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A ball with a mass of 25 grams is dropped from aledge 908 meters above the ground. What is its kinetic energy theinstant before it hits the ground? What is the potential energy of the ball before it is dropped? use the ground as the referencepoint for zero potential energy.
Dan is gliding on his skateboard at 4.0m/s . He suddenly jumps backward off the skateboard, How fast is Dan going as his feet hit the ground
A direction that causes the rod to rotate on the axle
The distance between the lenses in a compound microscope is 18 cm. The focal length of the objective is 1.5 cm. what must be the focal length of the eyepiece
A 10 kg block of ice slides along a frictionless surface that is inclined at a 60 degree angle with the horizontal. What is the weight of the block
A 27 pound meteorite struck a car, leaving a dent 21 cm deep in the trunk. If the meteorite struck the car with a speed of 500 m/s, what was the magnitude of its deceleration, assuming it to be constant.
A room measures 2.0 m by 5.5 m by 5.0 m. The heating and air-conditioning ducts to and from the room are circular with diameter 0.23 m, What is the necessary flow speed in the duct
Two charged bodies exert the force of .145N on each other. If they are moved so that they are one fourth as far apart, what force is exerted.
The distortion of Earth's crustal plates is an example of shear ona large scale. A particular crustal rock has a shear modulus of1.0 1010 Pa. What shear stress is involved when a 10.0km layer of this rock is sheared through a distance of 3.5-m?
A ball is tied to an elastic string of length 8.0m and swung in a horizontal circle with a velocity if 0.8m/s. When a metallic object is tied to a rope of length 2.75m and swung in a horizontal circle, it makes 1 revolution in 2.9s.
A puck slides on a surface for 5.6 m before it stops. If it was moving at a velocity of 15 m/s and has a mass of 1.2 kg, what is the force of friction exerted on the puck
A 55 g piece of aluminum at 21 °C is cooled to -196 °C by placing it in a large container of liquid nitrogen at that temperature. How much nitrogen is vaporized
Consider Iron asteroid (density 7900 kg/m^3) shaped like a cylinder 5.0 km long and 3.0 km in diameter, How much fuel is required to spin up the asteroid
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