Agrinding disk (mass 2 kg and radius 0.10 m) is spinning at 800 rpm (revolutions per minute). you press a piece of metal against the edge of the disk and the disk slows to 740 rpm after a time of 10 seconds. assume that the torque that you apply on the disk is constant.
a. what is 800 rpm in the unit rad/s?
b. what is 740 rpm in the unit rad/s?
c. what is the angular acceleration of the disk?
d. what is the moment of inertia of the disk?
e. how much torque do you apply on the disk?
f. how much impulse do you apply on the disk?
g. how much work do you do on the disk?

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.