A rocket speeding by the Earth is known, when at rest, to be roughly cylindrical with a radius of 15 m and a length of 150 m. When speeding by, its volume is measured to be 
What is its speed?
A. 0.917c
B. 0.774c
C. 0.678c
D. Insufficient information is given.
A. 0.917c
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All dark matter in our Universe falls into the category of "hot dark matter"
a. True b. False Indicate whether the statement is true or false
Two wires, each having a weight per unit length of 1.0 × 10?4 N/m, are strung parallel, one 0.10 m above the other. If the wires carry the same current, though in opposite directions, how great must the current in each wire be for the magnetic field of the lower conductor to balance the weight of the upper conductor?
What will be an ideal response?
Suppose that you are isolated and "floating" in outer space and that you hold a wooden block and a lead block, one in each hand, and that the two blocks look and feel identical. How could you tell which one is the lead block?
A) Give each one a light tap with your finger; the one that accelerates the least is the lead block. B) Let go of them; the one that falls the fastest is the lead block. C) Give each one a light tap with your finger; the one that accelerates the most is the lead block. D) None of the above methods could tell you which block is the lead block.
If you double the pressure on the surface of a can of water, the buoyant force on a stone placed in that water will
A) decrease, but not by one-half. B) increase, but not double. C) not change. D) double.