A car was moving 110. km/hour
(a) How long did it take to go 25.5 miles?
(b) If it stopped in 35. s, what was its average acceleration (m/s2 ) as it slowed down?
(a) 22.4 min
(b) -0.87 m/s2
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Similar to our Sun, pulsars' rotations are believed to slow down because
a. they are losing angular momentum into space via outward streaming particles. b. they are dragging companion stars around in their magnetic field. c. they are getting tired. d. of conservation of angular momentum. e. their mass is increasing.
Suppose you want to know the chemical composition of a distant star. Which piece of information is most useful to you?
A) The peak energy of the star's thermal radiation. B) The Doppler shift of the star's spectrum. C) The wavelengths of spectral lines in the star's spectrum. D) Whether the star's spectrum has more emission lines or more absorption lines.
A satellite near Earth makes a full circle in about 90 minutes. Much farther from Earth, say at the distance to the Moon, time for a full circle would be
A) 90 minutes. B) less than 90 minutes. C) about 28 days. D) not enough information E) none of the above
If you wish to keep chicken warm in a shed on a cold night, the best lamp to use is
A) an incandescent lamp. B) a fluorescent lamp. C) an LED lamp. D) a CFL lamp.