The value of an object's acceleration may be characterized in equivalent words by which of the following?
a. displacement
b. rate of change of displacement
c. velocity
d. rate of change of velocity
d
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A 1200 kg car is moving at 5.0 m/s EAST. It strikes an 1800 kg car at rest. The cars have an elastic collision and move in the EAST or WEST direction. The velocity of the 1200 kg car after the collision is
A. 4.0 m /s EAST. B. 1.0 m/s EAST. C. 4.0 m/s WEST. D. 1.0 m/s WEST. E. 3.00 m/s EAST.
During the Hayashi track, a star drops drastically in both ________ and ________
Fill in the blank(s) with correct word
On a clear day, the sky appears to be more blue toward the zenith (overhead) than it does toward the horizon. This occurs because
A) the atmosphere is denser higher up than it is at the earth's surface. B) the temperature of the upper atmosphere is higher than it is at the earth's surface. C) the sunlight travels over a longer path at the horizon, resulting in more absorption. D) the atmosphere is more reddish over the ocean.
The speed of light in a certain medium is 2.2 × 108 m/s. What is the index of refraction of this medium?
A) 1.0 B) 1.2 C) 1.4 D) 1.6 E) 1.8