A river flows toward the East at 2.2 m/s. Steve can swim 2.5 m/s in still water. If he wishes to cross the river so that his direction is northward, how long will it take him to cross the 75 m wide river?
A. 34 s
B. 39 s
C. 30 s
D. 63 s
D. 63 s
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If the tension, 
, is 15 N and the magnitude of the acceleration, a, is 3.0 m/s2, what is the mass, m, of the suspended object? Assume that all surfaces and the pulley are frictionless.
?
?
A. 3.1 kg B. 2.5 kg C. 2.8 kg D. 2.2 kg E. 3.7 kg
X-rays travel at a greater speed than radio waves
Indicate whether the statement is true or false
A conclusion that follows from E=mc2 is that, at the microscopic level,
A) matter is made of force fields. B) tiny indestructible pieces of matter move through empty space. C) there is only matter and antimatter. D) all matter must vibrate at the speed of light. E) matter is made of radiation.
What are the two most important properties of a telescope? Select exactly two responses.
A. light-collecting area B. retinal intensity C. angular resolution D. magnification