Ideal Gas Law: A refrigerator has an interior volume of 0.500 m3. The temperature inside the refrigerator in 282 K, and the pressure is 101 kPa. If the molecular weight of air is 29 g/mol, what is the mass of air inside the refrigerator? (R = 8.31 J/mol × K)
A. 625 g
B. 513 g
C. 447 g
D. 329 g
E. 243 g
Answer: A
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The Big Bang is a theory describing the ____
a. birth of our Solar System b. start of civilization on Earth c. beginning of planet formation d. beginning of the Universe e. massive extinction of dinosaurs
How does the theory of planetary migration in disks possibly account for the highly eccentric orbits discovered for some extrasolar planets?
A) A migrating planet would create waves in the planet forming disk, which would in turn lead to the formation of planets on highly elliptical orbits. B) When migrating planets pass close enough for a gravitational encounter, one may be flung from the system while the other is shifted to a highly elliptical orbit. C) When migrating planets collide, they would move onto more eccentric orbits. D) When a planet migrates onto the surface of the star, the additional stellar mass would disrupt the orbits of the remaining planets.
A modern version of Joule's experiment has you turn a crank attached to an 85.0 g aluminum cylinder. A belt exerts a frictional torque on the cylinder of 1.50 Nm. The specific heat of aluminum is 900 J/(kg•K)
How many turns of the crank are necessary to raise the temperature of the aluminum by 40 C°? A) 325 B) 650 C) 900 D) 975 E) 1300
A mass of 5 kg is released from rest on a smooth incline making an angle of 37° to the horizontal. The radial component of acceleration is closest to: