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An electric current of 1 A flows through a 20 ? resistor which is kept at a constant temperature of 10° C by flowing water. In 1 s what is the entropy change of the resistor and the entropy change of the water?
A prospector finds a solid rock composed of granite (? = 2650 kg/m3) and gold. The volume of the rock is 3.40 10-4 m3 and its mass is 3.87 kg. What percentage of the rock is gold by mass
A helicopter is ascending vertically with a speed of 5.57. At a height of 124 above the Earth, package is dropped from a window. How much time does it take for the package to reach the ground?
A small immersion heater can be used in a car to heat a cup of water for coffee or tea. What is its resistance
One cubic meter of water flowing over Niagara Falls in New York drops 98.1 meters. how much heat energy would the water have
A boy in a wheelchair (total mass 51.0 kg) has speed 1.40 m/s at the crest of a slope 2.40 m high and 12.4 m long.Find the work he did in pushing forward on his wheels
A 6.00 V lantern battery is connected to a 10.5 (ohm) lightbulb, What is the internal resistance of the battery
In a game of pool, a cue ball with an initial velocity of 1.50 m/s directed to the right (along the +x-axis) collides with the five ball, Find the cue ball's final velocity
Two boxes are connected by a cord running over a pulley, Calculate the acceleration of the system
a rifle with a mass of 2.5 kg fires a bullet with a mass of 0.0045kg. the bullet moves with a muzzle velocity of 350m/s after the rifle is fired
A 2.4 kg mass is placed on top of a vertical spring. the spring is compressed 4.2 cm. What is the energy stored in the spring
Two cars of mass 2000 kg and 1000 kg, respectively, collide inelastically. Their velocity after impact is 4 m/s, Find the initial speed and direction of the lighter car
In exercising, a weight lifter loses 0.123 kg of water through evaporation, the heat required to evaporate the water coming from the weight lifter's body. find the change in the internal energy of the weight lifter
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