Q: In a constant-volume process, dU = nCV dT.
In a constant-volume process, dU = nCV dT. But in a constant-pressure process, it is not true that dU = nCp dT. Why not?
See AnswerQ: When a gas surrounded by air is compressed adiabatically, its temperature
When a gas surrounded by air is compressed adiabatically, its temperature rises even though there is no heat input to the gas. Where does the energy come from to raise the temperature?
See AnswerQ: When a gas expands adiabatically, it does work on its surroundings
When a gas expands adiabatically, it does work on its surroundings. But if there is no heat input to the gas, where does the energy come from to do the work?
See AnswerQ: A 90.0kg mail bag hangs by a vertical
A 90.0kg mail bag hangs by a vertical rope 3.5 m long. A postal worker then displaces the bag to a position 2.0 m sideways from its original position, always keeping the rope taut. (a) What horizonta...
See AnswerQ: Tarzan, in one tree, sights Jane in another tree.
Tarzan, in one tree, sights Jane in another tree. He grabs the end of a vine with length 20 m that makes an angle of 45° with the vertical, steps off his tree limb, and swings down and then up to Jane...
See AnswerQ: A turntable rotates with a constant 2.25 rad/s2
A turntable rotates with a constant 2.25 rad/s2 angular acceleration. After 4.00 s it has rotated through an angle of 30.0 rad. What was the angular velocity of the wheel at the beginning of the 4.00-...
See AnswerQ: A circular saw blade 0.200 m in diameter starts from
A circular saw blade 0.200 m in diameter starts from rest. In 6.00 s it accelerates with constant angular acceleration to an angular velocity of 140 rad/s. Find the angular acceleration and the angle...
See AnswerQ: A high-speed flywheel in a motor is spinning at 500
A high-speed flywheel in a motor is spinning at 500 rpm when a power failure suddenly occurs. The flywheel has mass 40.0 kg and diameter 75.0 cm. The power is off for 30.0 s, and during this time the...
See AnswerQ: At t = 0 a grinding wheel has an angular velocity of
At t = 0 a grinding wheel has an angular velocity of 24.0 rad/s. It has a constant angular acceleration of 30.0 rad/s2 until a circuit breaker trips at t = 2.00 s. From then on, it turns through 432 r...
See AnswerQ: A safety device brings the blade of a power mower from an
A safety device brings the blade of a power mower from an initial angular speed of
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