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

Physics & Space Science

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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?

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The most powerful agent of erosion is

A) stream flow. B) glacial action. C) action from waves and ocean currents. D) wind.

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When an object is at rest on the Earth, the gravitational force disappears

Indicate whether the statement is true or false

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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

Physics & Space Science