Which types of galaxies have a clearly defined halo component?
A) spirals only
B) ellipticals only
C) lenticulars only
D) irregulars only
E) all but irregulars
E
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A Carnot engine operates between reservoirs at 550K and 300K, discarding 1500 J of heat in each cycle
(a) What is the engine's efficiency? (b) How much heat is supplied to the engine by the hot reservoir in each cycle? What will be an ideal response?
What is the symbol for a photon?
a. n b. c. d. none of the above
A test rocket is fired straight up from rest with a net acceleration of 20.0 m/s2. After 4.00 seconds the motor turns off, but the rocket continues to coast upward with no appreciable air resistance
What maximum elevation does the rocket reach? A) 327 m B) 487 m C) 160 m D) 408 m E) 320 m
An acceleration may result from
a. a change in speed. b. a change in direction. c. a change in both speed and direction. d. all of these