Assume that the reference frame is moving with the person indicated in each of the following situations. In which case is the reference frame noninertial?
a. The person is walking at a constant speed along a straight, horizontal sidewalk.
b. The person is walking at a constant speed along a straight sidewalk that is inclined downward at a slight unchanging angle.
c. The person is riding an elevator upward at constant speed. d. The person is skydiving and is freefalling not yet having opened her parachute.
D
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Chromatic aberration occurs in a ____ telescope when ____
a. reflecting; different colors of light do not focus at the same point. b. refracting; different colors of light do not focus at the same point. c. reflecting; light of different wavelengths get absorbed by the mirror. d. refracting; light of different wavelengths get absorbed by the lens.
Supernovae are triggered because iron releases the most fusion energy of any element
a. True b. False Indicate whether the statement is true or false
Approximately how many days does it take for a white dwarf supernova to decline to 10% of its peak brightness?
A) 3 days B) 30 days C) 170 days D) 300 days
A pendulum bob swings to and fro as shown in the sketch. The kinetic energy of the bob
1) is maximum at position A, 2) is maximum at position B, 3) is the same at all positions, and the potential energy is maximum at position 4) A. 5) B. 6) is the same at all positions.