The rotational inertia of a disk about its axis is 5.3kg.m^2. When a 7.1 kg weight is added to its rim, 9.4 m from the axis, the rotational inertia becomes:

The angular position of a point on a rotating wheel is given by 0 = 7.67+3.84t2 +3.65t3, where e is in radians and t is in seconds. At t= 0, what are (a) the point's angular position and (b) its angular velocity? (c) What is its angular velocity at t 8.10 s? (d) Calculate its angular acceleration at t = 2.83 s. (e) Is its angular acceleration constant? (a) Number Units (b) Number Units (c) Number i Units (d) Number i Units (e) Number

The angular position of a point on a rotating wheel is given by 0 = 2.31 +2.92t² +2.52t³, where is in radians and t is in seconds. At t= O, what are (a) the point's angular position and (b) its angular velocity? (c) What is its angular velocity at t = 4.72 s? (d) Calculate its angular acceleration at t = 1.56 s. (e) Is its angular acceleration constant? (a) Number i Units (b) Number i Units (c) Number i Units (d) Number i Units (e) Number

The angular position of a point on a rotating wheel is given by u = 2.0 + 4.0t2 + 2.0t3, where u is in radians and t is in seconds. At t  0, what are (a) the point’s angular position and (b) its angular velocity? (c) What is its angular velocity at t = 4.0 s? (d) Calculate its angular acceleration at t = 2.0 s. (e) Is its angular acceleration constant?

A machine part has the shape of a solid uniform sphere of mass 235 g and diameter 4.50 cm. It is spinning about a frictionless axle through its center, but at one point on its equator it is scraping against metal, resulting in a friction force of 0.0200 N at that point.

An object has a final angular velocity of 25 rad/s and sweeps through 80.0 rad with an angular acceleration of 2.5 rad/s2. What is its initial angular velocity?

A disk with a moment of inertia of 7.3 kg m^2 spins at 19 rad/s about its center axis.What is its rotational kinetic energy?

A playground merry-go-round has a radius of 3.5 m and a rotational inertia of 720 kgˑm2. It is initially spinning at 0.60 rad/s when a 25 kg child crawls from the center to the rim. When the child reaches the rim the angular velocity of the merry-go-round in rad/s is:

A dentist's drill starts from rest. After 3.10 s of constant angular acceleration it turns at a rate of 2.70 ✕ 104 rev/min. (a) Find the drill's angular acceleration. (b) Determine the angle (in radians) through which the drill rotates during this period.

A horizontal platform in the shape of a circular disk rotates on a frictionless bearing about a vertical axle through the center of the disk. The platform has a radius of 2.36 m and a rotational inertia of 218 kg-m2 about the axis of rotation. A 72.6 kg student walks slowly from the rim of the platform toward the center. If the angular speed of the system is 2.07 rad/s when the student starts at the rim, what is the angular speed when she is 0.433 m from the center? Number i Units