A sealed container holds 0.020 moles of ideal nitrogen (N2 ) gas, at a pressure of 1.5 atm and a temperature of 290 K
The atomic mass of nitrogen is 14.0 g/mol. How many molecules of nitrogen are in the container? (R = 8.31 J/mol ? K, 1 atm = 101 kPa)
A) 1.5 × 1021 mol
B) 3.0 × 1021 mol
C) 6.0 × 1021 mol
D) 1.2 × 1022 mol
E) 2.4 × 1022 mol
D
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In pre-Copernican astronomy, it was almost universally believed that
a. the planets traveled in elliptical orbits about the Earth. b. the center of the universe was the Sun with the Milky Way representing other distant planets. c. the Sun was at the center of the universe. d. the Earth was at the center of the universe. e. None of the above was believed.
Three charges are placed as follows along the x- and y-axes of an xy-coordinate system: q1 = 2.00 ?C at x1 = 0 m, q2 = 4.00 ?C at x2 = 3.00 m, and q3 = 6.00 ?C at y = 4.00 m. What is the electric potential energy of this system of charges?
A) -94.2 mJ B) 94.2 mJ C) 0 J D) -90.0 mJ E) 90.0 mJ
Two people, one twice as massive as the other, attempt a tug-of-war with 12 m of rope on frictionless ice. After a brief time, they meet. The heavier person slides a distance of
A) 3 m. B) 4 m. C) 5 m. D) 6 m.
A disturbance in particle motion perpendicular to the wave velocity is called a
a. transverse wave. b. acoustic wave. c. standing wave. d. longitudinal wave.