First Law of Thermodynamics: A sealed rigid tank contains 29 moles of an ideal gas, at an initial temperature of 270 K. The pressure of the gas is increased until the final pressure equals 1.90 times the initial pressure. The heat capacity at constant pressure of the gas is 24.0 J/mol ? K. How much heat is absorbed by the gas during this process? (R = 8.31 J/mol ? K)
A. 110 kJ
B. 170 kJ
C. 230 kJ
D. -52 kJ
E. 7.0 kJ
Answer: A
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AC Generator: An ac generator contains 80 flat rectangular loops of wire, each of which is 12 cm long and 8 cm wide. The loops rotate at 1200 rpm about an axis through the center and parallel to the long side. If the magnetic field in which the loop rotates is uniform, has magnitude 0.30 T, and is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?
A. 20 V B. 27 V C. 29 V D. 35 V
A strobe photograph shows equally-spaced images of a car moving along a straight road. If the time intervals between images is constant, which of the following cannot be positive?
a. the speed of the car b. the average velocity of the car c. the acceleration of the car d. the direction of motion of the car
The big bang is thought to have occurred about
A) 14 trillion years ago. B) 14 million years ago. C) 5000 years ago. D) a million years ago. E) 14 billion years ago.
A 1.10-kg wrench is acting on a nut trying to turn it. The length of the wrench lies directly to the east of the nut. A force 150.0 N acts on the wrench at a position 15.0 cm from the center of the nut in a direction 30.0° north of east
What is the magnitude of the torque about the center of the nut? A) 22.5 N?m B) 11.3 N?m C) 19.5 N?m D) 2250 N?m E) 1949 N?m