A ____ generally contains well over 1000 galaxies and is quite dense. They often contain many giant elliptical galaxies
a. local group
b. poor cluster
c. rich cluster
d. tidal tail
e. quasar
C
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If two stars are emitting the same amount of light, the star that is farther will appear
a. brighter. b. dimmer. c. redder. d. bluer. e. They will have the same brightness as seen from Earth.
The luminosity (L) of a star is the total energy the star radiates in _______________
Fill in the blank(s) with correct word
Power: A 25-W soldering iron runs on 110 V dc. What is its resistance?
A. 0.0020 ? B. 4.4 ? C. 0.48 k? D. 2.8 k?
The three blocks shown are released from rest and are observed to move with accelerations that have a magnitude of 1.5 m/s2. What is the magnitude of the friction force on the block that slides horizontally? Disregard any pulley mass or friction in the pulley and let M = 2.0 kg
a.
6.0 N
b.
5.1 N
c.
5.5 N
d.
4.6 N
e.
3.7 N