When the rate of burn and the exhaust velocity are constant, a rocket ascends with
a. decreasing acceleration.
b. decreasing velocity.
c. constant velocity.
d. constant acceleration.
e. increasing acceleration.
e
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The difference between donor and acceptor atoms in a doped semiconductor is that
a. the donor energy level lies halfway between the valence band and the acceptor level. b. the donor energy level lies near the valence band and the acceptor energy level lies near the conduction band. c. donor energy levels cannot exist unless acceptor energy levels are present. d. the donor energy level lies near the conduction band and the acceptor energy level lies near the valence band. e. the acceptor energy level lies halfway between the conduction band and the donor energy level.
Boat 1 goes directly across a stream a distance L and back taking a time t1 . Boat 2 goes down stream a distance L and back taking a time t2 . If both boats had the same speed relative to the water, which of the following statements is true?
a. t2 > t1 b. t2 < t1 c. t2 = t1 d. t2 = 2t1 e. t2 = 0.5t1
Two thin slits are 6.00 ?m apart. Monochromatic coherent light falls on these slits, and produces a fifth-order bright interference fringe at an angle of 32.3° away from the centerline
What is the wavelength of the light? A) 416 nm B) 641 nm C) 164 nm D) 614 nm
We want to determine experimentally the specific heat of a 3-gram iron ingot whose mass is known. The ingot is heated to 100°C and it is placed in a 200-gram sample of water whose initial temperature is 20°C. We would expect the final temperature of the water to be around
1.100°C. 2.70°C. 3.40°C. 4.20°C.