For the following circuit, assume the diodes are identical and ideal. let v1 = 12v, v2 = 3v, r1 = 6kω and r2 = 6kω. assume that the diode voltages and currents follow the standard convention on polarity and direction. solve for id1. give the answer in units of ma but omit units.

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to:

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block