Part A IP Force to Hold a Baseball A person holds a 1.42-N baseball in his hand, a distance of 34.0 cm from the elbow joint, as shown in the figure(Figure 1). The biceps, attached at a distance of 2.75 cm from the elbow, exerts an upward force of 12.6 N on the forearm. Consider the forearm and hand to be a uniform rod with a mass of 1.30 kg. You may want to review (Page 335) Calculate the net torque acting on the forearm and hand. Use the elbow joint as the axis of rotation. T = - 2.47 N. m Submit Previous Answers Request Answer X Incorrect; Try Again; 7 attempts remaining • Part B If the net torque obtained in part A is nonzero, in which direction will the forearm and hand rotate? O counterclockwise O clockwise Figure 1 of 1 Submit Request Answer • Part C Humerus Biceps Would the torque exerted on the forearm by the biceps increase or decrease if the biceps were attached farther from the elbow joint? 126 N Radius O decrease O increase Ulna 2.75 cm -170 cm Mg 17.0 cm- Submit Request Answer
Angular Momentum
The momentum of an object is given by multiplying its mass and velocity. Momentum is a property of any object that moves with mass. The only difference between angular momentum and linear momentum is that angular momentum deals with moving or spinning objects. A moving particle's linear momentum can be thought of as a measure of its linear motion. The force is proportional to the rate of change of linear momentum. Angular momentum is always directly proportional to mass. In rotational motion, the concept of angular momentum is often used. Since it is a conserved quantity—the total angular momentum of a closed system remains constant—it is a significant quantity in physics. To understand the concept of angular momentum first we need to understand a rigid body and its movement, a position vector that is used to specify the position of particles in space. A rigid body possesses motion it may be linear or rotational. Rotational motion plays important role in angular momentum.
Moment of a Force
The idea of moments is an important concept in physics. It arises from the fact that distance often plays an important part in the interaction of, or in determining the impact of forces on bodies. Moments are often described by their order [first, second, or higher order] based on the power to which the distance has to be raised to understand the phenomenon. Of particular note are the second-order moment of mass (Moment of Inertia) and moments of force.
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