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A long rope is suspended from the ceiling. Waves are started from the bottom traveling up the rope. It is observed that their speed changes as they move up the rope. Do they get faster or slower? Explain why this occurs.
A large boulder rests on a cliff 500 m above a small village in such a position that, if it should slide off, What is the final impact velocity of the boulder
Two charged bodies exert a force of 0.790N on each other. If they are moved so that they are one-fourth as far apart, what force is exerted.
A horizontal rod 0.200 m long carries a current through a uniform horizontal magnetic field of magnitude 0.067 T that points perpendicular to the rod. what is the current flowing through the rod
A mortar crew is positioned near the top of a steep hill. Enemy forces are charging up the hill and it is necessary for the crew to spring into action. find How long will the mortar shell remain in the air
A bullet is shot vertically up with v0 from ground level. The definition of vertical is by a plumb bob, find the location where the bullet returns to the ground
A circuit consists of a 0.15 microF capacitor, a 600 ohm resistor, and a 70 mH inductor in series. Calculate the rms current flow
A mirror produces an image that is located 38.00 cm behind the mirror when the object is located 7.60 cm in front of the mirror. What is the focal length of the mirror?
A hurricane wind blows across a 7.50m × 16.4m flat roof at a speed of 180km/hr, How much force is exerted on the roof
A student wants to find out the speed of a high-speed projectile, but doesn't have a high-speed measuring device. what is the speed of the projectile just before the collision
A disk of radius R = 9 cm is pulled along a friction less surface with a force of F = 15 N by a string wrapped around the edge. At the instant when d = 28 cm of string has unwound off the disk, what is torque exerted about the center of the disk.
A unit of area, often used in measuring land areas, is the "hectare", defined as 104m2. An open-pit coal mine consumes 66hectares of land, down to a depth of 23m, each year. What volume of earth, in cubic kilometers, is removed in this time.
A speeder is pulling directly away and increasing his distance from a police car that is moving at 25 m/s with respect to the ground. Find the speeder's speed with respect to the ground
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