D. kinetic friction produces a tangential forceE. its centripetal acceleration is changing magnitude ytytytytytA B C D E
7. (10 pts) A box of mass mslides along a surface that is inclined at an angle from horizontal. coefficient of kinetic friction between the box and the surface is k. How would the magnitude of its acceleration if it slides upthe incline compare to the magnitude of its acceleration if it slides downthe incline? The . 8. (10 pts) A perfect Hooke’s law spring hangs at rest from a rigid support. A metal ball of mass M is attached to the bottom end of the spring and released from rest, thereafter oscillating up-and-down in simple harmonic motion. If this scenario were repeated on another planet whose gravitational acceleration were smaller than 9.8 m/s2, the mass would oscillate: (select the correct choice from each list) 9. (10 pts) Which one of the following statement regarding work and energy is correct? 10. (10 pts) Two cars with speed v1>v2but same masses (m1= m2) collide head-on and stick together after the collision. A. The total kinetic energy before the collision is the same as the total kinetic energy after the collisionB. The total momentum before the collision is larger than the total momentum after the collisionC. Both cars stop after the collision D. The cars do not stop after the collision but move along the initial traveling direction of the car with speed v1E. The cars do not stop after the collision but move along the initial traveling direction of the car with speed v2
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