George Gamow, the creator of the Big-Bang theory of the origin of the universe, asks you to imagine what would happen if the speed of light was 15. mi/h
If you were on the sidewalk looking at a bicyclist ride down the street, how does she look to you while riding, compared to when she stops? A) taller, the same mass, but stretched out like a limousine
B) shorter, the same mass, but stretched out like a limousine
C) same height, greater mass, and flatter in the direction she is moving
D) same height, smaller mass, and flatter in the direction she is moving
E) shorter, greater mass, but stretched out like a limousine
C
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A dump truck has a large cubical concrete block in its bed. The coefficients of friction between this block and the floor of the bed are µk = 0.450 and µs = 0.650
As the bed is slowly tilted above the horizontal, will the brick first begin to slide or will it first tip over? A) It will first tip over. B) It will first begin to slide. C) It will tip over just as it begins to slide. D) It is impossible to answer without knowing the mass of the block. E) It is impossible to answer without knowing the dimensions of the block.
The fastest we could accelerate a vehicle powered with an ion engine to is approximately
A) 1% of the speed of light B) 0.001% of the speed of light C) 0.1% of the speed of light D) 10% of the speed of light
A car moving at a steady 10 m/s on a level highway encounters a depression that has a circular cross-section with a radius of 30 m. The car maintains its speed as it drives through the depression
What is the normal force exerted by the seat of the car on a 60.0-kg passenger when the car is at the bottom of the depression? A) 200 N B) 390 N C) 790 N D) 490 N E) 590 N
A student finds two ancient meters with numbered scales but no unit markings. He thinks that one is an ammeter and one is a voltmeter but doesn't know which is which. He measures the resistance of each, finding that meter A has a resistance of 5000 ohms and meter B has a resistance of 0.10 ohm. He can conclude that
A. A is the voltmeter and B is the ammeter. B. B is the voltmeter but A cannot be a useful meter. C. A is the voltmeter but B cannot be a useful meter. D. B is the voltmeter and A is the ammeter. E. neither can be a useful meter.