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In the Millikan oil-drop experiment illustrated in the figure below, an atomizer (a sprayer with a fine nozzle) is used to introduce many tiny droplets of oil between two oppositely charged parallel metal plates. Some of the droplets pick up one or more excess electrons. The charge on the plates is adjusted so that the electric force on the excess electrons exactly balances the weight of the droplet. The idea is to look for a droplet that has the smallest electric force and assume it has only one excess electron. Suppose we are using an electric field of 6. 104 N/C. The charge on one electron is about 1.6 10-19 C. Estimate the radius of an oil drop of density 854 kg/m3 for which its weight could be balanced by the electric force of this field on one electron.
Stone with a mass of 0.800 {rm kg} is attached to one end of a string 0.900 {rm m} long. The string will break if its tension exceeds 65.0 {rm N}. The stone is whirled in a horizontal circle on a frictionless tabletop; the other end of the string rem..
An 800-N man stands halfway up a 5 m long ladder of negligible weight. The base of the ladder is 3 m from the wall as shown. suppose that the wall-ladder contact is frictionless, wall pushes against the ladder with a force of what magnitude.
Two sound sources radiating in phase at a frequency of 580Hz interfere such that maxima are heard at angles of 0 and 24 from a line perpendicular to that joining the two sources. Find out the seperation between the two sources. The velocity of sou..
What is the diameter of a copper sphere that has the same mass as a 2.00 cm x 2.00cm x 2.00 cm cube of aluminum?
A charge of -2.95 µC is fixed at the center of a compass, What are the magnitude and direction of the net electrostatic force acting on the charge at the center
A jogger on a circular track that has the radius of 0.150km runs a distance of 1.10km. What angular distance does the jogger covers in radians.
A box is dropped from the height of 2000 m. Find the time taken by the box to reach the ground
A small glass bead has been charged to + 10nC. A metal ball bearing 1.90cm above the bead feels a 1.20×10-2 N downward electric force. What is the charge on ball bearing.
The electric field in a region of space has the components Ey = Ez = 0 and Ex = (5.90 N/(C·m))x. Point A is on the y axis at y = 4.30 m, What is the potential difference (in V) VB - VA
Object 1 has a mass m1 and a velocity 1 = (2.87 m/s). Object 2 has a mass m2 and a velocity 2 = (3.01 m/s). The total momentum of these two objects has a magnitude of 18.0 kg • m/s and points in a direction 66.5° above the positive x-axis. Find out m..
You have a flashlight that uses 0.75 watts of power and requires 1.5 volt battery, How many joules of energy are used by the flashlight in 15 minutes
At one instant a bicyclist is 40m due east of a park's flagpole, going due south with a speed of 10m/s. Then 30.0s later, the cyclist is 40m due north of the flagpole.
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