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A heat engine does 158,000 J of work and gives out 189,000 J of heat to the cold temperature reservoir. The hot and cold temperatures the engine operates at are 382oC and -20oC.
What is the ideal (Carnot) efficiency?
What is the actual efficiency?
A wave on a string is described by the relation y =A sin(36t - 0.042x), where t is measured in seconds and x in meters, with A = 0.16 m. Estimate what is the speed of the wave
A swimmer swims across the river and reaches the opposite shore directly across from where he started. How long does it take the swimmer to reach the opposite shore
A 4.00 meter long rod is hinged at one end. The rod is initially held in the horizontal position, and then released as the free end is allowed to fall. Determine the angular acceleration as it is released
A girl consumes 8.4 x 106 (2000 food calories) of energy per day whole maintaining a constant weight. Compute the average power she produces in a day
q1. a 60 m ladder leans against a wall. what is the minimum force of friction essential to prevent the ladder from
An object is sliding on a horizontal surface. The coefficient of kinetic friction between the object and the surface is 0.250. how far will the object travel before it stops
If the pressure of the 1.2-cm3 volume is reduced to 3.0 × 10?11 Pa (an extremely good vacuum) while the temperature remains constant, how many moles of gas remain in the container
A series ac circuit contains a 270-\;{\rm{ }}\Omega resistor, a 10.0-\;{\rm mH} inductor, What is the average power delivered to the resistor, to the capacitor, and to the inductor
converging lens has a focal length of 86.50 cm. A 14.0 cm tall object is located 135.0 cm in front of this lens. What is the image distance? Is the image real or virtual?
a platinum sphere with radius 0.0109 m is totally immersed in mercury. find the weight of the sphere the bouyant force
Two wires are parallel (heading north-south). The current in each wire is northward. What is the direction of the magnetic field at the location of the right-hand wire due to the current in the left-hand wire? What is the direction of the magnetic fo..
In a supernova, a red giant of mass 1.19*1031 kg collapses into a neutron star of mass 5.97*1030 kg
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