A cylinder of weight W1 5 150 lb is supported at two points, 1 and 2, as shown. Neglect friction at the two points of contact. Normal forces N1 and N2 are (in lb):
(A) 75, 130
(B) 130, 75
(C) 125, 150
(D) 75, 120
(A) 75, 130
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The Richter magnitude scale measures an earthquake's
A) frequency. B) energy in terms of ground shaking. C) damage. D) all of the above
A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west, and the total acceleration of the car is 2.5 m/s2 53° north of west. Which of the following is correct?
a. R = 0.29 km, and the car's speed is increasing. b. R = 0.23 km, and the car's speed is decreasing. c. R = 0.23 km, and the car's speed is increasing. d. R = 0.29 km, and the car's speed is decreasing. e. R = 0.29 km, and the car's speed is constant.
When you look at a single slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central maximum and a number of maxima on either side, their intensity decreasing with distance from the central maximum. If the width of the slit is decreased,
a. the pattern shrinks in size. (central maximum less wide; other maxima in closer to it) b. the pattern increases in size. (central maximum wider; other maxima farther from it) c. it does not affect the size of the pattern. d. the width of the central maximum increases, but the other maxima do not change in position or width. e. the width of the central maximum decreases, but the other maxima do not change in position or width.
If an interstellar gas cloud shrinks in size, what does the law of conservation of energy predict it will do?
A) heat up B) spin slower C) cool off D) continue shrinking E) spin faster