What is the intensity of sound from a band with a sound level of 120 dB? (I0 = 10-12 W/m2)
a. 1 W/m2
c. 10 W/m2
b. 1.2 W/m2
d. 12 W/m2
A
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A simple pendulum, 2.00 m in length, is released from rest when the support string is at an angle of 35.0° from the vertical. What is the speed of the suspended mass at the bottom of the swing? (g = 9.80 m/s2 and ignore air resistance)
a. 0.941 m/s c. 2.66 m/s b. 1.88 m/s d. 1.33 m/s
A heat engine with an efficiency of 30.0% performs 2500 J of work. How much heat is discharged to the lower temperature reservoir?
A) 5830 J B) 8330 J C) 750 J D) 1350 J E) 7080 J
The greenhouse effect is occurring because
a. the ozone layer is being depleted. b. the amount of carbon dioxide in the atmosphere is increasing. c. the ionosphere reflects low frequency radiation. d. more ultraviolet radiation is penetrating the atmosphere. e. none of the above.
A cylindrical wire of radius 2.0 mm carries a current of 2.5 A. The potential difference between points on the wire that are 46 m apart is 3.7 V
(a) What is the electric field in the wire? (b) What is the resistivity of the material of which the wire is made?