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Calculate the minimum amout of work (in joules) required to freeze one liter of water originally at temperature T = 20 degrees celsius. Assume the heat reservoir to be at 20 degrees celsius. The heat of fusion of water is 80 cal/g.
The Moon's mass is 7.36x10^22 kg and its assumed circular orbit has radius 3.84x10^8 and a period of 27.3 days. Find the moons kinetic energy.
Calculate the x-component of vector. A uniform electric field of magnitude 375 N/C pointing in the positive x-direction acts on an electron, which is initially at rest.
The distance to the Andromeda Galaxy is estimated at about 2 x 10(6) light years. A light year is distance traveled by light in one year; if the speed of light is 3 x 10(8) m/s, about how far is it from our galaxy to Andromeda? (1 year =3.15 x 10(..
If the patch is 78 meters wide and the average force of air resistance on the skier is 179 newtons, explain how fast is she going after crossing the patch?
Dan is gliding on his skateboard at 4.00m/s . He suddenly jumps backward off the skateboard, How fast is Dan going as his feet hit the ground
A baseball (m = 149 g) approaches a bat horizontally at a speed of 42.8 m/s (96 mi/h) and is hit straight back at a speed of 48.4 m/s (108 mi/h). what is the average force exerted on the ball by the bat
What is the speed of light in crown glass (n = 1.52) and What is the speed of light in ethyl alcohol (n = 1.36)
A crate of 31.9- tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it and observe that the crate just begins to move while your force exceeds 345. After that you must reduce your push to 247 to keep it moving at a..
A nuclear power plant has an electrical power output of 1700 MW and operates with an efficiency of 34%. what is the rise in temperature of the flowing water
A 10.1-g bullet is fired into a stationary block of wood having mass m = 5.04 kg. The bullet imbeds into the block. What was the original speed of the bullet
The cheetah can reach a top speed of 114 km/h (71 mi/h). While chasing its prey in a short sprint, find the cheetah's average acceleration during the short sprint
An airplanes airspeed (relative to still air) is 135 mph. The wind speed relative to the ground is 37 mph and is directed at theta = 51 deg
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