Atmospheric electric field
A spherical water drop 1.30 µm in diameter is suspended in calm air owing to a downward-directed atmospheric electric field E = 512 N/C.
a) What is the weight of the drop?
b) How many excess electrons does it have?
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A slingshot fires a pebble from the top of a building at a speed of 13.0 m/s. The building is 35.0 m tall. Ignoring air resistance, find the speed with which the pebble strikes the ground when the pebble is fired (a) horizontally, (b) vertically s
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