When a 60-W lightbulb is operating on a 120-V household line, what current does it draw?
A)
0.5 A
B)
120 J/C
C)
2.0 A
D)
1.414 A
E)
40 J/C
A
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A 1.00-kg ball has zero kinetic and potential energy. Ernie drops the ball into a 10.0-m-deep well. Just before the ball hits the bottom, the sum of its kinetic and potential energy is:
a. zero. b. 98.0 J. c. ?98.0 J. d. 196 J. e. ?196 J.
A baseball is thrown and lands 120 m away. While the ball is in flight, assuming the effect of air friction is negligible, which of the following is true?
A. At maximum height the ball has its greatest kinetic energy. B. The horizontal component of the baseball's kinetic energy is constant. C. The vertical component of the baseball's kinetic energy is constant. D. The mechanical energy of the baseball is greater when nearer to the ground. E. No answer above is correct.
Which has the larger resistance, a 60-W or a 100-W incandescent lamp, both rated for 120-V operation?
A) 60-W lamp B) 100-W lamp C) both the same
Which are the two planets without a moon?
a. Mercury and Venus b. Venus and Mars c. Mars and Uranus d. Uranus and Neptune