Question

4. In a game of pool, the cue ball travelling v_o m/s collides linearly with the (stationary) 9 ball. After the collision, the nine ball travels with 99% of v_oin the same original direction as the cue ball, and, the cue ball is travelling at – 0.01% v_o. What can be surmised about the collision?
A. The collision was elastic                                                    B. The collision was inelastic
C. Momentum was conserved                                             D. Momentum was not conserved
E. Energy was conserved                                                       F. Energy was not conserved
G. Both balls were the same mass                                      H. The Balls had different masses

5. What kind of energy does a rocket have as it is ascending (before the engines shut off)?

A. Chemical Potential                                 B. Gravitational Potential                         C. Electric Potential                   D. Kinetic

7. Cooking oil is flowing through a 2” pipe. Which of the following would increase the volume flow rate of the oil?

       A. Increasing the radius of the pipe                                                                        B. Decreasing the radius of the pipe

       C. Increasing the Pressure difference on each end of the pipe                        D. Decreasing the viscosity of the oil

       E. Increasing the length of the pipe                                                                        F. Reducing the elevation of the outflow

9. Two pistons of a hydraulic lift have radii of 2.673 cm and 20.00 cm.  If a 350.0 N downward force on the smaller piston lifts a mass of 2.000x10³kg supported by the 20.00-cm piston, about what is the ideal mechanical advantage of the system?

       A. 0.01786             B. 0.1337             C. 0.1750                   D. 5.714                    E. 7.482                     F. 56.00

Answer 1

Q4.
Here, the Vo remains conserved as it gets divided into the cue ball and the 9 ball.
The collision was elastic as we see the KE remains same,
Momentum was conserved
Energy was conserved
Both balls had same masses.