A 1.15-kg grinding wheel 22.0 cm in diameter is spinning counterclockwise at a rate of 20.0 revolutions per second
When the power to the grinder is turned off, the grinding wheel slows with constant angular acceleration and takes 80.0 s to come to a rest.
(a) What was the angular acceleration (in rad/s2 ) of the grinding wheel as it came to rest if we take a counterclockwise rotation as positive?
(b) How many revolutions did the wheel make during the time it was coming to rest?
(a) -1.57 rad/s2 (b) 800 revolutions
You might also like to view...
Three capacitors, of capacitance 5.00 ?F, 10.0 ?F, and 50.0 ?F, are connected in series across a 12.0-V voltage source
(a) How much charge is stored in the 5.00-?F capacitor? (b) What is the potential difference across the 10.0-?F capacitor?
The most powerful agent of erosion is
A) stream flow. B) glacial action. C) action from waves and ocean currents. D) wind.
When an object is at rest on the Earth, the gravitational force disappears
Indicate whether the statement is true or false
Energy in the Electric Field: Each plate of a parallel-plate air-filled capacitor has an area of 0.0040 m2, and the separation of the plates is 0.020 mm. An electric field of 8.2 × 106 N/C is present between the plates. What is the energy density in the region between the plates? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 300 J/m3 B. 200 J/m3 C. 400 J/m3 D. 500 J/m3 E. 610 J/m3