Three cars (car L, car M, and car N) are moving with the same velocity, and slam on the brakes. The most massive car is car L, and the least massive is car N
Assuming all three cars have identical tires, for which car is the amount of work done by friction in stopping it the highest? A) The amount of work done by friction is the same for all cars.
B) Car L
C) Car M
D) Car N
B
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Which of the following is a form of matter and not a form of radiation?
A) gamma rays B) the electron beam that creates the picture on a TV tube C) X-rays D) None of the above are forms of radiation. E) All of the above are forms of radiation.
Hot, low-density gas can be detected in galactic clusters through X-ray emission. The gas is important in understanding dark matter because ____
a. dark matter is responsible for heating the gas b. dark matter must make the cluster massive enough to hold on to the hot gas c. the gas may be the source of dark matter d. the gas is clumped in empty places between galaxies where there is more dark matter e. the gas is produced by dark matter
A car traveling at 3.0 m/s has a constant acceleration of 4.0 m/s2 . After 2.0 seconds, the velocity is
A. 5.0 m/s. B. 7.0 m/s. C. 9.0 m/s. D. 11 m/s. E. 13 m/s.
The present atmospheres of the terrestrial planets probably originated from their internal activity.
Answer the following statement true (T) or false (F)