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a 10,000kg railroad car is traveling with an initial speed of 24.0 m/s when it strikes an identical railroad car that is initially at rest. as a result of the collision the cars coupled together. what is initial speed of the coupled cars and how much original kinetic energy was lost in this collision? what are some sources of lost of energy of motion.
A 4-kg block lies on a horizontal table whose coefficient of friction is 0.3. A horizontal rope is redirected by a uniform solid disk (pulley) of mass 2 kg to a mass of 12-kg hanging off the table. What is the angular acceleration of the disk
A golf course sprinkler system discharges water from a horizontal pipe at the rate of 7375 cm3/s. What is the water's absolute pressure
A 2100 kg car traveling to the right at 32m/s is chasing a second car of the same mass that is traveling to the right at 10m/s.
A ship, carrying fresh water to a desert island in the Caribbean, has a horizontal cross-sectional area of 2790m2 at the waterline. How much water was delivered
Two long parallel wires seperated by 50cm both carry currents of 4.0 A in the same vertically up direction. Find the magnetic field midway between the wires
The output voltage of an AC generator is given by ?v = (160 V) sin (50?t). The generator is connected across a 19.0-? resistor, By inspection, what is the maximum voltage
A hill that has a 41.8% grade is one that rises 41.8 m vertically for every 100.0 m of distance in the horizontal direction. At what angle is such a hill inclined above the horizontal
If the ball is in contact with the wall for 0.200 s, what is the average force exerted by the wall on the ball? (Suppose right is the positive direction.)
A radio antenna broadcasts a 1.0 MHz radio wave with 28 kW of power. What is the electric field amplitude at this distance
the temperature of the air in a resonator is 15degc when a tuning fork vibrates at one end the spacing between tow
A cue ball (mass = 0.145 kg) is at rest on a frictionless pool table. The ball is hit dead center by a pool stick, which applies an impulse of +1.15 N · s to the ball. Find the velocity of the second ball just after it is struck
A rock of mass 49 kg accidentally breaks loose from the edge of a cliff and falls straight down. What is the magnitude of the acceleration of the rock
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