How far does a beam of light travel in 2.0 ms? (c = 3.0 × 108 m/s)
A) 6.0 × 105 m
B) 0.66 × 105 m
C) 90 m
D) 70 m
E) 60 m
A
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Which of the following statements best explains why the densities of Uranus and Neptune are higher than that of Saturn, even though Saturn is much more massive?
a They have higher masses. b. They have a higher proportion of hydrogen compounds and rock. c. They have stronger magnetic fields. d. They are at greater distances from the Sun. e. Their interiors are more compressed due to stronger gravity.
Figure 4–53 shows a block (mass mA) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second block which hangs vertically.
(a) Draw a free-body diagram for each block, showing the force of gravity on each, the force (tension) exerted by the cord, and any normal force.
(b) Apply Newton’s second law to find formulas for the acceleration of the system and for the tension in the cord. Ignore friction and the masses of the pulley and cord.
The current through a 10-ohm resistor connected to a 120-V power supply is
A) 1 A. B) 10 A. C) 12 A. D) 120 A. E) none of the above
What area plates would a parallel plate 1.0 F capacitor have with a plate separation of 0.10 mm and a dielectric of constant 10?
A. 1000
B. 5500
C. 130 
D. 
E. 