Question

A disc has a speed of 1200 rpm and it is made to slow down at
a uniform rate of 4 rad/s2.Calculate the number of revolution it
makes before coming to rest?

Answer #1

A compact disc rotates from rest up to an angular speed of 31.6
rad/s in a time of 0.913 s.
(a) What is the angular acceleration of the disc, assuming the
angular acceleration is uniform?
______________ rad/s2
(b) Through what angle does the disc turn while coming up to
speed?
rad
(c) If the radius of the disc is 4.45 cm, find the tangential
speed of a microbe riding on the rim of the disc.
____________ m/s
(d) What is...

Disc jockeys (DJs) use a turntable in applying their trade,
often using their hand to speed up or slow down a disc record so as
to produce a desired change in the sound. Suppose DJ Trick wants to
slow down a record initially rotating clockwise (as viewed from
above) with an angular speed of 32.1 rpm to an angular speed of
23.3 rpm. The record has a rotational inertia of
0.012 kg · m2
and a radius of 0.15 m....

1.An automobile engine slows down from 3500 rpm to 1200 rpm in
2.1 s .Calculate the total number of revolutions the engine makes
in this time. Express your answer as an integer.
2.Determine the moment of inertia of a 9.50 kg sphere of radius
0.387 m when the axis of rotation is through its center.

The
engine of a car is initially rotating at 5,600 rpm and after 4.0
seconds it has reduced its revs to 2,500 rpm.
1. the car reduces the engine revolutions, therefore its
angular acceleration and can give us a value of __________.
2. the angular speed of 5600 rpm is equivalent to _________
rad / s
3. the angular speed of 2500 rpm is equivalent to _________
rad / s
4. the angular acceleration is _________ rad / s2^
5....

A record player, or phonograph, is a device used to spin a vinyl
disc upon which sound waveforms are imprinted, and in this way,
play music. Starting from rest, a particular record player achieves
the constant angular speed at which music is played in 4.50 s with
a constant angular acceleration of0.7757 rad/s2. The album Led
Zeppelin IV is 42 minutes and 34 seconds in duration. After the
entire album is played, the record player requires 8.00 s to come...

You have a horizontal grindstone (a disk) that is 86 kg, has a
0.38 m radius, is turning at 88 rpm (in the positive direction),
and you press a steel axe against the edge with a force of 18 N in
the radial direction.
Assuming that the kinetic coefficient of friction between steel
and stone is 0.20, calculate the angular acceleration of the
grindstone in rad/s2.
What is the number of turns, N, that the stone will make before
coming...

You have a grindstone (a disk) that is 91.0 kg, has a 0.370-m
radius, and is turning at 68.0 rpm, and you press a steel axe
against it with a radial force of 11.0 N.
(a)
Assuming the kinetic coefficient of friction between steel and
stone is 0.50, calculate the angular acceleration (in
rad/s2) of the grindstone. (Indicate the direction with
the sign of your answer.)
_____rad/s2
(b)
How many turns (in rev) will the stone make before coming to...

1. A dentist using a dental drill brings it from rest to maximum
operating speed of 364,000 rpm in 3.2 s. Assume that the drill
accelerates at a constant rate during this time.
(a) What is the angular acceleration of the drill in
rev/s2?
rev/s2
(b) Find the number of revolutions the drill bit makes during
the 3.2 s time interval.
rev
2. In a laundromat, during the spin-dry cycle of a washer, the
rotating tub goes from rest to...

1) A centrifuge in a medical laboratory rotates at an angular
speed of 3,650 rev/min. When switched off, it rotates through 54.0
revolutions before coming to rest. Find the constant angular
acceleration (in rad/s2) of the
centrifuge.
1
rad/s2
2) The diameters of the main
rotor and tail rotor of a single-engine helicopter are 7.59 m and
0.98 m, respectively. The respective rotational speeds are 451
rev/min and 4,132 rev/min. Calculate the speeds of the tips of both
rotors.
main rotor ...

---- A centrifuge is a common laboratory instrument that
separates components of differing densities in solution. This is
accomplished by spinning a sample around in a circle with a large
angular speed. Suppose that after a centrifuge in a medical
laboratory is turned off, it continues to rotate with a constant
angular deceleration for 10.7 s before coming to rest.
A) If its initial angular speed was 3830 rpm , what is the
magnitude of its angular deceleration?
B) How...

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