Light in vacuum is incident on a 32.0° with the normal to the surface. it refracts into the glass at an normal. what is the index of refraction of the glass? glass plate. in a vacuum the beam makes an angle of angle 21.0°

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: