Why must the string held in the student's hand be pulled at a uniform rate?
For the mass on the plumb bob to pass directly above the masking tape marker on
each rotation its angular velocity must be constant and this can only happen if the
string is pulled at a uniform rate.
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Torque: Five forces act on a rod that is free to pivot at point P, as shown in the figure. Which of these forces is producing a counter-clockwise torque about point P? (There could be more than one correct choice.)
A. force A B. force B C. force C D. force D E. force E
A drive shaft resists torsional shear stress of 45 MPa and axial com-pressive stress of 100 MPa. The ratio of the magnitudes of the principal stresses (?1/?2) is approximately:
(A) 0.15
(B) 0.55
(C) 1.2
(D) 1.9
A uniform rod (length = 2.4 m) of negligible mass has a 1.0-kg point mass attached to one end and a 2.0-kg point mass attached to the other end. The rod is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through a point 1.0 m from the 2.0-kg mass. The rod is released from rest when it is horizontal. What is the angular velocity of the rod at the
instant the 2.0-kg mass passes through its low point? a. 1.7 rad/s b. 2.2 rad/s c. 2.0 rad/s d. 1.5 rad/s e. 3.1 rad/s