A sled is on a horizontal surface and a rope with tension T is pulling on it at an angle ? above the horizontal. The sled had mass M and does not move due to the frictional force. In this case the coefficient of friction is ?s. In terms of the variables given and g, what is the magnitude of the frictional force in this case?
a. ?sMg b. Tcos?
c. Tsin? d. ?sMgcos?
b
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If you are standing on the street listening to the siren of an ambulance as it is moving away from you, which of the following is TRUE?
A) the pitch/frequency of the siren seems lower than it really is B) the siren sounds louder than it really is C) none of the above D) the pitch/frequency of the sound is identical to what it would have been if the ambulance were not moving E) the pitch/frequency of the siren seems higher than it really is
In a series LRC circuit the rms voltage across the resistor is 80.0 V, across the capacitor is 120 V, and across the inductor is 60.0 V. What is the rms voltage applied to this circuit?
A. 60.0 V B. 80.0 V C. 100 V D. 120 V E. 140 V
Why do astronomers narrow their search to the "habitable zone" of other star systems?
a. the most likely place to support planets with thick atmospheres b. the least likely place to have zero ultraviolet radiation c. the most likely place with liquid water, and extraterrestrial life d. the most likely place to have oxygen in the atmosphere e. the least likely place to have wide temperature ranges on the surfaces of planets
The acceleration due to the Earth's gravity, in English units, is 32 ft/s2. In the absence of air friction, a ball is dropped from rest. Its speed on striking the ground is exactly 132 ft/s. From what height was the ball dropped?
A. 132 ft B. 421 ft C. 165 ft D. 272 ft