The average density of a planet can be obtained from
A) the Doppler method only
B) a combination of the Doppler and transit methods
C) the transit method only
D) a combination of the astrometric and Doppler methods
B
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The primary winding of an electric train transformer has 400 turns and the secondary has 50. If the input voltage is 120 V (rms) what is the output voltage?
A. 15 V (rms) B. 30 V (rms) C. 60 V (rms) D. 2.4 V (rms) E. 960 V (rms)
A 1000-kg car is driving toward the north along a straight road at a speed of 20.0 m/s. The driver applies the brakes and the car comes to a rest in a distance of 140 m. What is the constant force applied to the car to bring it to rest?
A) 1.43 N north B) 7.00 × 103 N south C) 1.43 × 103 N south D) 1.43 N south E) 143 N south
Which of the following telescopes must be used above Earth's atmosphere?
a. an optical telescope b. the VLBA telescope c. an X-ray telescope d. a radio telescope e. None of the other choices are correct.
When an automobile moves with constant velocity the power developed is used to overcome the frictional forces exerted by the air and the road. If the power developed in an engine is 50.0 hp, what total frictional force acts on the car at 55 mph (24.6 m/s)? One horsepower equals 746 W