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You are now operating a Carnot engine at 40% efficiency, which exhausts heat into a heat sink at 298 K. If you want to increase the efficiency of the engine to 65%, to what temperature would you have to raise the heat reservoir?
a rowboat crosses a river with a velocity of 3.95 mih at an angle 62.5deg north of west relative to the water. the
A 3.00-µF and a 5.00-µF capacitor are connected inseries across a 30.0-V battery. A 10.00µF capacitor is then connected in parallel across the 3.00µF capacitor. Determine the voltage across the 10.00 µF capacitor.
A jet of water squirts out horizontally from a hole near the bottom of the tank. If the hole has a diameter of 3.40 mm, what is the height, h, of the water level in the tank.
Two weights are hung on either side of the pivot support of a meter stick. Ignore the weight of the meter stick and suppose it is pivoted in the middle. What is the size of the mass that should be hung on the left side of the stick to balance it.? ..
When cars are equipped with flexible bumpers, they will bounce off each other during low-speed collisions, thus causing less damage. What is the speed of the lighter car just after collision
lenzs law is said to be a consequence of the principle of conservation of energy. explain this statement by describing
a spacecraft drifts through space at a constant velocity of 5 kms. it then turns on a jet that provides a constant
A 65 diver stands at the end of a 27 springboard. What is the magnitude of the vertical force exerted by the hinge on the board
Two long parallel wires each carry 2.8A in the same direction, with their centers 1.5cm apart.Find the magnitude of the force of interaction (per length) between the wires.
Two shoppers walk from the door of mall to their car, that is 250m down a lane of cars and then turn 90 degrees to the right and walk an additional 60m what is the magnitude of the displacement of the shopper's car from mall door.
a 4.6 g bullet leaves the muzzle of a rifle with a speed of 320 ms. what force assumed constant is exerted on the
A bottle of saline solution (with a specific gravity of 1.02) is attached to a 1.2 m long piece of tubing with a 1.0 cm inner diameter. If the tubing is held vertically, filled with saline, and clamped at the bottom, (
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