Torque, Power and Electricity - MLWGS ACE

A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?

• 7.5 Nm
• 1.5 Nm
• 750 Nm
• 150 Nm

The easiest way to open a heavy door  is by applying the force

• Near the hinges
• In the middle of the door
• At the edge of the door far from the hinges
• At the top of the door

What is the SI Unit for Torque

• Nm
• N
• W
• J

If the torque required to loosen a nut on the wheel of a car has a magnitude of 60.0 N• m, what minimum perpendicular force must be exerted by a mechanic at the end of a 45.0 cm wrench to loosen the nut?

• .666 Nm
•  133.3 N
• 66.7 N
• 13.3 Nm

Which of these are measurements of power?

• 100 joules
• 100 watts
• 100 joules/second

• 100 hertz

Which of the following is an equation for calculating power?

• distance / time
• work x time
• work / time
• force x distance

How is horsepower related to torque?

• Horsepower measures the speed of the motor only.
• Horsepower is the amount of torque needed to stop a moving car

• Horsepower is the rate of torque application.
• Horsepower is the amount of torque needed to accelerate a car

If a driven gear has 40 teeth and the driver gear has 10 teeth, what is the gear ratio?

• 1:2
• 2:1
• 4:1
• 1:4

Which arrangement will increase torque?

• small driver gear and equal size driven gear

• large driver gear and smaller driven gear

• small driver gear and larger driven gear

• large driver gear and equal size driven gear

RPM stands for?

• revolutions per minute

• revolutions per mile

• rotations per mile

• rapid piston manufacturer