A800-gram grinding wheel 27.0 cm in diameter is in the shape of a uniform solid disk. (we can ignore the small hole at the center.) when it is in use, it turns at a constant 245 rpm about an axle perpendicular to its face through its center. when the power switch is turned off, you observe that the wheel stops in 50.0 s with constant angular acceleration due to friction at the axle?

Explanation:

d = Diameter of wheel = 27 cm

r = Radius =

m = Mass of wheel = 800 g

= Initial angular velocity =

Equation of rotational motion

Moment of inertia is given by

Torque is given by

The torque the friction exerts is -0.0037406448 Nm

For more information on torque and moment of inertia refer

d) physical means can be used to separate the components of air.

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.