A sprinter named Ben has challenged a beam of light to a race in the 100-meter dash. The race is held in a stadium full of spectators. At the start signal, a laser beam is turned on at the start line, pointed down the track
At the same instant, Ben bursts out of the starting blocks at 99% of the speed of light (0.99c). According to the spectators watching in the stands, what happens? (Assume they could somehow watch a slow-motion replay to see what occurred.) A) The light beam wins the race, but barely—it is going 1% of the speed of light faster than him.
B) The light beam instantly finishes the race, before Ben even has a chance to start.
C) The light beam wins the race by a large margin because it is going faster than him by the full speed of light.
D) Ben beats the light beam to the finish line, becoming a hero.
A
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A sticky hockey puck slides along a frictionless, horizontal ice surface at 75 m/s in the +x direction. It collides with a second sticky puck originally sliding at 25 m/s in the -y direction. They collide totally inelastically. If the first puck has a mass equal to twice that of the second, what is the angle of their final velocity vector below the +x direction?
A. 37 degrees B. 9.5 degrees C. 49 degrees D. 42 degrees E. 34 degrees
The four fundamental forces are
A) strong force, weak force, electromagnetic force, and gravity. B) strong force, weak force, electric force, and magnetic force. C) nuclear force, electromagnetic force, gravity, and tidal force. D) nuclear force, gravity, electric force, and magnetic force.
A particular automobile operates at an efficiency of 10%. Suppose that 20 gallons of gasoline are put into the auto's tank. Of this 20 gallons, how much will be "wasted" , i.e
, how much will be consumed to produce exhaust heat and in other ways that do not actually get the car down the road? A) 18 gallons B) 2 gallons C) 20 gallons D) 10 gallons E) 19 gallons
You are originally 1.0 m beneath the surface of a pool. If you dive to 2.0 m beneath the surface, what happens to the absolute pressure on you?
A) It quadruples. B) It more than doubles. C) It doubles. D) It less than doubles. E) It does not change.