A child is standing at the rim of a rotating disk holding a rock. The disk rotates freely without friction. If the rock is dropped at the instant shown, which of the indicated paths most nearly represents the path of the rock as seen from above the disk?
2
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How much money does it cost to leave on 10 60 watt lights for 15 hours, if the cost of electricity is 8 cents per kWh?
a. 15¢ b. 32¢ c. 72¢ d. 120¢ e. 480¢
A 0.14-km wide river flows with a uniform speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. What is the speed of the boat relative to the water?
a. 5.7 m/s b. 8.5 m/s c. 8.1 m/s d. 7.0 m/s e. 6.4 m/s
In his experiment with rolling balls down a ramp at different ramp angles, what did Galileo discover?
a. For any fixed ramp angle, the speed of a ball was always constant, regardless of its weight. b. For any fixed ramp angle, the acceleration of a ball was always constant, regardless of its weight. c. For any fixed ramp angle, the velocity of a ball was always constant, regardless of weight. d. The velocity and acceleration were both constant. e. The heavier balls rolled down the ramp faster.
If a person is farsighted the corrective lens will
a. take an object at the near point and form an image at 25 cm. b. take an object at 25 cm and form an image at the near point. c. take an object at infinity and form an image at 25 cm. d. take an object at infinity and form an image at the near point.