The electric motor in a street car develops a power output of80 hp at 1200 rpm as the vehicle moves up a hill at a speed of 30mph. Assume the gearing losses are negligible, calculate: (a) The torque developed by the motor. (b) The force opposing the motion of the bus. The electric motor in a street car develops a power output of80 hp at 1200 rpm as the vehicle moves up a hill at a speed of 30mph. Assume the gearing losses are negligible, calculate: (a) The torque developed by the motor. (b) The force opposing the motion of the bus.
Explanation / Answer
I will give you the formulae...rest you do yourself Formulae: Power(in Watts) = torque(in N-m) * angular velocity(inrps) Power(in Watts) = Force(in Newton) * linear velocity(inm/s) So convert Power = 80 hp into watt, angular velocity =1200RPMinto rps and linear velocity or speed = 30mph to metre/sec and thenapply the above formulae and solve