# physics

A variable-speed drill, initially turning at 250 rpm, speeds up to 1300 rpm in a time interval of 0.1 s. What is its average rotational acceleration?

1. 👍 1
2. 👎 0
3. 👁 240
1. {[(1300 - 250) / 60] * 2 π / 0.1} rad/s^2

1. 👍 1
2. 👎 0

## Similar Questions

1. ### Physics

A potter’s wheel with rotational inertia of 45 kg m2, is spinning freely at 40 rpm. The potter drops a lump of clay onto the wheel where it sticks a distance 1.2 m from the rotational axis at the wheel’s center. If the

asked by Sarah on June 29, 2009
2. ### phy

A certain CD has a playing time of 72 minutes. When the music starts, the CD is rotating at an angular speed of 4.8 102 revolutions per minute (rpm). At the end of the music, the CD is rotating at 2.1 102 rpm. Find the magnitude

asked by nn on November 8, 2015
3. ### Physics

If the rotational speed of a CD changes from 650 rpm to 250 rpm as it plays 30 minutes of music, what is the CD's average rotational acceleration?

asked by Beth on December 2, 2018
4. ### Physics

A certain CD has a playing time of 76 minutes. When the music starts, the CD is rotating at an angular speed of 4.8 102 revolutions per minute (rpm). At the end of the music, the CD is rotating at 2.1 102 rpm. Find the magnitude

asked by John on March 24, 2008
5. ### physics

A high-speed drill rotating ccw at 2300 rpm comes to a halt in 2.9 s .

asked by Anonymous on October 1, 2016
1. ### Physics

A coin is placced 12.0 cm from the axis of a roatating turntable of variable speed. When the speed of the turntable is slowly incraeased, the coin remains fixed on the turntable until a rate of 50 rpm is reached at which point the

asked by Physics on September 5, 2009
2. ### Physics

3) Joe has a playing time of 74 minutes. When the music starts, the CD rotating at an angular speed of 480 revolutions per minute (rpm). At the end of the music, the CD is rotating at 210 rpm. Find the magnitude of the average

asked by Bob on December 21, 2009
3. ### physivs

A certain CD has a playing time of 68 minutes. When the music starts, the CD is rotating at an angular speed of 4.8 102 revolutions per minute (rpm). At the end of the music, the CD is rotating at 2.1 102 rpm. Find the magnitude

asked by Anonymous on December 4, 2010
4. ### Physics

A helicopter hovers above the north magnetic field pole in a magnetic filed of magnitude 0.5G perpendicular to the ground. The helicopter rotors are 10m long, are made of aluminum, and rotate about the hub with a rotational speed

asked by Jasmine on November 13, 2011
5. ### Physics

A helicopter hovers above the north magnetic field pole in a magnetic filed of magnitude 0.5G perpendicular to the ground. The helicopter rotors are 10m long, are made of aluminum, and rotate about the hub with a rotational speed

asked by Jasmine on November 13, 2011
6. ### Physics

The crankshaft of an engine increases its spin from 1,200 rpm to 1,500 rpm in 0.50 s. What is its angular acceleration

asked by Ron on December 11, 2014