What do sunspots tell us about the Sun's rotation rate?
What will be an ideal response?
Watching and timing sunspots as they travel across the Sun's face allows us to measure the rotation rate and determine it does not rotate as a solid body. It experiences differential rotation with different rates near the poles and equator.
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Two tanks of gas, one of hydrogen, H2, and one of helium, He, contain equal masses of gas. The gram-molecular mass of He is twice that of H2. Both tanks of gas are at the same temperature, 293 K. Which statement(s) below is(are) correct when we ignore vibrational motion?
A. The total internal energy of the hydrogen is the same as that of the helium. B. The total internal energy of the hydrogen is 167 times that of the helium. C. The total internal energy of the helium is 1.67 times that of the hydrogen. D. The total internal energy of the hydrogen is 3.33 times that of the helium. E. The total internal energy of the helium is 3.33 times that of the hydrogen.
Rank these times based on the wavelength of the peak intensity of the cosmic background radiation at those times, from shortest to longest. (Hint: consider how the temperature of the universe or the cosmic background radiation changed with time.)
A) today, 1 million years after the Big Bang, 100 million years after the Big Bang B) 100 million years after the Big Bang, 1 million years after the Big Bang, today C) today, 100 million years after the Big Bang, 1 million years after the Big Bang D) 1 million years after the Big Bang, 100 million years after the Big Bang, today
If an object's mass decreases while a constant force acts on it, the acceleration
A) decreases. B) remains the same. C) increases. D) will be zero.
Which is a unit of power?
a. kWh b. W/s c. A?? d. J/s