Driving eastward just before sunrise, if you observe the Moon in the eastern sky, its phase must be:
A) full moon.
B) first quarter.
C) waxing Gibbous.
D) waning Crescent.
E) new moon.
D
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I stretch a rubber band and "plunk" it to make it vibrate in its fundamental frequency. I then stretch it to twice its length and make it vibrate in the fundamental frequency once again. This rubber band is made so that doubling its length doubles the tension and reduces the mass per unit length by a factor of 2 . The new frequency will be related to the old by a factor of:
a. 4.0. c. 1.4. b. 2.0. d. 1.0.
As more lamps are put into a parallel circuit, the overall current in the power source
A) increases. B) decreases. C) remains the same.
A 160 lb person has a mass of 160/32 = 5 slugs. A 160-lb person steps into an elevator and stands on a bathroom scale. Determine the scale reading for the given scenarios. After moving downwards at constant speed, the elevator is slowing down at 2 m/s2 as it is coming to rest
a. 150 lb b. 160 lb c. 170 lb d. none of the above
A fast train approaches a car waiting at a grade crossing and sounds its horn. A person in the car will notice that, compared to what it would be if the train were at rest, the horn sound's
A. frequency appears to be lower. B. wavelength appears to be longer. C. wavelength appears to be the same. D. frequency appears to be higher.