A hydrogen atom consists of a proton and an electron. If the orbital radius of the electron increases, the electric potential energy of the electron-proton system
A) increases.
B) decreases.
C) remains the same.
D) depends on the zero point of the potential.
A
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A vertical cylindrical cylinder, closed at the bottom end, contains 0.0100 moles of gas
It is fitted at the top with a piston, which can move freely. The mass of the piston is 14.0 kg and the initial height of the piston above the bottom of the cylinder is 25 cm. What is the temperature of the gas? A) 290 K B) 413 K C) 3620 K D) 405 K E) 500 K
A 2.00-kg mass oscillates on the end of a spring with spring constant 12.0 N/m. Its amplitude of oscillation decreases from 10.0 cm to 1.0 cm in 4.00 minutes. What is the linear damping coefficient of this oscillator?
A) 134 N?s/m B) 1.76 N?s/m C) 0.311 N?s/m D) 0.0384 N?s/m E) 0.622 N?s/m
Tides are influenced by
a. the moon b. the sun c. the uneven surface of the earth d. all of the above e. none of the above
An electric clothes dryer draws 20 A at 220 V. If the clothes put into the dryer have a mass of 7.0 kg when wet and 3.0 kg dry, how long does it take to dry the clothes? (Assume all heat energy goes into vaporizing water, Lv = 2.26 × 10^6 J/kg.)
a. 55 min c. 16 min b. 26 min d. 34 min