What does the granulation tell us about the layers below the photosphere?
What will be an ideal response?
Observations of granules show that their centers are rising and their edges are sinking. From this, astronomers recognize granulation as the surface effects of convection currents just below the photosphere.
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At what temperature would the rms speed of H2 molecules equal the earth's escape speed (11,200 m/s)?
A. 
K
B. 
K
C. 
K
D. 
K
Gravitational Potential Energy: Three masses are located as follows: a 3.0-kg mass is at the origin, a 4.5-kg mass at (0.0 m, 4.0 m) and a 2.5-kg mass at (3.0 m, 0.0 m). What is the gravitational potential energy of this system of masses? (G = 6.67 × 10-11 N ? m2/kg2)
A. -3.8 × 10-10 J B. -3.9 × 10-10 J C. -5.4 × 10-10 J D. -3.2 × 10-10 J E. -3.5 × 10-10 J
A rocket is moving at 1/4 the speed of light relative to Earth. At the center of this rocket, a light suddenly flashes. To an observer at rest on Earth,
A) the light will reach the front of the rocket at the same instant that it reaches the back of the rocket. B) the light will reach the front of the rocket before it reaches the back of the rocket. C) the light will reach the front of the rocket after it reaches the back of the rocket.
What is the percent uncertainty in the measurement 2.58 ± 0.15 cm?
A) 2.9% B) 5.8% C) 8.7% D) 12% E) 15%