The "helium flash" occurs at what stage in stellar evolution?
A) when the T Tauri bipolar jets shoot out
B) in the middle of the main sequence stage
C) red giant
D) horizontal branch
E) planetary nebula
C
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A compact disk rotates at 210 revolutions per minute. What is its angular speed in rad/s?
A) 11.0 rad/s B) 22.0 rad/s C) 45.3 rad/s D) 69.1 rad/s E) 660 rad/s
The Babcock model employs differential rotation of the solar surface and a magnetic dynamo to describe the formation of sunspots
a. True b. False Indicate whether the statement is true or false
The Sun's mass and volume are over a million times that of our Earth
Indicate whether the statement is true or false
When you drag a toy teddy bear along the floor by a force that is parallel to the floor, the magnitude of the force of friction
A. is independent of velocity or acceleration. B. increases when the velocity increases. C. is proportional to the acceleration. D. decreases when the force parallel to the floor increases. E. increases when the force parallel to the floor increases.