Which have the longest wavelengths when traveling in a vacuum?
A) radio waves
B) light
C) X-rays
D) all the same
Answer: A
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Standing Waves on a String: A stretched string is observed to have four equal segments in a standing wave driven at a frequency of 480 Hz. What driving frequency will set up a standing wave with five equal segments?
A. 600 Hz B. 360 Hz C. 240 Hz D. 120 Hz
What is the frequency (in Hz) of a wave whose displacement is given y = 0.5 sin(0.20x + 120t), where x and y are in cm and t in seconds?
A) 0.5 Hz B) 19. Hz C) 120 Hz D) 10 Hz E) 0.120 kHz
An inventor wants you to finance construction of a machine that will run at room temperature by using the free thermal energy available in the air itself. Should you invest $100,000? Why or why not?
What will be an ideal response?
A thin rod of mass M and length L is struck at one end by a ball of clay of mass m, moving with speed v as shown in the figure. The ball sticks to the rod. After the collision, the angular momentum of the clay-rod system about A, the midpoint of the rod, is
a.
(m + M/3)(vL/2)
b.
(m + M/12)(vL/2)
c.
(m + M/6)(vL/2)
d.
mvL/2
e.
mvL