A uniform disk with mass M and radius R sits at rest on an incline 30° to the horizontal. A string is wound around disk and attached to top of incline as shown. The string is parallel to incline. The friction force acting at the contact point is:
3
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How do we know that halo stars are older, on average, than disk stars?
A) Halo stars orbit in random directions but disk stars have more ordered orbits. B) There are no blue halo stars. C) There are no red disk stars. D) Theories of galaxy formation tell us that the halo formed earlier than the disk. E) We see evidence for new stars forming in the disk today.
A ball rolling down a hill has a constant acceleration of 3 m/s2 . If the ball's mass is 2.5 kg, what is the net force acting on the ball?
In a common dc circuit, electrons typically move at the speed of
A) a fraction of a centimeter per second. B) a few meters per second. C) sound. D) light. E) none of the above
The _____ is a geologically brief period about 540 million years ago during which fossil evidence indicates Earth life became complex and diverse
A) Cambrian explosion B) Paleozoic era C) Renaissance D) Ordovician