Velocity: A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this trip?
A. 84 km/h
B. 89 km/h
C. 90 km/h
D. 91 km/h
Answer: B
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Beats: Two taut strings of identical mass per unit length are stretched with the same tension with their ends fixed, but one string is 0.330 cm longer than the other. Waves on these strings propagate at 34.0 m/s.The fundamental frequency of the shorter string is 258 Hz. What is the beat frequency when each string is vibrating at its fundamental frequency?
A. 12.3 Hz B. 9.00 Hz C. 12.0 Hz D. 12.7 Hz E. 11.3 Hz
An object is 50 cm in front of a plane mirror. Its image will be located
a. 50 cm in front of the mirror. b. at the mirror's surface. c. 50 cm behind the mirror. d. 25 cm in front of the mirror. e. 25 cm behind the mirror.
You observe a rocket moving away from you. Compared to its length when it was at rest on the ground, you will measure its length to be
1.shorter. 2.longer. 3.the same.
If evaporation exceeds precipitation, the salinity of the ocean in that area
A) decreases. B) stays the same. C) gets denser. D) increases.