High-mass stars fuse hydrogen into helium through the CNO cycle rather than solely by the proton-proton chain. Which property of the CNO cycle explains why high mass stars have much shorter lives than low mass stars?
A) The CNO cycle is only possible when the abundance of CNO elements is very high.
B) The CNO cycle is very fast at converting hydrogen to helium.
C) The CNO cycle is very fast at converting hydrogen to carbon, nitrogen, oxygen (CNO).
D) The CNO cycle is only possible when the star has lived for a very long time.
B) The CNO cycle is very fast at converting hydrogen to helium.
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A 50-N object falling in air experiences 50 N of air resistance. The amount of net force on the falling object is?
A. 0 N B. 25 N C. 50 N D. 100 N
Consider a system containing three objects that move with different velocities. The objects can interact with each other through forces. In this system
A. the objects can only collide if an outside force is applied. B. any collisions between the objects must be elastic. C. the total momentum of the objects cannot change unless an outside force acts on the system. D. the total kinetic energy of the objects will not change unless an outside force is applied.
From the viewpoint of an alien astronomer, how does Jupiter affect observations of our Sun?
A) It causes the Sun to move in a small ellipse with an orbital period of about 12 years. B) It makes the Sun periodically get somewhat brighter. C) It makes the Sun appear dimmer when viewed with infrared light. D) It causes the Sun to move in a small ellipse in the sky, with the same ellipse repeated every night.
The vertical displacement y(x,t) of a horizontal string aligned along the x-axis is given by the equation y(x,t) = (6.00 mm) cos[(3.25 m-1)x - (7.22 s-1)t]. What are the (a) speed and (b) amplitude of this wave?
What will be an ideal response?