If the net torque on a body is zero, the net force on the body is
A. always zero.
B. certainly not zero.
C. not necessarily zero.
Answer: C
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Constant Angular Acceleration: A machinist turns on the power on to a grinding wheel at time t = 0 s. The wheel accelerates uniformly from rest for 10 s and reaches the operating angular speed of 96 rad/s. The wheel is run at that angular velocity for 40 s and then power is shut off. The wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. For how long a time after the power is shut off does it take the wheel to stop?
A. 64 s B. 62 s C. 66 s D. 68 s E. 70 s
The lowest tone to resonate in a pipe of length L that is closed at one end but open at the other end is 200 Hz. Which one of the following frequencies will not resonate in that pipe?
A) 200 Hz B) 400 Hz C) 600 Hz D) 1000 Hz E) 1400 Hz
Future space stations will create an artificial gravity by rotating. Consider a cylindrical space station of 380 m diameter rotating about its axis. Astronauts walk on the inside surface of the space station
What rotation period will provide "normal" gravity? A) 28 s B) 39 s C) 6.2 s D) 4.4 s
A negative ion is moving east near the equator where the Earth's magnetic field is horizontal to the north. The direction of the magnetic force on the ion is
A. north. B. south. C. up. D. down. E. not meaningful since the force is zero.