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A water heater consisting of a metal coil that is connected across the terminals of a 18-V power supply is able to heat 245 mL of water from room temperature (20°C) to boiling point in 75 s. What is the resistance of the coil?
a long string carries a wave a 5.20-m segment of the string contains four complete wavelengths and has a mass of 180 g.
Recall from thermodynamics that if an object of mass m absorbs an amount of energy Q, its temperature will increase according to Q=mc(Tfinal-Tinitial), where c is th specific heat of the material.
A 7.5-m long extension cord carries a current of 12 amps. The cord is made of two wires, Find the force between those two wires
A 48 kg skier starts from rest at a height of H = 27 m above the end of the ski-jump ramp. As the skier leaves the ramp, his velocity makes an angle of 28° with the horizontal. avoid the effects of air resistance and assume the ramp is frictionles..
A diver can change his rotational inertia by drawing his arms and legs close to his body in the tuck position, what was his angular velocity when he left the diving board
A slingshot fires a pebble that is in the air for 5.30seconds. It lands 73.0m away from where it was initially shot. Determine the initial horizontal and vertical components of the velocity
A study shows that mammalian red blood cells (RBCs) carry electric charge resulting from 4.4 million (rabbit cells) to 15 million (human cells) excess electrons spread over their surfaces
A cannonball is shot (from ground level) with an initial horizontal velocity of 37.0 m/s, What is the speed of the cannonball 3.5 seconds after it was shot
In theclassical model of conduction, the electron loses energy on averagein a collision because it loses the drift velocity it had picked upsince the last collision. Where does this energy appear
What is the electric potential energy of a system that consists of two protons 2.1×10?15 m apart-as might occur inside a typical nucleus
90 grams of water at 80°C are mixed with an equal amount of water at 20°C in a completely insulated container. The final temperature of the water is 50°C. How much heat is lost by the hot water
Compressed air is used to fire a 60 ball vertically upward from a 1.1--tall tube. The air exerts an upward force of 2.2 on the ball as long as it is in the tube. How high does the ball go above the top of the tube? Express your answer to two signific..
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