How many molecules are in (a) 1.0 cm3 of air at STP and (b) 1.0 cm3 of helium at STP? (R = 8.31 J/mol . K, NA = 6.022 × 1023 molecules/mol)
What will be an ideal response?
2.7 × 1019 molecules in both cases
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A series circuit contains an 80-?F capacitor, a 0.020-H inductor, and a switch. The resistance of the circuit is negligible
Initially, the switch is open, the capacitor voltage is 50 V, and the current in the inductor is zero. At time t = 0 s, the switch is closed. When the potential across the capacitor is 30 V, what is the rate of change of the current? A) 1000 A/s B) 1500 A/s C) 2000 A/s D) 2500 A/s E) 3000 A/s
Pulsars slow their pulse rate because:
a. they convert energy of rotation into radiation. b. they drag companion stars around, causing them to slow. c. of friction with the interstellar medium. d. of the conservation of angular momentum.
How will high tides differ from their average values when the Moon and the Sun are on the same side of Earth?
A. They will be higher than average. B. They will be lower than average. C. They will not differ from average values significantly. D. There are no high tides when the Moon is near the Sun in the sky.
Two solenoids of equal length are each made of 2000 turns of copper wire per meter. Solenoid I has a 5.00-cm radius; solenoid II a 10.0-cm radius. When equal currents are present in the two solenoids, the ratio of the magnitude of the magnetic field BI along the axis of solenoid I to the magnitude of the magnetic field BII along the axis of solenoid II, BI/BII, is
a. 1/4. b. 1/2. c. 1. d. 2. e. 4.