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A heat engine is taking in 400 J from a hot reservoir that is at 20 degrees Celsius. It expels heat to a cold reservoir at 0 degrees Celsius> The engine does 300J of work. What is the actual efficiency of the engine? How much heat is expelled to the cold reservoir? What is the ideal efficiency of the engine? Is this engine possible?
A convex lens with a 10-cm focal length is in front of a concave lens with a 10-cm focal length. The lenses are separated by 40 cm. Where is the final image with respect to the convex lens
A narrow flat coil wound on a square frame has 120 turns and sides of 21.5 cm. What is the maximum torque that can be exerted by the field on the coil
An object is held up by two ropes. rope 1 makes an angle of 65 degrees above horizontal and the tension in it is T1 = 26N. rope 2 makes an angle of 32 degrees above horizontal and the object is in equilibrium. what is the tension in rope 2 (T2) an..
A baseball player hits a double and ends up on second base. A baseball "diamond" is a square, each side of length 27.4 m, with home plate and the three bases on the four corners. What is the magnitude of the player's displacement?
A stone is dropped into a river from a bridge 41.9 m above the water. What is the initial speed of the second stone
A positive charge of Q = 4.60 uC is fixed in place. From a distance of ri = 4.60 cm a particle of mass m = 5.70 g, What is the minumum distance rf between the two charges
A spy satellite is in circular orbit around Earth. It makes one revolution in 5.97 hours. How high above Earth's surface is the satellite
An air mass has a temperature of 68F at 970hPa with a mixing ratio of 5 g kg-1. Without any condensation or mixing the air mass now has a temperature of 50F and a pressure of 750hPa.
The combination of an applied force and a friction force produces a constant total torque of 35.0 N · m on a wheel rotating about a fixed axis. Find the magnitude of the torque due to friction
A 10-kg crate is placed in the bed of a truck at rest on horizontal ground. The truck accelerates uniformly at 1 m/s^2for 10 seconds. What is the sign of the work done on the crate
What is speed of the second train, which travels faster
A force F= (6x - 2y)N acts on a particle that undergoes a displacement delta r= (3x + y)m. find the work done by the force on the particle
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