General Questions: A small car and a large SUV are at a stoplight. The car has a mass equal to half that of the SUV, and the SUV can produce a maximum accelerating force equal to twice that of the car. When the light turns green, both drivers push their accelerators to the floor at the same time. Which vehicle pulls ahead of the other vehicle after a few seconds?
A. The car pulls ahead.
B. The SUV pulls ahead.
C. It is a tie.
Answer: C
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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
The secondary rainbow is dimmer than the primary rainbow because
A) its colors are inverted. B) it is larger, and its energy spreads across more area. C) it is farther from the viewer. D) it simply has much less energy than the primary bow. E) of a double reflection and refraction in the drops.
Which of the following is true of poor galaxy clusters?
A) They contain about 1500 to 2500 galaxies. B) They primarily contain elliptical galaxies. C) They are densely crowded toward the center. D) They are irregularly shaped.
The magnetic field of an electromagnetic wave has a peak value of 5.0 × 10-10 T
What is the intensity of the wave? (c = 3.0 x 108 m/s, c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 1.0 × 10-13 W/m2 B) 1.5 × 10-5 W/m2 C) 3.0 × 10-5 W/m2 D) 2.0 × 10-13 W/m2 E) 7.5 × 105 W/m2