A-LevelPhysicsForces, density and pressure9702/12 · Oct/Nov 2009 · Q121 Mark
The diagram shows two pulley wheels connected by a belt. [Figure 12.1] Wheel Q is driven by a motor and rotates clockwise at a constant rate. Wheel Q puts tension in the top portion of the belt, which in turn drives the wheel P. The lower portion of the belt is slack and has no tension. The weight of the belt and frictional forces are negligible. The diameter of P is 150 mm. The diameter of Q is 100 mm. The torque applied to Q is 3.0 Nm. What is the tension in the belt and the torque on wheel P?
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Atension in top of belt /N: 20, torque on wheel P /Nm: 2.0
Btension in top of belt /N: 30, torque on wheel P /Nm: 4.5
Ctension in top of belt /N: 40, torque on wheel P /Nm: 2.0
Dtension in top of belt /N: 60, torque on wheel P /Nm: 4.5
✓ Correct answer
D: tension in top of belt /N: 60, torque on wheel P /Nm: 4.5
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