The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. A racecar driver steps on the gas, changing his speed from 10 m/s to 30 m/s in 4 seconds. The acceleration of the racecar is
a. 0 d. 5 m/s2
b. 2 m/s2 e. 7.5 m/s2
c. 4 m/s2
D
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A 3.0-kg block slides on a rough horizontal surface. A force of 8.0 N acting parallel to the surface is applied to the block. The coefficient of kinetic friction between the block and the surface is 0.15 . What is the magnitude of the block's acceleration?
a. 1.9 m/s2 b. 1.2 m/s2 c. 2.3 m/s2 d. 1.5 m/s2 e. 2.9 m/s2
A battery operating a large flashlight produces a current of 2 amperes in a light bulb that has a resistance of 4 ohms. The voltage of the battery is __________
Fill in the blank(s) with correct word
Mort weighs 700 newtons on Earth. He takes a low-orbit voyage in an Earth satellite. During the voyage his weight is
A) zero. B) a little more than 700 newtons. C) 700 newtons. D) a little less than 700 newtons. E) just a few newtons.
Which has a larger volume, a liter of water or a liter of mercury (a liquid metal)?
a. water b. mercury c. none of these