Suppose a particle is moving along a straight line with a speed v for a time t, then stops for a time t, and then resumes moving along the original direction with speed v for time t. What has been the average speed of the particle for the total time period 3t?
Answer: 2v/3
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A mosquito flying at 3 m/s encounters a 3-m/s breeze blowing in the same direction, which gives it a resulting speed over the ground of
A) 0 m/s. B) 3 m/s. C) 4 m/s. D) 6 m/s.
A refrigerator has a coefficient of performance of 1.15, and it extracts 7.95 J of heat from the cold reservoir during each cycle
(a) How much work is done on the gas in each cycle? (b) How much heat is exhausted into the hot reservoir in each cycle?
Wien's law allows astronomers to measure what property of a star?
A. the chemical composition of the star B. the surface temperature of the star C. the distance to the star D. All of these choices are correct.
An ideal gas is allowed to expand adiabatically until its volume increases by 50%. By approximately what factor is the pressure reduced? (? = 5/3.)
a. 1.5 b. 2.0 c. 2.5 d. 3.0 e. 3.5