1. If the length of a rob is doubled, its moment of inertia about the center of
ID: 1910120 • Letter: 1
Question
1. If the length of a rob is doubled, its moment of inertia about the center of mass: a) also double, b) increases by a factor of 4 c) decreases by a factor of 2 d) remains the same 2. Which one of the following statement is true; a) the work done by a conservative force in any closed path is always zero b) the work done by a conservative force is always positive. c) the work done by a conservative force is dependent on the path d) the work done by conservative force cannot be zero. 3. If there are forces of friction acting on a mass. a) the total mechanical energy of the mass is constant b) the dissipated energy is equal to the change in kinetic energy c) the kinetic energy is constant but the potential energy is not constant d) none of the above is true. 4) If the moment of inertia of a disk with rotation through its center is I, and the moment of inertia with rotation axis through it edge is J, a) I > J b) I = J c) I < J d) none of the above is true.Explanation / Answer
the answer is: 1) moment of inertia about the center of mass = (1/12)*m*L^2 .we know that L = 2L so, moment of inertia about the center of mass =4* (1/12)*m*(L^2) b) increases by a factor of 4 .hope it is right
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