# img205 - 77777 77777 10 11 A disk is free to rotate on a...

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Unformatted text preview: 77777 77777 10. 11. A disk is free to rotate on a ﬁxed aids. A force of given magnitude F, in the plane of the disk, is to be applied. Of the following alternatives, the greatest angular acceleration is obtained if the force is (1) applied tangentially at the rim. (2) applied tangentially halfway between the axis and the rim. (3) applied radially halfway between the axis and the rim. (4) applied radially at the rim. (5) applied at the rim but neither radially nor tangentially. When a man on a frictionless rotating stool extends his arms horizontally, his rotational kinetic energy (1) must decrease. (2) must increase. \ (3) must remain the same. (4) may increase or decrease depending on his initial angular velocity. (5) may increase or decrease depending on his gravitational potential energy. 12. A person blows across the top of one arm of a U-tube partially ﬁlled with water. The water in that arm: 13. 14. 15. 16. 17. (1) rises slightly. (2) drops slightly. (3) remains at the same height. (4) rises if the blowing is soft, but drops if it is hard. (5) rises if the blowing is hard, but drops if it is soft. An automobile driver puts on the brakes and deceleratos from 30.0 m/s to zero in 10.0 5. What distance does the car travel? (1) 150 m (2) 120 m (3) 180 m (4) 210 m (5) 250 m ﬁn girtomobile driver puts on the brakes and decelerates from 30.0 m/s to zero in 8.0 8. What distance does the car rav . (1) 120 m (2) 150 m (3) 180 m (4) 210 m (5) 250 m ﬁnvzlurtomobile driver puts on the brakes and decelerates from 30.0 m/s to zero in 12.0 3. What distance doa the car 1'3 . (1) 180 m (2) 120 m (3) 150 m (4) 210 m (5) 250 In An automobile driver puts on the brakm and deeeleratee from 30.0 m/s to zero in 14.0 3. What distance does the car travel? (1) 210 m (2) 120 m (3) 180 m (4) 150 m (5) 250 m A riﬂe is aimed horizontally toward the center of a target 100 m away. If the bullet strikes 10 cm below the center, what was the velocity of the bullet? (Ignore air friction.) (1) 700 m/s (2) 640 m/s (3) 572 m/s (4) 783 m/s (5) 436 m/s 193 ...
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