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P. 3946. An elevator cab, whose total mass with its passengers is 600 kg, ascends uniformly. The mass of the counterweight is 300 kg. The mechanical power of the motor is 10 kW and the efficiency is 80%.

a) Find the speed of the lift.

b) Calculate the tension in the rope which pulls the lift.

(4 points)

Deadline expired on 12 February 2007.

Statistics on problem P. 3946.
 192 students sent a solution. 4 points: 94 students. 3 points: 68 students. 2 points: 13 students. 1 point: 5 students. 0 point: 3 students. Unfair, not evaluated: 8 solutions. Unfair, not evaluated: 1 solution.

• Problems in Physics of KöMaL, January 2007

•  Támogatóink: Morgan Stanley