Question

The professor didn't make an answer key for this study guide and I wanted to know if I'm doing these right.

4. A man pushes with a force of 700 N on a broken down car at an angle of 0 degrees from horizontal. He manages to move it form to a garage. How much energy does he use? 5. A block sits on a horizontal surface with friction. The mass of the block is kg. A force of 14Nis just able to move the block parallel to the surface. What is the approximate coefficient of friction? 6. On another planet with unknown gravitational field, two masses are attached by a string as shown. The mass, M2 - 16 kg and M1-e. What is the coefficient of friction that just allows the system to stay at rest? rz M.İ th arth 10. A woman throws a ball of masse from its initial position (at the origin) to a point at (201+3j+o k) meters, where k is the upward unit vector. The work done by the gravitational force on the ball s -300J. What is the distance D, in m? 11. A CONSTANT force pushes an object and speeds it up. The object moves from (61-8j+4 k) m to( 11i-5j+4 k) m. The net force acting on the object is equal to (31+4j+5 k) N. What is the increase in kinetic energy, in J? 12. Three skiers (A, B and C) start from rest down a hill with negligible friction and take different routes. One takes a short, steep slope, one takes a long, gentle slope and one takes a long route over a hill. What is the order of who is going the fastest (highest speed) when they meet at the bottom? 7. A block of mass M1 is at rest on a ramp with an angle of 14 degrees, but is just about to slide. The block is replaced with another block M2 of twice the mass. After seeing what happens with M2, the angle is decreased to 13 degrees. What will happen? 8. A woman pulls a block along a horizontal surface at a constant speed with a force of N acting 20° above the horizontal. The block moves and she does 85 J of work. What is the distance, in m, that the block moves? d. 9. A person does 200 J work lifting a bucket, mekg, from the bottom of a well through a distance 10 m. What was th of friction? b. C. d. 6 13. At a bowling alley, the ball feeder must exert a force to push the bowling balls up a 1 m long ramp, as in the figure. The ramp leads the balls to a chute that is 0.5 m above the base of the ramp. A pproximately,must be exerted on a bowling ball. What is the mass of a ball, in N7 30 M 1.0 m 0.5 m 14. A student drops two ball bearings, a lighter one and a heavier one, from the roof of Tienan Hall. The friction is insignificant. Just before hitting the ground, the heavier ball has twice the kinetic energy. How much faster did it go? a. C. d. e. 15. A student is pulling a 60 kg box with a 20 kg box attached to it. Both lie on a horizontal surface with friction coefficient 0.7. Her horizontal force isN. What is the frictional force, in N, due to the small box? 16. A block starts from rest and slides from the top down a frictionless ramp. It has a speed v at the bottom. A new ramp is tested that is 4 times a high. What will a block's speed be at the bottom in units of v2 e.

Answer 1

700 N づけ WF.S md 2
GM
2. -3030D