A small motorised vehicle, a child’s ‘ride-on’ car, is poweredby a unit connected to its two front wheels. The unit contains ad.c. electric motor. a. Suggest to possible mechanical alternative for driving thevehicle and state five(5) reasons why a d.c electric motor is agood choice for this application. b. When the car is lifted off the ground, its front wheels spinfreely at 132 rpm. The motor itself is rated as having a no-loadspeed of 450 rad s^-1. Ignoring efficiency losses, what approximategear ratio (to the nearest whole number) has been used in the motorunit? c. Once the car and its small passenger load are in steadymotion along a horizontal pavement, the wheels rotate at 60% oftheir ‘no-load’ speed.If the stall torque of the geared motor unitis 9 N m, what torque is generated by the unit in maintaining thislower steady speed? d. When one of the child’s parents climb in as well, the totalforce against which the motor has to work increases 5-fold. Explainwhat happens and why. . . .
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