The pattern of hot convective cells rising in the photosphere is called
A) aurora.
B) prominences.
C) granulation.
D) flares.
E) sunspots.
C
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A 9.0-kg hanging weight is connected by a string over a pulley to a 5.0-kg block sliding on a flat table. If the coefficient of sliding friction is 0.19, find the tension in the string
?
?
a.
59.0 N
b.
67.5 N
c.
20.7 N
d.
37.5 N
If gold were always sold by weight, could you make money buying gold at one altitude above the ground and selling it at a different altitude?
A) Yes, you could make money by buying gold at a lower altitude and selling it at a higher altitude. B) Yes, you could make money by buying it at either a lower or higher altitude, and then selling it at the other altitude. C) Yes, you could make money by buying gold at a higher altitude and selling it at a lower altitude. D) No, you couldn't make any money this way because the mass of the gold would be the same at both altitudes. E) No, you couldn't make any money this way because the weight of the gold would be the same at both altitudes.
A car is moving down a straight, steep hill. By applying the brake, the driver is able to keep the speed of the car constant. Which of the following statements is true in this situation?
A. The net acceleration is positive. B. There is a net force on the car. C. The net acceleration is negative. D. There is no net force on the car.
Helium originates from
A) stellar nucleosynthesis only. B) the Big Bang only. C) mostly from stellar nucleosynthesis with a small contribution from the Big Bang. D) radioactive decay of elements heavier than carbon. E) mostly from the Big Bang with a small contribution from stellar nucleosynthesis.