The observed spectral lines of a star are all shifted towards the red end of the spectrum. Which statement is true?
A) The star is not rotating.
B) This is an example of the photoelectric effect.
C) This is an example of the Doppler effect.
D) The star has a radial velocity towards us.
E) The second law of Kirchhoff explains this.
C
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In 1998, it was announced that the expansion of the universe is accelerating. What does this imply from the perspective of the big bang?
a. A force exists that we knew nothing about that causes the acceleration. b. The universe must be closed. c. The universe is finite. d. The amount of dark matter must be greatly less than the amount of normal matter. e. The universe must be infinitely old.
An object's momentum is equal to its ____
a. acceleration multiplied by its mass b. acceleration divided by its weight c. velocity multiplied by the gravitational constant d. velocity multiplied by its mass e. velocity divided by its weight
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The acceleration due to the Earth's gravity, in English units, is 32 ft/s2. In the absence of air friction, a ball is dropped from rest. Its speed on striking the ground is exactly 132 ft/s. From what height was the ball dropped?
A. 132 ft B. 421 ft C. 165 ft D. 272 ft