If a 2100-kg car was moving at 30 m/s, what would be its kinetic energy expressed in the unusual (for kinetic energy) units of calories? (1 cal = 4.186 J)
a. 3.0 × 10^4
c. 3.8 × 10^6
b. 2.3 × 10^5
d. 1.1 × 10^5
B
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A quasar's spectrum is hugely redshifted. What do most astronomers think this large redshift tells us about the quasar?
A) the composition of the quasar B) the distance to the quasar C) the size of the quasar's central, supermassive black hole D) the type of host galaxy in which the quasar resides
A solenoid with 400 turns has a radius of 0.040 m and is 40 cm long
If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field near the center of the solenoid? (?0 = 4? × 10-7 T ? m/A) A) 16 mT B) 4.9 mT C) 15 mT D) 6.0 mT E) 9.0 mT
A spaceship with a constant speed of 0.800c relative to Earth travels to a star that is 4.30 light-years from Earth. How much time for this trip would elapse on a clock on board the spaceship?
A) 3.23 y B) 5.38 y C) 4.40 y D) 5.15 y
Earth's lower atmosphere is warm because of
A) incoming solar radiation. B) terrestrial radiation. C) cloud cover. D) outgoing short-wave radiation.