Each of the two grinding wheels has a diameter of 5.2 in., a thickness of 0.75 in., and a specific weight of 493 lb/ft3. when switched on, the machine accelerates from rest to its operating speed of 3435 rev/min in 5.0 sec. when switched off, it comes to rest in 38 sec. determine the magnitudes of the motor torque and the frictional moment, assuming that each is constant. neglect the effects of the inertia of the rotating motor armature and assume that the grinding wheels are uniform disks.

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

Aphoton is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized. very far away from the nucleus, the released electron has a velocity of 750,000 m/s. what was the wavelength of the absorbed photon?

As the distance from a magnet increases, what happens to the magnet force?