A 20.0-L pressure vessel holds 2.00 mol of oxygen at 30°C. What is the pressure inside the vessel? (R = 8.31 J/mol ? K)
A) 101 Pa
B) 101 kPa
C) 1.01 MPa
D) 2.52 MPa
E) 252 kPa
E
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The boat that will sail fastest in the intended direction is
1) 1, 2) 2, 3) 3, 4) 4, and the boat that responds least to the wind is 5) 1. 6) 2. 7) 3. 8) 4.
What two things do we need to measure in order to determine a star's luminosity?
A) apparent brightness and distance B) distance and mass C) apparent brightness and temperature D) apparent brightness and mass
Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a frictionless horizontal surface. The vertically hanging mass is 6.00 kg and the mass on the horizontal surface is 4.00 kg. The acceleration of the 4.00 kg mass is
A. 1.98 
B. 3.92
C. 5.88
D. 6.75
E. 7.84
The darkness of the night sky in an infinite universe is addressed in
A) Steady State Physics. B) the Cosmological principle. C) General Relativity. D) Special Relativity. E) Olbers's paradox.