A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with track at the top of the loop, what is the minimum value for its centripetal acceleration at this point?
A) g downward
B) 2 g upward
C) 0.5 g downward
D) g upward
E) 2 g downward
A
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Two violinists are trying to tune their instruments in an orchestra. One is producing the desired frequency of 440.0 Hz
The other is producing a frequency of 448.4 Hz. By what percentage should the out-of-tune musician change the tension in his string to bring his instrument into tune at 440.0 Hz? A) +1.9% B) -1.9% C) +3.7% D) -3.7% E) +8.4%
Radiation Doses: The maximum permissible workday dose for occupational exposure to radiation is 11 mrem. A 77-kg laboratory technician absorbs 2.3 mJ of 0.5-MeV gamma rays in a work day. The relative biological effectiveness (RBE) for gamma rays is 1.00. What is the number of gamma-ray photons absorbed by the technician in a workday?
A. 3 × 1010 B. 3 × 109 C. 3 × 108 D. 1 × 109 E. 1 × 108
The net work done in accelerating a propeller from rest to an angular velocity of 200 rad/s is 3 000 J. What is the moment of inertia of the propeller?
A 0.330-kg volleyball is thrown vertically downward with a speed of 0.150 m/s. It takes it 0.0655 s to reach the ground. What is the magnitude of its momentum just before it hits the ground?
A) 0.212 kg?m/s B) 0.262 kg?m/s C) 0.163 kg?m/s D) 0.0216 kg?m/s E) 0.0418 kg?m/s