Note: a namerical value is considered to be correct tf it is within 2% of the an

Question

Note: a namerical value is considered to be correct tf it is within 2% of the answer Multiple Choice Questions (6 points each Circle the correct answer or answers; there may be one or You need to select all correct answers (and only the correct answers) to get full multiple correct answers credit L In an elastic collision, the total is conserved for the system. a)velocity b) speed c)linear momentum 2. Circle the correct the statement(s) from the following d) kinetic energy a) If the kinetic energy of a particle is zero, its linear momentum is then zero. b) If an object rotates but its center of mass does not move, its kinetic energy is then zero. c) If an object does not rotate but its center of mass moves, its kisetic energy is then zero. d) If the total linear momentum of a system of 2 particles is zero, the total kinetic energy of the system is then zero. 3. For a satellite in a stable circular orbit around the Earth: a) the gravitational acceleration g on the satellite is bigger if the satellite is closer to the Earth. the center of the Earth. c) the gravitational acceleration g on the satellite must be bigger for a satellite which moves at a higher speed d) the gravitational potential energy is higher for a satellite that is farther from the Earth of the c) sum of total KE and potential energy 4. When a ball rolls without slipping down an inclined plane, the the ball is conserved KE means kinetic energy here. a)rotational KE b)total KE d)potential on an object in static equilibrium. b) pressure 5. There cannot be any a) net force c) frictional force d) net torque Fill-in-the-Blank Questions (5 blanks,8 points each): don't forget the unit; unit carries partial credit 6. A skier of mass 100 kg rides a ski lift to the top, which is 100 m higher than the base of the lift. a) The increase in the skier's gravitational potential energy is b) When the skier skis down the run, assuming that no force other than gravity does work, her final velocity will be The density of water is 1.00 g/cm' and the density of stone is 2.50 g/cm The buoyant force on the stone is 7. A solid stone of mass 1.00 kg sits at the bottom of a swimming pool, fully submerged in water The block, of mass 0.380 kg, is subject to no horizontal external forces during the collision with the bullet. After the collision, the block (with the bullet in it) is observed to move at a speed of 8.00 m/ a) 8. A bullet of mass 20.0 g is fired into an initially stationary block and comes to rest in the The total kinetic energy after the collision is b) The initial speed of the bullet is

Explanation / Answer

1) In elastic collision, linear momentum and kinetic energy is conserved., Answer - c) and d)

2) if KE = 0, v = 0, so linear momentum = 0, correct statement is a)

3) if satellite is closer, g is larger due to larger gravitational attraction. so 1st statement is correct

g is inversely proportional to square of the distance from center of earth. so 2nd statement is wrong.

higher the speed, closer is the satellite to earth and hence higher is the g, 3rd statement is correct

as distance between two objects increases, gravitational potential energy also increases. so 4th statement is correct

So answer is - a), c) and d)

4) sum of PE and KE is conserved. So answer is --- c)

5) net force and net torque = 0 at static equlibrium, so answer is -- a) and d)

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