A 60.0-Hz AC generator with a peak voltage of 110 V drives a series RL circuit with R = 10.0 ? and L = 10.0 mH. The power factor, cos ?, is
A. ?1.00.
B. ?0.936.
C. +0.943.
D. +0.936.
E. +1.00.
Answer: D
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A 2.0-kg object moving with a velocity of 5.0 m/s in the positive x direction strikes and sticks to a 3.0-kg object moving with a speed of 2.0 m/s in the same direction. How much kinetic energy is lost in this collision?
a. 2.4 J b. 9.6 J c. 5.4 J d. 0.6 J e. 6.0 J
When the reflection of an object is seen in a plane mirror, the distance from the mirror to the image depends on:
a. the distance from the object to the mirror. b. the size of the object. c. the distance of both the observer and the object to the mirror. d. the wavelength of light used for viewing.
Energy utilization appears to be
A) a sufficient condition, but not a necessary condition for life B) both a necessary condition and a sufficient condition for life C) neither a necessary condition nor a sufficient condition for life D) a necessary condition, but not a sufficient condition for life
The observation that there are asteroids made entirely of rock or entirely of iron suggests that ________.
A. large planetesimals formed entirely out of the same material B. these asteroids were formed from volcanic eruptions on early planets C. asteroids made of both rock and iron are particularly fragile and are easily destroyed D. the early Solar System had intermediate-sized differentiated planetesimals