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A ski trail makes a vertical descent of 78.0 m (as shown in the figure below ). A novice skier, unable to control his speed, skis down this trail and is lucky enough not to hit any trees. If the skier is moving at 10.3 m/s at the bottom of the trail, calculate the total work done by friction and air resistance during the run. The skier's mass is 73.6 kg.
A spring with a spring constant of 42.0 N/cm has a block attached to one end and the other end is fixed. How much additional work is done by the spring if it is stretched by an additional 15.2 mm
needing help the secretary of the united states department of agriculture asked your teacher if a chicken-and-a-half
A 671-kg cannon fires a 18.5-kg projectile with a speed of 273 m/s with respect to the muzzle. what is the speed of the projectile with respect to the ground
extension cords are often made from 1.0 mm diameter copper wire. a what is the resistance per unit length of this wire?
A very fast-moving train car passes you, moving to the right at 0.50c. You measure its length to be 12m. How long does David measure the train car to be
A 2180kg satellite used in a cellular telephone network is in a circular orbit at a height of 750km above the surface of the earth. What is the gravitational force on the satellit
There is a charge of -3e locked down at a point on a table. 15 meters away, a charge of 3e is released from a scientists hand. What is the potential energy of the charge just as it is released from the scientists hand
A dog sitting 3.7m from a vertical mirror thinks its image is another dog. How far is the image from the dog
A child holds a candy bar 10.0 cm in front of a convex mirror andnotices that the image is only one-half the size of the candy bar. What is the radius of curvature of the mirror?
A scuba diver and her gear displace a volume of 65 L and have a total mass of 68 kg. Will the diver sink or float
In a museum exhibit, three equal weights are hung with identical wires. Each wire can support a tension of no more than 72.0N without breaking. Under these conditions, what is the tension in the middle wire
Each second, 1150 m3 of water passes over a waterfall 95 m high. At what rate does the generator produce electrical energy
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