When energy flows as heat from a hotter object to a colder one:
a. the kinetic energy of microscopic particle motions in the hotter object decreases.
b. the kinetic energy of microscopic particle motions in the hotter object increases.
c. only thermal energy changes in each object; kinetic energy remains the same.
d. it does work on the colder object.
e. the kinetic energy of microscopic particle motions in both objects increases.
a
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Two forces act on a 4.00-kg object in a manner that the object has an acceleration 3.00 m/s2 in a direction 20.0° north of east. The first force is 15.00 N in a direction 10.0° west of north. What is the second force?
A) 14.6 N in a direction 28.1° south of east B) 12.9 N in a direction 28.1° south of east C) 16.2 N in a direction 30.2° south of east D) 18.8 N in a direction 41.1° south of east E) 17.5 N in a direction 37.5° south of east
The speed of light in a material is 1.74 × 10^8 m/s. What is the index of refraction of this material?
a. 1.72 b. 0.58 c. 1.74 d. 0.218
A spiral (S or SB) galaxy contains
a. mostly lower-main sequence stars and giants. b. mostly upper main sequence stars and giants. c. mostly upper main sequence stars and gas and dust. d. upper and lower main sequence stars and gas and dust. e. mostly white dwarfs and supergiants.
One mole of an ideal gas with a volume of 4.00 liters and a temperature of 0
is mixed with one mole of an ideal gas with a volume of 2.00 liters and a temperature of 100
The volume of the mixture is 6 liters. What is the N/V of the mixture?
a. 
b. 
c. 
d. 
e. 