Four resistors of 12, 3.0, 5.0, and 4.0 ? are connected in parallel. A 12-V battery is connected to the combination. What is the current through the battery?
A)
10 A
B)
5.0 A
C)
2.5 A
D)
0.50 A
E)
0.25 A
A
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The temperature variations of the cosmic microwave background observed by Planck agrees well with our model predictions. This provides persuasive evidence in favor of what?
A) both the Big Bang and inflation B) only the Big Bang, but not inflation C) not the Big Bang, but inflation D) neither the Big Bang nor inflation
A nearsighted person has her distant vision corrected using a -2.0-diopter contact lens. Her uncorrected near point is 15 cm. What is her near point using this lens if the lens is 2.0 cm from the eye?
A) 17 cm B) 20 cm C) 13 cm D) 18 cm E) 15 cm
What wavelength (in ?m) is associated with the Paschen series for n = 4? (RH = 1.097 × 10^7 m?1)
a. 320 b. 530 c. 2.7 d. 1.9 e. 0.5
A 3.0-kg block is on a horizontal surface. The block is at rest when, at t = 0, a force (magnitude P = 12 N) acting parallel to the surface is applied to the block causing it to accelerate. The coefficient of kinetic friction between the block and the surface is 0.20 . At what rate is the force P doing work on the block at t = 2.0 s?
a. 54 W b. 49 W c. 44 W d. 59 W e. 24 W