A student sits on a rotating stool holding two 5 kg objects. When his arms are extended
horizontally, the objects are 1 m from the axis
of rotation, and he rotates with angular speed
of 0.7 rad see. The moment of inertia of the
student plus the stool is 8 kg mº and is as-
sumed to be constant. The student then pulls
the objects horizontally to a radius 0.39 m
from the rotation axis.

All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.