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A heat engine takes in 150 kJ of energy from a source at 740 K and expels 50 kJ to a reservoir at 300 K. Calculate the ideal efficiency and the actual efficiency of the engine.
an icy planet at some mass M and radius R is spinning at some velocity W the ice melts into space at the constant rate of K (masses/sec), at what rate is the velocity changing
A person drops a cylindrical steel bar (Y = 2.00 × 1011 Pa) from a height of 3.30 m (distance between the floor and the bottom of the vertically oriented bar). what is the maximum compression of the bar
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.93 x 104 m/s, and the radius of the orbit is 1.08 x 106 m. What is the orbital speed of the second satellite
A series RLC circuit has R = 50 %uF057, L = 2.7 %uF06DH, and C = 52 nF. find the rms amplitude of the current flowing through the circuit
A length of wire has a radius of 3.00 × 10 -3 m and a resistance of 0.200 ?. When the potential difference across the wire is 10.0 V, calculate the density of free electrons in the wire
You would like to slow down your aging process by traveling very fast relative to Earth on a spaceship. What is the required speed of the spaceship
A fisherman accidentally steps off the ledge of a 4.0 meter-high dock and falls into the lake below the dock. what is the fisherman's speed on entering the water
A car with a mass of 1.50x10^3 kg starts from rest and accelerates to a speed of 18.0 m/s in 12s. Assume that the force of resistance remains constant at 400-N all through this time. What is the average power developed by the car's engine?
a charge of -3.89c is fixed at the center of a compass. two additional charges are fixed on the circle of the compass
A rocket ship at rest in space gives a short blast of its engine, firing 90 kg of exhaust gas out the back end with an average velocity of 700 m/s.
A bungee jumper falls for 1.3s before the bungee cord beginsto stretch. How fast is the jumper going when the bungee cord beginsto stretch
Radio receivers can comfortably pick up a broadcasting station’s signal when the electric field strength of the signal is about 10.0 mV/m. If a radio station broadcasts in all directions with an average power of 42.0kW , what would be the maximum ..
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