A hollow steel ball of diameter 3.0 m just barely floats in water. What is the wall thickness of the ball? (?Fe = 7.87 g/cm3, ?water = 1.00 g/cm3)
A) 6.6 cm
B) 37 cm
C) 131 cm
D) 79 cm
A
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Describe the difference between a solar system and a galaxy
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Why is there a limit to how much compression can be counterbalanced by electron degeneracy pressure?
A) At extreme compression, the electron speeds approach the speed of light and therefore cannot increase further. B) At extreme compression, electrons are forced to stop moving, and once stopped there is nothing more they can do. C) At extreme compression, atoms are fully ionized so that electrons go free and can no longer exert pressure. D) Because electrons are small, they are simply incapable of exerting much pressure.
When a low-mass star runs out of hydrogen in its core, it gets brighter. Why?
What will be an ideal response?
According to the postulates of special relativity
A. the speed of light as measured by a stationary observer is the same as the speed of light measured by someone moving toward the light. B. Newton's laws do not apply for objects moving at high speeds. C. light can move faster when it moves with the luminiferous ether. D. it is impossible for an object to move faster than the medium it is moving through.