Question

Number: structions: Read carefully each question and enclose your answer Figure (a) is an overhead view of a horizontal bar that can pivot; two horizontal forces act on he bar, but it is stationary. (Spoints) Piot polnt If the angle between the bar and F is changed as is shown in (b) and the bar is still not to turn, should F2 be made larger, made smaller, or left the same? Smaller Larger Same 2) The figure shows three disks, each with a uniform distribution of mass. The radii R and masses M are indicated. Each disk can rotate around its central axis (perpendicular to the disk face and through the center). Rank the disks according to their rotational inertias calculated about their central axes, greatest first. (Spoints) M: zo kg 7kg kg c, b, a b, a, c b, c, a b, a, c b, c, a

Answer 1

1) The torque must be maintained, so if sin theta is to decrease, F has to increase. Thereofore, F₂ should be made greater.

2) The formula for inertia is 0.5*m*r² .Just put all the given values, we get b > c >a