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A 62.1 kilogram skier coasts up a snow-covered hill that creates an angle of 23.1 degree with the horizontal. The initial speed of the skier is 8.90 m/s. After coasting a distance of 2.07 meter up the slope, the speed of the skier is 3.35 m/s. Find the work done by the kinetic frictional force that acts on the skier.
If the x position of a particle is measured with an uncertainty of 1.00×10-10 m, then what is the uncertainty of the momentum in this direction
Suppose you see two main-sequence stars of the same spectral type. Star 1 is dimmer in apparent brightness than Star 2 by a factor of 100. What can you conclude? (Overlook any effects that might be caused by interstellar dust and gas.)
A baseball player hits a ball at 49.2m/s at an angle of 29.0 degrees above the horizontal. The outfield bleachers are 145 m away from the home plate.
An aluminum ring needs to be placed over a cylinder steel bar. At 10.00 degrees C, Find the temperature of the ring at which it fits over the bar
A nuclear power plant generates 2000 MW of heat energy from nuclear reactions in the reactor's core. determine the possible thermal efficiency of the power plant
The hot reservoir of a heat engine is steam at 100?C while the cold reservoir is ice at 0?C. In 1.2hrof operation, 11kg of steam condenses, What is the power output of the heat engine
A laser (wavelength 600nm) passes through a 2.44mm circularapertue and hits a screen 1km away. What is the diameter of the spot on the screen
a ray of light is incident on the mid-point of a glass prismsurface at an angle of 25 degrees with the normal. for
A Carnot engine performs work at the rate of 480 kW as using 640 kcal of heat per second. If the temperature of the heat source is 540°C, at what temperature is the waste heat exhausted.
What is the final velocity of a hoop that rolls without slipping down a 3.00 m high hill, starting from rest
a gun has a spring constant of 10N/cm. when the gun is inclined upward by 30 degree to the horizontal a 10 g ball is shot to the height of 2 m above the muzzle of the gun
A 3.18-nF parallel-plate capacitor is charged to an initial potential difference ?Vi = 100 V and is then isolated. How much work is required to withdraw the porcelain sheet
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