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A hoisting engine lifts a 200kg bucket of 1200liters of clay with density of 2000kg per cubic meter to a height of 7 meters in 20seconds. the power input is 12kw. what is the work output?what is the power output in kw? what is the efficiency of the machine?
A solid cylinder carries a current that is uniform over its cross section. Where is the magnitude of the magnetic field the greatest ?
High-speed stroboscopic photographs show that the head of a200-g golf club is traveling at 55m/s just before it strikes a 46-ggolf ball at rest on a tree. What is the speed of the golf ball just after impact
Consider a regular hexagon of side length, L=10cm. A charge, Q=2uc, is located at each vertex(there are 6). find the electostatic potential at the center of the hexagon
A positively charged oil drop of mass 2.4 10-15 kg is placed in the region of a uniform electric field between two oppositely charged, What is the magnitude of the charge on the drop
Two point charges q = +10C are a distance 0:12 m apart. Calculate the electrostatic force on each charge
The following takes place with inelastic collision. Ball 1 travels up with a mass of 3 Kg and a velocity of 20 m/s. How high do the balls travel after the collision
About 27% of the body of a person floating in the Dead Sea will be above the water line. find the density of the water in the Dead Sea
A space station, in the form of a wheel 184 m in diameter, rotates to provide an "artificial gravity" of 7.40 m/s2 for persons who walk around on the outer rim. Find the rotational frequency of wheel (in revolutions per minute) that will produce t..
A string is rolling several rolls about a solid sphere, and then the sphere leaved to fall from the end of the string. What is the acceleration of the center of the sphere
A railroad car of mass 3.0 104 kg moving at 4.00 m/s collides and couples with two coupled railroad cars, What is the speed of the three coupled cars after the collision
Water is being pumped through a horizontal pipe that is 28.8 m long and 17.0 cm in diameter. what gauge pressure must the pump provide to give the same volume flow rate as for the first pipe
A very tall flagpole, temporarily charged uniformly by lightning, What is the linear density of the charge on the flagpole
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