2.0 (D)3.0 (E) 3.5

10. A merry-go-round of radius R = 2.0 m has a moment of inertia I = 250 kg-m2, and is rotating at 10 rpm. A child whose mass is 25 kg jumps onto the edge of the merry-go-round, heading directly toward the center at 6.0 m/s. The new angular speed (in rpm) of the merry-go-round is approximately (A)10(B)9.2 (C) 8.5 (D)7.1 (E)6.4

11. The figure shows a uniform rod (length L = 1.0 m, mass m = 2.0 kg) suspended from a pivot a distance d = 0.25 m above its center of mass. If the angular frequency for small oscillations is ω, then ω2 , in (rad/s)2, is approximately (Given the moment of inertia about a perpendicular axis through the center of mass is = mL2 /12 and take g = 10 m/s2) (A)1.0 (B)6.25 (C) 2.25 (D) 17.1 (E) 12.25

12. A ball of mass me is released from rest and acquires velocity of magnitude vB before hitting the ground. The ratio of the kinetic energy the Earth (mass ) acquires to the kinetic cnergy the ball acquires is m: (A) 0. (B) (C) (D) 1. (E)

13. An asteroid revolves around the Sun with a perihelion 0.5 AU and an aphelion of 7.5 AU. What is its period of revolution? Knowing that lAU is the average radius of the Earth orbit around the Sun (A)4 years(B) 8 years (C) 16 years(D)32 years (E)64 years

14. A 3.0-kg block is on a horizontal surface. The block is at rest when, at t = 0, a force (magnitude P = 12 N) acting parallel to the surface is applied to the block causing it to accelerate. The coeflicient of kinetic friction between the block and the surface is 0.20. At what rate is the force P doing work on the block at t = 2.0 s? Take g = 10 m/s2.(A)54W(B)48W(C)42W(D)59 W(E) 24 W