What is the equivalent resistance between points A and B in the figure when R = 20 ??
A. 77 ?
B. 63 ?
C. 70 ?
D. 84 ?
E. 140 ?
Answer: C
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Momentum: A 0.330-kg volleyball is thrown vertically downward with a speed of 0.150 m/s in a place where g = 9.81 m/s2. 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
An object of mass m is attached to string of length L. When it is released from point A, the object oscillates between points A and B. Which statement about the system consisting of the pendulum and the Earth is correct?
A. The gravitational potential energy of the system is greatest at A and B. B. The kinetic energy of mass m is greatest at point O. C. The greatest rate of change of momentum occurs at A and B. D. All of the above are correct. E. Only (a) and (b) above are correct.
A student attaches a length of nylon fishing line to a fence post. She stretches it out and shakes the end of the rope in her hand back and forth to produce waves on the line. The most efficient way for her to increase the wavelength is to
a. increase the tension on the hose and shake the end more times per second. b. decrease the tension on the hose and shake the end more times per second. c. increase the tension on the hose and shake the end fewer times per second. d. decrease the tension on the hose and shake the end fewer times per second. e. keep the tension and frequency the same but increase the length of the hose.
The Large Hadron Collider (LHC) near Geneva, Switzerland is an example of a
A) synchrotron. B) cyclotron. C) linear accelerator. D) None of the above