Posted by Oisin on Tuesday, July 20, 2010 at 8:53am.
(i) 20N * 0.2 m * (angle in radians).
I cannot interpret your angle symbol, which shows up here as ,,a.
(ii) Angular acceleration rate = (Torque)/(Moment of inertia)
The torque is 4 N*m
Angular acceleration =
4 N*m/(8*.15^2 kg m^2) = 22.2 rad/s^2
Time required to rotate angle theta =
2*(theta)/(angular acceleration rate)
so for the first part 20N * 0.2m * 2pi is that correct?
also how did you get your torque?
(iii) What is the angular momentum of the wheel after this time?
You never said the angle turned was 2 pi. You typed 45,,a
Torque is force times lever arm (in this case, wheel radius)
(iii) Angular momentum after time T is
(Moment of inertia)*(angular velocity)
no i mean to convert 45degrees into rads you multiply by 2pi
thanks for your help
45 degrees is pi/4 radians. You multiply by pi/180 radians per degree, NOT 2 pi
how did u find the angular velocity?
im tryin to use v = wr but i dont know where to find the normal velocity of the rim
Physics... rotation - A constant force of 40 N is applied tangentially to the ...
physics - A bicycle wheel is mounted on a fixed, frictionless axle. A massless ...
physics - A bicycle wheel has a diameter of 64.2 cm and a mass of 1.79 kg. ...
physics - A bicycle wheel has a diameter of 57.7 cm and a mass of 2.66 kg. The ...
Physics - A pulley with a rotational interia of 4.4*10^-3 kg m^2 about its axle ...
physics - THe steering wheel of a car has a diameter of 60cm and turns a shaft ...
physics - A wheel rotates without friction about a stationary horizontal axis at...
Physics - The flywheel is initially at rest. A force of 250 N is applied ...
Physics - The combination of an applied force and a frictional force produces a ...
physics 101 - A solid uniform disk of mass 21kg and radius 85cm is at rest flat ...
For Further Reading