How many moons is Pluto known to have?
A) none B) three C) one D) four E) two
B
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Entropy: An irreversible engine operating between the temperatures of 550 K and 300 K extracts 1.20 kJ of heat from the hot reservoir and produces 0.450 kJ of work. How much entropy is created in the process?
A. 0.32 J/K B. 0.68 J/K C. 0.44 J/K D. 0.73 J/K E. 0 J/K
The speed of sound in air at 0
is 331 m/s. What is the velocity of sound in air at a temperature of 30
?
A. 336 m/s B. 338 m/s C. 340 m/s D. 342 m/s E. 349 m/s
In what part of spiral galaxies do new stars form?
A) In the bulge. B) In the spiral arms. C) No new stars are forming anywhere. D) In the halo. E) No new stars form inside spirals. They form outside the galaxy and are pulled in.
A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse it has received from the gravitational force is
A.
s.B.
s.C.
s.D.
s.E.
s.