M?Intoox r786) ×Ati @ https://saka × Sakal@URI × . D Microsoft Vi × Grevinin toi

Question

M?Intoox r786) ×Ati @ https://saka × Sakal@URI × . D Microsoft Vi × Grevinin toi × www webassign net/web/Student/Assignment-Responses/submitdepa 18489761 ?Ruvoktion: Masters 201 × × 1203 H. × C 0 A firm wants to determine the amount of frictional torque in their current line of grindstones, so they can redesign them to be more energy efficient. To do this, they ask you to test the best- selling model, which is basically a diakshaped grindstone of mass 1.4 kg and radius 7,70 cm which operates at 750 rev/min. When the power is shut off, you time the grindstone and find it tak 34.3 s for it to stop rotating (a) What is the anguiar acceleration of the grindstone? (Assume constant angular acceleration.) rad/s b) What is the frictional torque exerted on the grindstone? N m

Explanation / Answer

? = ??/?t

= -750rev/min * 2? rad/rev * 1min/60s / 34.3s

= -2.289 rad/s²

? = I?

= ½ * 1.4kg * (0.077m)² * 2.289rad/s²

= 0.00950 N·m

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