A machinist turns on the power on to a grinding wheel at time t = 0 s. The wheel accelerates uniformly from rest for 10 s and reaches the operating angular speed of The wheel is run at that angular velocity for 40 s and then power is shut off
The wheel slows down uniformly at until the wheel stops. For how long a time after the power is shut off does it take the wheel to stop? A) 64 s
B) 62 s
C) 66 s
D) 68 s
E) 70 s
A
You might also like to view...
Why is the Coriolis effect so weak on Venus?
A) because Venus rotates so slowly B) because Venus is so hot C) because Venus has such a thick atmosphere D) because Venus has such a strong greenhouse effect
A BL Lac object is the same as a
a. Type 1 Seyfert. b. Type 2 Seyfert. c. double-lobed radio galaxy. d. blazar. e. quasar.
When the temperature of the Sun's core goes up, what happens next?
A) Fusion reactions slow down, core shrinks and heats. B) Fusion reactions speed up, core expands and cools. C) Fusion reactions speed up, the core shrinks and cools. D) Fusion reactions slow down, the core expands and heats.
A 500-W device is connected to a 120-V ac power source. What peak current flows through this device?
A) 4.2 A B) 5.9 A C) 120 A D) 150 A E) 170 A