as a star becomes a giant, its outer layers are expanding. where does the energy for expanding these layers come from?
What will be an ideal response?
from the fusion of hydrogen into helium in a shell around the core
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Which of the following is a difference between Saturn and Jupiter?
A) Unlike Jupiter, Saturn is rich in hydrogen and helium. B) Saturn has more liquid metallic hydrogen than Jupiter. C) Belts and zones on Saturn are less visible than on Jupiter. D) Unlike Jupiter, Saturn radiates more energy than it receives.
A ball is released from rest on a no-slip surface, as shown in the figure. After reaching its lowest point, the ball begins to rise again, this time on a frictionless surface as shown in the figure
When the ball reaches its maximum height on the frictionless surface, it is A) at a greater height than when it was released. B) at a lesser height than when it was released. C) at the same height as when it was released. D) It is impossible to tell without knowing the mass of the ball. E) It is impossible to tell without knowing the radius of the ball.
An astronaut floating alone in outer space throws a baseball. If the ball moves away at 20 m/s, the astronaut will move in the opposite direction at
A) 20 m/s. B) a lower speed. C) a higher speed. D) more information needed E) none of the above
Lithium is a good material to use for a possible fusion reactor because it is so easy to handle chemically
What will be an ideal response?