Question

Problem 7.60 - MC A combination lock has a 1.4-cm-diameter knob that is part of the dial you turn to unlock the lock. To turn that knob, you twist your wrist as you grip it between your thumb and forefinger with a force of 4.0 N. Suppose the coefficient of static friction between the knob and your fingers is 0.60. Part A What is the most torque you can exert on the knob without having it slip between your fingers? Express your answer using four significant figures. $ \tau = 3.360 \times 10^{-2} \text{ N} \cdot \text{m} $ Part B If the maximum torque causes the knob to rotate at 15 RPM after 30 s of being constantly applied, what is the knob's moment of inertia? Assume the knob starts at rest. Express your answer using three significant figures and include the proper unit.

          Problem 7.60 - MC
A combination lock has a 1.4-cm-diameter knob that is part of the dial you turn to unlock the lock. To turn that knob, you twist your wrist as you grip it between your thumb and forefinger with a force of 4.0 N. Suppose the coefficient of static friction between the knob and your fingers is 0.60.
Part A
What is the most torque you can exert on the knob without having it slip between your fingers?
Express your answer using four significant figures.
$ \tau = 3.360 \times 10^{-2} \text{ N} \cdot \text{m} $
Part B
If the maximum torque causes the knob to rotate at 15 RPM after 30 s of being constantly applied, what is the knob's moment of inertia? Assume the knob starts at rest.
Express your answer using three significant figures and include the proper unit.

Problem 7.60 - MC
A combination lock has a 1.4-cm-diameter knob that is part of the dial you turn to unlock the lock. To turn that knob, you twist your wrist as you grip it between your thumb and forefinger with a force of 4.0 N. Suppose the coefficient of static friction between the knob and your fingers is 0.60.
Part A
What is the most torque you can exert on the knob without having it slip between your fingers?
Express your answer using four significant figures.
τ = 3.360 × 10^-2 N·m
Part B
If the maximum torque causes the knob to rotate at 15 RPM after 30 s of being constantly applied, what is the knob's moment of inertia? Assume the knob starts at rest.
Express your answer using three significant figures and include the proper unit.

Added by Jerry Y.

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