PHYS-216 Lecture 25: PHYS 216 Lecture 25: University Physics I: Torque and Cross-products

An old 33 1/3 rpm turntable may be approximated by a cylindrical disk of mass 0.250 kg and a diameter of 31.0 cm. What average torque will bring it up to operating speed in 1.50 seconds starting from rest?

What is the net torque when you are holding a 10 lb weight 1 ft from your elbow (producing a clockwise torque) and your biceps is generating a 50 lb force with a moment arm of 3 in. (producing a counterclockwise torque)?

An old 33 1/3 rpm turntable may be approximated by a cylindricaldisk of mass 0.250 kg and a diameter of 31.0 cm.
a) What average torque will bring it up to operating speed in 1.50seconds starting from rest?
b) What net work is done on the disk in bringing it up to operatingspeed?