Question

A spinning top is an old child's toy that spins on a pointed end. A top is spinning at 4 rev/s and comes to a stop in 64 seconds. Assume the top slows down with constant angular acceleration. An insect is unfortunate enough to be sitting on the edge of the 3 cm radius spinning top.

a. What is the tangential acceleration of the insect?

b. How many revolutions does it make before coming to a stop?

c. How many meters has the insect traveled during these revolutions?

Answer #1

THANKS! PLEASE RATE IT UP

1. A disk of mass M=160kg and radius R=0.40m spins with an
initial rate of 12 revolutions per second. Because of friction in
the bearing, the disk slows down at a uniform rate. After 20
minutes it comes to a stop.
(a) How many revolutions does the disk make before coming to
rest?
(b) What is the moment of inertia of the disk?
(c) Find the angular acceleration of the disk as it slows
down.
(d) Find the torque that...

A top is a toy that is made to spin on its pointed end by
pulling on a string wrapped around the body of the top. The string
has a length of 66 cm and is wound around the top at a spot where
its radius is 1.4 cm. The thickness of the string is negligible.
The top is initially at rest. Someone pulls the free end of the
string, thereby unwinding it and giving the top an angular
acceleration...

A flywheel in a motor is spinning at 550 rpm when a power
failure suddenly occurs. The flywheel has mass 40.0 kg and diameter
75.0 cm . The power is off for 40.0 s , and during this time the
flywheel slows down uniformly due to friction in its axle bearings.
During the time the power is off, the flywheel makes 210 complete
revolutions.
A) At what rate is the flywheel spinning when the power comes back
on? Answer in...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 19 minutes ago

asked 31 minutes ago

asked 34 minutes ago

asked 46 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago