First Law of Thermodynamics: An expandable container holds 2.30 mole of helium, He, gas with an initial pressure of 770 kPa and an initial volume of 2.10 L. The gas expands isothermally to a final pressure of 350 kPa. How much heat is gained by the gas during this process? (R = 8.31 J/mol ? K)
A. 1280 J
B. 792 J
C. 685 J
D. 1370 J
E. 1700 J
Answer: A
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Consider the current-carrying loop shown below. The magnetic field is vertical, but we are holding the loop so it is tilted at an angle ? with respect to the horizontal, with its back leg (leg 3) higher than its front leg (leg 1). If we release the loop, which way will it turn around its axle?
A. Clockwise
B. Counterclockwise
C. The loop is not affected by the magnetic field.
During a total solar eclipse, which occurs?
A. the Moon passes just outside the Earth’s umbra B. the Moon’s umbra touches the Earth C. the Moon’s umbra just misses the Earth D. the Moon moves through the Earth’s umbra
Jennifer hits a stationary 0.20-kg ball, and it leaves her racket at 40 m/s. Time-lapse photography shows that the ball was in contact with the racket for 40 ms
(a) What average force did the ball exert on the racket? (b) What is the ratio of this force to the gravitational force that Earth exerts on the ball?
A particle (charge = 5.0 ?C) is released from rest at a point x = 10 cm. If a 5.0-?C charge is held fixed at the origin, what is the kinetic energy of the particle after it has moved 90 cm?
a. 1.6 J b. 2.0 J c. 2.4 J d. 1.2 J e. 1.8 J