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 radio-controlled car increases its kinetic energy from 4 J to 12 J over a distance of 2 m. What was the average net force on the car during this interval?
If the brakes are applied for 3.0 s, how fast is the car going at the end of the braking period? How far has it gone from its start?
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