A machinist 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 21 rad/s. The wheel is run at that angular velocity for 39 s and then power is shut off. The wheel slows down uniformly at 2.2 rad/s2 until the wheel stops.

In this situation, the time interval of deceleration is closest to:

A) 14 s

B) 16 s

C) 10 s

D) 8 s

E) 12 s

Jessie ran 5000 meters from the cops and an average speed of 6 meters / second before he got caught . how long did he run?

Hydrogen and helium are both members of?

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field. it is in the opposite direction from that of the original external field. it has a direction determined entirely by the charge on its surface. it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0