Refer to the race described above. According to the spectators watching in the stands, what happens?
A) The light beam wins the race, but barely—it is going 1 percent of the speed of light faster than Ben.
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 Ben by the full speed of light.
D) Ben beats the light beam to the finish line, becoming a hero.
A
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Answer the following statement(s) true (T) or false (F)
1. The mass of the earth–moon system is somewhat less than the sum of the mass of the earth and the mass of the moon 2. If the activity of a radioactive sample has decreased by a factor of 4 in time T, then T = 2t1/2
A 958-N rocket is coming in for a vertical landing. It starts with a downward speed of 25 m/s and must reduce its speed to 0 m/s in 8.0 s for the final landing
(a) During this landing maneuver, what must be the thrust due to the rocket's engines? (b) What must be the direction of the engine thrust force?
A block is on a frictionless table, on earth. The block accelerates at 3.0 m/ when a horizontal force is exerted on it
The block and table are set up on the Moon, where the acceleration of objects due to the gravitational attraction is 1.62 m/ . The weight of the block on the Moon is closest to A) 11 N. B) 9.5 N. C) 8.1 N. D) 6.8 N. E) 5.5 N.
Which one of the following is an accurate statement about light?
A) When light strikes a surface at the critical angle, all the light passes through the surface. B) When light strikes a surface at the critical angle, only the reflected light is 100% polarized. C) When light strikes a surface at Brewster's angle, it is completely reflected at the surface. D) When light strikes a surface at Brewster's angle, only the reflected light is 100% polarized. E) When light strikes a surface at Brewster's angle, the reflected and transmitted light are both 100% polarized.