Question 1 of'll > -/1 E View Policies Current Attempt in Progress The drawing illustrates an overhead View of a door and its axis of rotation. The axis is perpendicular to the screen. There are four forces acting on the door, and they have the same magnitude. Rank the torque Tthat each force produces, largest to smallest. Axis of Rotation D00: _ (Overhead View) 1:4 0 T4, T3, T2, T1 0 T3, T2, T1 and T4 (a two-way tie) 0 T1, T4, T3, 1'2 0 T2, T3 and T4 (a twoway tie), T1 0 T2, T4, T3. 11 Question 2 of 11 - /1 IE ... View Policies Current Attempt in Progress The drawing shows three objects rotating about a vertical axis. The mass of each object is given in terms of mo, and its perpendicular distance from the axis is specified in terms of ro. Rank the three objects according to their moments of inertia, largest to smallest. Axis of rotation A 10mg B 2mo 370 O B, A, C O A, B, C O A, C, B O C, A, B O B, C, AQuestion 3 of 11 - /1 WIN - . . . View Policies Current Attempt in Progress The drawing shows a uniform horizontal beam attached to a vertical wall by a frictionless hinge and supported from below at an angle 0 = 440 by a brace that is attached to a pin. The beam has a weight of 350 N. Three additional forces keep the beam in equilibrium. The brace applies a force P to the right end of the beam that is directed upward at the angle 0 with respect to the horizontal. The hinge applies a force to the left end of the beam that has a horizontal component H and a vertical component V . Find the magnitudes of these three forces. Hinge Beam Pin Brace (a) V= (b) P = (c) H = iQuestion 4 of 11 - /1 . . . Next question View Policies Current Attempt in Progress A man holds a 154-N ball in his hand, with the forearm horizontal (see the figure). He can support the ball in this position because of the flexor muscle force M, which is applied perpendicular to the forearm. The forearm weighs 23.0 N and has a center of gravity as indicated. Find (a) the magnitude of M and the (b) magnitude and (c) direction (as a positive angle counterclockwise from horizontal) of the force applied by the upper arm bone to the forearm at the elbow joint. Upper arm bone L Flexor muscle M Elbow cg joint 0.0510 m+ 0.0890 m 0.330 m- (a) Number i UnitsQuestion 5 of 11 > - /1 E . . . View Policies Current Attempt in Progress Multiple-Concept Example 10 reviews the approach and some of the concepts that are pertinent to this problem. The figure shows a model for the motion of the human forearm in throwing a dart. Because of the force M applied by the triceps muscle, the forearm can rotate about an axis at the elbow joint. Assume that the forearm has the dimensions shown in the figure and a moment of inertia of 0.059 kg.m2 (including the effect of the dart) relative to the axis at the elbow. Assume also that the force M acts perpendicular to the forearm. Ignoring the effect of gravity and any frictional forces, determine the magnitude of the force M needed to give the dart a tangential speed of 6.3 m/s in 0.11 s, starting from rest. 0.28 m Axis at elbow joint 0.025 mQuestion 6 of '11 /1 E View Policies Current Attempt in Progress The drawing shows the top View of two doors. The doors are uniform and identical. Door A rotates about an axis through its left edge, and door B rotates about an axis through its center. The same force is applied perpendicular to each door at its right edge, and the force remains perpendicular as the door turns. No other force affects the rotation of either door. Starting from rest, door A rotates through a certain angle in 3.85 5. How long does it take door B (also starting from rest) to rotate through the same angle? If Door A I_: Axis Door B Axis 0 Number Units V Question 7 of 11 - /1 View Policies Current Attempt in Progress A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk at its center. Rotating flywheels provide a means for storing energy in the form of rotational kinetic energy and are being considered as a possible alternative to batteries in electric cars. The gasoline burned in a 424-mile trip in a typical midsize car produces about 3.87 x 10" J of energy. How fast would a 40.0-kg flywheel with a radius of 0.518 m have to rotate to store this much energy? Give your answer in rev/min. Number UnitsQuestion 8 of 11 / 1 E View Policies Current Attempt in Progress A bowling ball encounters a 0.760-m vertical rise on the way back to the ball rack, as the drawing illustrates. Ignore frictional losses and assume that the mass of the ball is distributed uniformly. The translational speed of the ball is 9.68 m/s at the bottom of the rise. Find the translational speed at the top. Number n Units V Question 9 of 11 - /1 E View Policies Current Attempt in Progress A rotating door is made from four rectangular glass panes, as shown in the gure. The mass of each pane is 79.4 kg. A person pushes on the outer edge of one pane with a force of F = 131 N that is directed perpendicular to the pane. Determine the magnitude of the door's angular acceleration. Number l Units v I \\ A II no Question 10 of11 View Policies Current Attempt in Progress A block (mass = 2.5 kg) is hanging from a massless cord that is wrapped around a pulley (moment of inertia = 1.3 x 10'3 kg-mz), as the gure shows. Initially the pulley is prevented from rotating and the block is stationary. Then, the pulley is allowed to rotate as the block falls. The cord does not slip relative to the pulley as the block falls. Assume that the radius of the cord around the pulley remains constant at a value of 0.037 m during the block's descent. Find (a) the angular acceleration of the pulley and (b) the tension in the cord. (a) Number l Units v (b) Number n Units v Question 11 0111