A propeller is modeled as five identical uniform rods extending radially from its axis. The length and mass of each rod are 0.867 m0.867 m and 2.51 kg2.51 kg, respectively. When the propellor rotates at 529 rpm529 rpm (revolutions per minute), what is its rotational kinetic energy ?

In the figure, a wheel of radius 0.326 m is mounted on a frictionless horizontal axis. The rotational inertia of the wheel about the axis is 0.264 kg.m². A massless cord wrapped around the wheel's circumference is attached to a 4.00 kg box. The system is released from rest.When the box has a kinetic energy of 3.00 J, what are (a) the wheel's rotational kinetic energy and (b) the distance the box has fallen? Assume free-fall acceleration to be equal to 9.81 m/s². (a) Number (b) Number Hi Hi M m Units Units

A turntable (disk) of radius r= 25.0 cm and rotational inertia 0.395 kg · m rotates with an angular speed of 3.04 rad/s around a frictionless, vertical axle. A wad of clay of mass m = 0.254 kg drops onto and sticks to the edge of the turntable. What is the new angular speed of the turntable? rad/s

A typical helicopter with four blades rotates at 300 rpm and has a kinetic energy of 2.45  105 J. What is the total moment of inertia, in kg · m2 of the blades?