Identical guns fire identical bullets horizontally at

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25. Identical guns fire identical bullets horizontally at the same speed from the same height above level planes, one on the Earth and one on the Moon. Which of the following three statements is/are true? I. The horizontal distance traveled by the bullet is greater for the Moon. II. The flight time is less for the bullet on the Earth. III. The velocities of the bullets the moment just before they hit the ground are the same. I. The horizontal distance traveled by the bullet is greater for the Moon. II. The flight time is less for the bullet on the Earth. III. The velocities of the bullets the moment just before they hit the ground are the same. (a) III only (b) I and II only 4 (c) I and III only (d) II and III only (e) I, II and III 10
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26. A meter stick on a frictionless tabletop is pivoted at the 80-cm mark. The figure below shows the meter stick as viewed from above. 0cm 20cm 40cm 60cm 80cm 100cm ~ F 1 A force ~ F 1 in the plane of the table is applied perpendicularly to the end of the stick at 0 cm, as shown. A second force ~ F 2 (not shown), also on the plane of the table, is applied at the 100-cm end of the stick. If the stick does not rotate: 27. A 2 kg-block is attached to a horizonal ideal spring with a spring constant of 200 N/m. When the spring has its equilibrium length the block is given a speed of 50 m/s. What is the maximum elongation of the spring? 28. A thin-walled hollow sphere rolls without sliding along the floor. The ratio of its translational kinetic energy to its rotational kinetic energy (about an axis through its center of mass) is: Good luck! 11
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