Lesson_4.2_Homework

# Lesson_4.2_Homework - Lesson 16 Homework 1 A 2.5-kg...

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Lesson 16 Homework 1. A 2.5-kg cylinder of radius 11 cm is initially at rest. A rope of negligible mass is wrapped around it and pulled with a force of 17 N. Find (a) the torque exerted by the force, (b) the angular acceleration of the cylinder and (c) the angular velocity of the cylinder after 15 s. 2. A disk-shaped grindstone of mass 2.4 kg and radius 12 cm is spinning at 820 rpm. After the power is shut off, the grindstone comes to a stop in 12 s. (a) What is the angular acceleration of the grindstone? (b) What is the frictional torque responsible for stopping the grindstone? 3. An external torque of 50 Nm is applied to a wheel mounted on an axle that is not frictionless. If the wheel attains an angular velocity of 720 rpm in 24 s, what is the moment of inertia of the wheel? 4. Three masses 1 kg, 2 kg and 4 kg are connected by massless rods as shown in the figure. Find the moment of inertia of the system about an axis passing through the point A 2.5 m 4 kg 2 kg 1 kg 2.0 m 1.2 m A 5. Two point masses m

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## This note was uploaded on 05/01/2011 for the course PHY 2048 taught by Professor George during the Fall '10 term at Edison State College.

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Lesson_4.2_Homework - Lesson 16 Homework 1 A 2.5-kg...

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