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A heat engine takes in 1000 J of energy at 1000 K and exhausts 615 J at 200 K. What are the actual and maximum theoretical efficiencies of this heat engine?
A 110-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 370N. What is the final speed of the crate
The speed of an ion in a particle accelerator is doubled from 0.400c to 0.800c. Determine the final relativistic momentum of the ion
On a clear day the electric ?eld in the atmosphere near the earth's surface is 100 N/C, What is the potential at the top of a man's head if the man is 2 m tall and is standing
On a nice winter day at the South Pole, the temperature rises to ?63°F. What is the approximate temperature in degrees Celsius
As the police car approaches a brick wall it emits a sound at 800Hz. The speed of the car is 100km/h. Find the beat frequency recorded by the driver of the police car
A highway is to be built between tow towns, one of which lies 30.7 km south and 72.2 km west of the othe, What is the shortest lenght of highway that can be bult between the tow towns
Scientists plan to release a space probe that will enter the atmosphere of a gaseous planet. The temperature of the gaseous planet varies linearly with the height of the atmosphere.
In attempting to pass the puck to a teammate, a hockey player gives it an initial speed of 2.1 m/s. What minimum initial speed should the puck have been given so that it reached the teammate
the driver sees a child standing on the road. She takes .80 s to react, then steps on the brakes and slows at 6.5 m/s squared. Explain how far does the car go before it stops?
Three forces are applied to a solid cylinder of mass 12 kg (see the drawing). The magnitudes of the forces are F1 = 15 N, F2 = 24 N, and F3 = 16 N. Find the magnitude of the angular acceleration of the cylinder
A hockey stick is swung with the average angular acceleration of 1.5 rad/s2. What is the angular velocity of the stick as it strikes the ball at the end of 0.8 second swing.
Calculate the electric field intensity at a distance of 14 cm from the center of the shell
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