The SI units of acceleration are
a. mi/h
b. km/h
c. m/s
d. m/s2
e. none of the above
D
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The Hipparcos data give us
A) parallaxes to the nearest galaxies. B) parallaxes as small as 0.005". C) an accurate distance to the Moon. D) distances to about 100 billion stars, practically everything in the Milky Way Galaxy. E) information on only the 6,000 brightest stars.
Shoot a cannonball horizontally from a cannon at a mountain top and it gains speed as it falls and hits the ground below. But fire the cannonball fast enough for circular orbit and no change in speed occurs. Why?
What will be an ideal response?
The Tully-Fisher relation exists between the galaxy's luminosity and its
A) age. B) mass. C) size. D) rotation. E) color.
A mass on a spring vibrates in simple harmonic motion at a frequency of 4.26 Hz and an amplitude of 3.00 cm. If a timer is started when its displacement is a maximum (hence x = 3.00 cm when t = 0), what is the acceleration magnitude when t = 3.74 s?
a. zero b. 0.732 m/s2 c. 39.2 m/s2 d. 19.6 m/s2 e. 10.5 m/s2