An object has a moment of inertia of l = 8 kg m^2. It initially rotates with an

Question

An object has a moment of inertia of l = 8 kg m^2. It initially rotates with an angular speed of 2 rad/s. What is the angular speed after 4 Nm of torque is applied by a breaking force for 2 seconds? Case show all steps and include units at all points of the following calculations. A 223 g hockey puck slides on ice cream from left or right at 1.73 m/s. Almost simultaneously, a 341 g mud-ball slides from right to left at 2.29 m/s. The two collide head on at the given speeds and merge into a single object. Assuming that everything sticks together and that the ice is completely frictionless, what is the speed and direction of the combined object? 1

Explanation / Answer

By Conservation of momentum

M1V1 + M2V2 =MV

223*1.73+ 341*2.29 =(223+341)*V

V=2.07 m/s

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