Power: A light bulb operating at a dc voltage of 120 V has a resistance of 200 ?. How much power is dissipated in this bulb?
A. 100 W
B. 60 W
C. 72 W
D. 14 mW
E. 7.2 W
Answer: C
You might also like to view...
The chemical abundance of population I stars
a. indicates that they were formed before the population II stars. b. indicates that the material they formed from had been enriched with material from supernovae. c. indicates that they contain very few heavy metals compared to halo stars. d. depends on the temperature of the star. e. depends on the mass of the star.
An object is acted on by a drag force with a magnitude that is proportional to the speed. The object accelerates downward at 3.00 m/s2 when it is falling with a speed 20.0 m/s. What is the terminal speed of the object as it is falling?
A) 38.1 m/s B) 55.9 m/s C) 28.8 m/s D) 65.4 m/s E) 43.2 m/s
Which star has the largest diameter?
a. white dwarf b. main sequence c. red giant d. supergiant e. regular giant
A point charge (?5.0 ?C) is placed on the x axis at x = 4.0 cm, and a second charge (+5.0 ?C) is placed on the x axis at x = ?4.0 cm. What is the magnitude of the electric force on a third charge (+2.5 ?C) placed on the y axis at y = 3.0 cm?
A. 90 N B. 45 N C. 54 N D. 72 N E. 36 N