Question

a. What is the angular momentum of a 2.8kg mill wheel, the
radius of which is it 18 cm when it rotates at 1300 rpm?

b.How many turns does the mill wheel make?

c. What torque is required to stop the mill wheel in 6.0s?

Answer #1

What is the angular momentum of a 2.8-kg uniform cylindrical
grinding wheel of radius 29 cm when rotating at 1200 rpm ?
How much torque is required to stop it in 4.0 s ?

On the Wheel of Fortune game show, a solid wheel (of radius 7.4
m and mass 10 kg) is given an initial counterclockwise angular
velocity of +1.11 rad/s. It then smoothly slows down and stops
after rotating through 3/4 of a turn.
(a) Find the frictional torque that acts to stop the
wheel.
= N · m
(b) Assuming that the torque is unchanged, but the mass of the
wheel is halved and its radius is doubled. How will this affect...

What is the angular momentum of a figure skater spinning at 2.3
rev/s with arms in close to her body, assuming her to be a uniform
cylinder with a height of 1.5 m, a radius of 16 cm , and a mass of
49 kg ?
How much torque(in magnitude) is required to slow her to a stop
in 4.8 s , assuming she does not move her arms?

What is the angular momentum of a figure skater spinning at
3.2rev/s with arms in close to her body, assuming her to be a
uniform cylinder with a height of 1.5m , a radius of 16cm , and a
mass of 55kg?
How much torque is required to slow her to a stop in 4.4s ,
assuming she does not move her arms?

A grinding wheel of radius 20.0 cm is initially spinning with an
angular speed of 2.0 rad/s. When the power of the grinder is
increased the angular speed increased to 10 rad/s over the next 5.0
s.
a. Calculate the avg. angular speed of the grindstone during the
5 seconds.
b. Calculate the angular acceleration of the grinding wheel
during the 5 seconds.
c. How many revolutions does the grindstone turn during the 5
seconds?

A wheel stars at rest, has a radius of 0.1m and has a moment of
inertia I=10kg*m^2. A constant torque of 3 N*m is applied to the
wheel to cause counter-clockwise angular acceleration
1) what will the angular velocity of the wheel be when the
angular displacement is 20*pi radians?
2) what will the tangentail speed of a point on the outer edge
of the wheel be when the angular velocirt of the wheel is your
answer to part 2?...

a. What is the angular momentum of a figure skater spinning at
2.0 rev/s with arms in close to her body, assuming her to be a
uniform cylinder with a height of 1 m, a radius of 0.2 m, and a
mass of 50 kg?
b. How much torque is required to slow her to a stop in 5.0 s,
assuming she does not move her arms?

10.
a) The angular speed of a motor wheel is increased from 1725 rpm to
3172 rpm in 15 seconds.
i) What is its angular acceleration?
ii) How many revolutions does the engine make during this
time?

A 2.0 kg bicycle wheel with a radius of 0.40 m turns at a
constant angular speed of 28 rad/s when a 0.35 kg reflector is at a
distance of 0.2 m from the axle. What is the angular speed of the
wheel when the reflector slides to a distance of 0.3 m from the
axle?
Answer in 3 decimal places, and include full equation
please.

A wheel of radius 0.168 m, which is moving initially at 33.0
m/s, rolls to a stop in 288 m. Calculate the magnitudes of
(a) its linear acceleration and
(b) its angular acceleration. (c)
The wheel's rotational inertia is 1.98 kg m2
about its central axis. Calculate the magnitude of the torque about
the central axis due to friction on the wheel.

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