Amachinist turns the power on to a grinding wheel, which is at rest at time t = 0.00 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 25 rad/s. the wheel is run at that angular velocity for 37 s and then power is shut off. the wheel decelerates uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of angular deceleration (slowing down) is closest to:
a) 17 s b) 15 s c) 19 s d) 21 s e) 23 s

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

How would doubling the made of an object change the objects potential energy

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34