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Problem: A 20 kg sample of mercury is completely solidified and liberates 231.6 kJ of energy. What is the original temperature of the mercury? (The melting point of mercury is 234K, the heat of fusion of mercury is 11.3 kJ/kg, and the specific heat of mercury is 140 J/kg•K.). What is the mercury entropy change ΔS in this process?
A horizontal spring, resting on a frictionless tabletop, is stretched 12cm from its unscratched configuration and a 1.00-kg mass is attached to it. How does its final potential energy compare to its initial potential energy
A football quarterback is moving straight backward at a speed of 2.0 m/s when he throws a pass to a player 20.0 m straight downfield. How long does it take to get to the receiver
The pendulum is released, the two masses collide, and the collision is elastic. a) What is the velocity of m1 just before the collision?
A 50,000 kilogram locomotive, with steel wheels, is traveling at 9.0 m/s on steel rails when its engine and brakes both fail. Obtain how far will the locomotive roll before it comes to a stop
An 91 kg man climbs a 981 m high mountain in 1.01 hour and uses 7.6 kcal/min, Determine the power consumption in watts.
for a single isolated point charge carrying a charge of q 68.7 pc one equipotential surface consists of a sphere of
An electric blanket is connected to a 120-V outlet, What is the resistance of the heater wire in the blanket
A projectile of mass 0.702 kg is shot straight up with an initial speed of 16.1 m/s. How high would it go if there were no air resistance
A stream of water strikes a stationary turbine bladehorizontally, as the drawing illustrates. The incident water streamhas a velocity of +16.0 m/s, while the exiting water stream has avelocity of -16.0 m/s.
"For a system of two particles we often let the potential energy for the force among the particles approach zero as the separation of the particles approaches infinity. If this choice is made, describe why the potential energy at non-finite separatio..
A cube of unknown material which is 1 m on a side is observed to float in fresh water with 30% of the cube exposed above the water line. how much of the cube (in percent) is above the water line
A 0.50 kg physics book with dimensions of 25 cm 20 cm is on a table. What force does the book apply to the table
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