What two energy transport mechanisms, in order from outside the core to the surface, is found in the Sun?
A) Convection, conduction
B) Fadiative diffusion, convection
C) Conduction, radiative diffusion
D) Fadiative diffusion, conduction
E) Conduction, convection
B
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An electric device delivers a current of 5.0 A to a device. How many electrons flow through this device in 10 s? (e = 1.60 × 10-19 C)
A) 0.20 B) 20 C) 2.0 D) 3.1 × 1020 E) 31 × 1020
Venus and Mars probably evolved differently from Earth because:
A) they are slightly bigger than Earth. B) they are more massive than Earth. C) they have thicker atmospheres than the Earth. D) they formed sooner than Earth. E) they orbit at different distances from the Sun.
Electrical forces between charges are strongest when the charges are
a. far apart b. close together c. the electrical force is constant everywhere
General Questions: A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s. The vector sum of all the forces acting on this crate must point
A. down the ramp. B. up the ramp. C. perpendicular to the ramp. D. vertically downward. E. None of these choices is correct.