Blade Disc

The circular blade on a radial arm saw is turning at 265rad/s. Find net torque.?
The circular blade on a radial arm saw is turning at 265 rad/s at the instant the motor is turned off. In 12.0 s the speed of the blade is reduced to 85 rad/s. Assume the blade to be a uniform solid disk of radius 0.140 m and mass 0.400 kg. Find the net torque applied to the blade.
If T is torque, I is moment of inertia, and a is angular acceleration,
T = Ia (looks a lot like F = ma, yeah?)
Integrating (or using the equation for velocity vs time, if this is calculus-free physics),
v = v0 + at
where v is angular velocity at time t, v0 is the initial velocity, and angular acceleration is given above. combining the two equations,
v = v0 + (T/I)t = (265 /s) + [ T/ (1/2 mr^2) ] * (12 s) = 85 /s
where m=0.4 kg is the mass of the disk of radius r=0.14 m. Solve for torque T.
m
![]() |
![]() BLADE Blu ray Disc 2009 Blu Ray Disc WESLEY SNIPES STEPHEN DORFF US $10.29
|
![]() Blade Trinity DVD 2005 2 Disc Set Unrated US $5.00
|
![]() Blade II DVD 2002 2 Disc Set Two Disc Set US $5.00
|
![]() Black 110mm Diameter 30T Wood Cutting Saw Blade Disc US $7.92
|
![]() 106x20x16mm Glass Slate Cutting Wheel Disc Diamond Saw Blade US $10.95
|
![]() Blade Trilogy DVD 2005 5 Disc Set US $17.99
|
![]() Blade Blu ray Disc 2009 CanadianBlu Ray Disc US $9.99
|
![]() 114x20x18mm Circular Disc Cutting Wheel Diamond Saw Blade US $8.25
|
![]() Blades of Glory OOP Blu Ray disc NEW AND SEALED US $19.99
|
![]() 9 OD 40 Teeth Wood Cutting Circular Saw Blade Disc US $26.07
|
![]() Red 110mm x 20mm 40T Disc Wheel Slitting Saw Blade US $7.27
|
![]() Blade II DVD 2002 2 Disc Set Two Disc Set Wesley Snipes US $6.99
|
![]() Replacemebt 110mm 30T Cutting Blade Disc for Carpenter US $8.50
|
![]() Cuisinart Blade and Disc Holder BDH 2 US $19.95
|
![]() Cuisinart Little Pro Handy Prep Blades Discs US $9.95
|
![]() Tile Stone Cutting Wheel 113 x 20 x 18mm Diamond Disc Saw Blade US $10.30
|
| Powered by phpBay Pro |
American Psycho, Dark City, & Blade Runner Blu-rays plus a DVD (gasp!)


US $.99







































