1.) [NOTE UNITS: 1 cm = 0.01 m, 1 g = 0.001 kg] An unsharpened pencil...
1.) [NOTE UNITS: 1 cm = 0.01 m, 1 g = 0.001 kg]
An unsharpened pencil has a length 11 cm and a mass 40 g. It is
standing vertically on a table, resting on its eraser. It then
begins to fall. Because the eraser does not slide on the table, the
pencil rotates about its eraser.
(a) The rotational inertia I of the pencil is ___ kg.
(b) At a particular time it experiences a torque 0.011 Nm. At this
time, the magnitude of its rotational acceleration is _____
rad/s2
2.) [NOTE UNITS: 1 g = 0.001 kg]
A solid rod, with a radius 0.08 m and a mass 320 g, rotates about
its axis. Over a time interval of 30 s, its rotational velocity
increases from 10 rad/s2 to 40 rad/s2. The
magnitude of the average torque applied to the rod during that time
is ____ Nm.
Homework Answers
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1.) [NOTE UNITS: 1 cm = 0.01 m, 1 g = 0.001 kg]
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