I use a rope 3.50 m long to swing a 10.8-kg weight around my head. The tension in the rope is 8.25 N. In half a revolution how much work is done by the rope on the weight?
a. 28.9 J
b. 312 J
c. 25.5 J
d. 0 J
e. 0.218 J
d
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A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two second time. The acceleration of the ball in m/s2 is
a. 0 d. 6 b. 4.9 e. none of these c. 9.8
As the temperature of a blackbody increases, the peak of its radiation curve moves
a. upward toward higher intensity. b. downward toward lower intensity. c. toward larger wavelength. d. toward smaller wavelength. e. none of the above.
Which of the following numbers is the smallest?
A) 15 × 10-3 B) 0.15 × 100 C) 0.00015 × 103 D) 0.00000015 × 106
A 0.150-kW lamp is plugged into a 120-V ac wall outlet. What are (a) the peak current through the lamp, (b) the rms current through the lamp, and (c) the resistance of the lamp?
What will be an ideal response?