# physics

A 4.0 kg pulley of radius 0.15 m is pivoted about an axis through its center. What constant torque is required for the pulley to reach an angular speed of 25 rad/s after rotating 6.0 revolutions, starting from rest?

What moment of inertia do I use to figure our the torque?

1. 👍 0
2. 👎 0
3. 👁 218
1. I would model the pulley as a flat disk.
http://hyperphysics.phy-astr.gsu.edu/hbase/tdisc.html
1/2 m r^2

1. 👍 0
2. 👎 0

## Similar Questions

1. ### physics

A 4.0 kg pulley of radius 0.15 m is pivoted about an axis through its center. What constant torque is required for the pulley to reach an angular speed of 25 rad/s after rotating 6.0 revolutions, starting from rest?

asked by erik on December 11, 2010
2. ### Physics

Two masses, mA = 40.0 kg and mB = 55.0 kg, are connected by a massless cord that passes over a pulley that is free to rotate about a fixed axis. This device is known as an Atwood’s Machine. The pulley is a solid cylinder of

asked by Cheese on October 23, 2014
3. ### physics

A pulley of radius .10 m and having a rotational inertia of .30 kg-m^2 has a cord wrapped around it and attached to a 6.00 kg mass as shown. The pulley is free to rotate about a fixed axis through its center. The mass is allowed

asked by Anonymous on April 13, 2013
4. ### math (Calculus)

A circular pulley with a radius of 10 cm is turning at 12 revolutions per minute. How fast is a point on the edge of the pulley rising when it is 5 cm higher than the center of the pulley?

asked by Jordan on January 9, 2012
5. ### Help Math

A circular pulley with a radius of 10 cm is turning at 12 revolutions per minute. How fast is a point on the edge of the pulley rising when it is 5 cm higher than the center of the pulley?

asked by Jordan on January 9, 2012
6. ### physics help

A homogeneous disk of mass m and of radius r free to rotate without friction about its horizontal axis, is used used as a pulley. An extensible string of negligible mass is wound around this pulley and a mass M is connected to its

asked by Cynthia on February 9, 2016
7. ### Need help at this very minute with physics

In Figure 10-53, two blocks, of mass m1 =400 g and m2 =600 g, are connected by a massless cord that is wrapped around a uniform disk of mass M = 500 g and radius R = 12.0 cm. The disk can rotate without friction about a fixed

asked by John on December 1, 2006

four pulleys are connected by two belts. Pulley A (radius 15cm) is the drive pulley and it rotates at 10 rad/s. Pulley B (radius 10 cm) is connected by belt 1 to pulley A. Pulley B' (radius 5cm) is concentric with pulley B and is

asked by Dawn on November 17, 2006
9. ### PHYSICS

A block of mass 0.86 kg is suspended by a string which is wrapped so that it is at a radius of 0.061 m from the center of a pulley. The moment of inertia of the pulley is 4.60×10-3 kg·m2. There is friction as the pulley turns.

asked by Emily on October 21, 2012
10. ### Physics

A square metal plate with length L= 0.14 m on each side is pivoted about an axis through the center point O, perpendicular to the plate. Calculate the net torque about this axis due to the three forces shown that act at the

asked by Anonymous on October 28, 2016

More Similar Questions