A block, moving on a frictionless horizontal surface on Earth, requires a force if it is to be stopped. Now suppose that the same block, moving with the same speed on a frictionless horizontal surface on the Moon, where gravity is less, is to be stopped in the same time. We can say that, compared to the Earth,
A. the block could not be stopped.
B. the force required would be the same.
C. less force is required to stop the block on the Moon.
D. greater force is required to stop the block on the Moon.
Answer: B
You might also like to view...
A certain factory whistle can be heard up to a distance of 9.8 km
Assuming that the acoustic output of the whistle is uniform in all directions, at what distance from the factory is the intensity level of the whistle sound equal to 25 dB? The threshold of human hearing is 1.0 × 10-12 W/m2. A) 550 m B) 660 m C) 830 m D) 940 m E) 1,100 m
A mosquito flies diagonally from a corner at the floor of a rectangular room, with coordinates (0, 0, 0) to the opposite corner at the ceiling, with coordinates (5.5, 3.75, h) m at a rate of 0.8 m/s. If it takes the mosquito 11 seconds to make the direct flight, what is h?
a. 5.8 m b. 6.7 m c. 8.5 m d. 8.3 m
Which of the following is TRUE?
a) The average surface temperature of Venus is about 30 degrees Fahrenheit. b) Mercury has a very thick atmosphere made mostly of carbon dioxide. c) The runaway greenhouse effect causes the present temperatures on Mars to exceed thoseon Earth. d) Mercury rotates exactly one and a half times for every one revolution around the Sun. e) Venus has no volcanos on its surface.
Astronomers believe that the Moon did not differentiate to the same degree as Earth because:
A) the Moon was made of solid debris, not liquids like our hydrosphere. B) the meteors that hit the Moon were lighter than those that hit us, so did not generate as much heat on the surface. C) the less dense and smaller Moon did not have as much radioactivity as the larger Earth in its core. D) the Moon was formed after the Earth was, so its radioactivity was less. E) the Moon was made of very different materials than our mantle and crust.