Freely falling bodies experience
a. motion with constant velocity.
b. motion with zero acceleration.
c. motion with constant acceleration.
d. motion at a constant speed.
e. none of the above
c
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Series/Parallel Circuits: As more resistors are added in series to a constant voltage source, the power supplied by the source
A. increases. B. decreases. C. does not change. D. increases for a time and then starts to decrease.
What is the cosmic microwave background?
A. radiation released when neutral atoms formed in the young Universe B. radio noise from Seyfert galaxies C. radiation from the first stars formed when the Universe was young D. radiation from hot gas in intergalactic space
Uniform Circular Motion: Pulling out of a dive, the pilot of an airplane guides his plane into a vertical circle. At the bottom of the dive, the speed of the airplane is 320 m/s. What is the smallest radius allowable for the vertical circle if the pilot's apparent weight is not to exceed 7.0 times his true weight?
A. 1700 m B. 1500 m C. 2200 m D. 230 m E. 42 m
A car is driven 1 200 m north at 20.0 m/s and then driven 1 600 m east at 25.0 m/s. What is the magnitude of the average velocity for this trip?
a. 16.1 m/s b. 22.6 m/s c. 31.3 m/s d. 11.3 m/s e. 62.2 m/s