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Question: A droplet 10 μm in radius will fall in air at a steady velocity of 1.1cm/s because its weight mg (m is its mass, g is the acceleration due to Earth's gravity) is balanced by the viscous force 6πηav (η is the viscosity of air, 18.2 μPas; a is the radius of the droplet; and v is the velocity of fall).
a. Use these data to find the radius of a droplet that falls with a velocity of 8.59 ×10-4 m/s.
b. When an electric field of 317.5kV/m is turned on, the droplet in (a) is observed to rise at a steady speed of 2.41 × 10-4 m/s.
c. Show that the upward electrical force on the droplet is 1.28 times the downward gravitational force mg.
d. To within a couple of electrons, how many excess electrons are there on this droplet?
e. What important conclusions do we draw from Millikan's measurements?
Below is the calculator result for the operation indicated. Enter the answer to the correct number of significant figures for this calculation, using the rules for significant figures. 3.82193 + 10.5861 = 14.40803
Prove that it is impossible for two reversible adiabatics to intersect.
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The long, straight wire AB shown in the following figure carries a current of I1 = 10.0 A. The rectangular loop whose long edges are parallel to the wire carries a current of I2 = 7.25 A. Find the magnitude and direction of the net force exerted o..
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