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Page 458 - And show me how they calculated the initiatory speed of our car?" "Yes, my worthy friend; taking into consideration all the elements of the problem, the distance from the center of the earth to the center of the moon...
Page 67 - Any two bodies in the universe attract each other with a force which is directly proportional to the product of the masses and inversely proportional to the square of the distance between them.
Page 393 - The magnifying power of an astronomical telescope is therefore the focal length of the objective divided by the focal length of the eyepiece. It...
Page 22 - Archimedes stated that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid.
Page 84 - Every body continues in its state of rest or uniform motion in a straight line, except in so far as it is compelled to change that state by a force impressed upon it.
Page 367 - Index of refraction. The ratio of the speed of light in air to its speed in any other medium is called the index of refraction of that medium.
Page 260 - The resistance of any conductor is directly proportional to its length and inversely proportional to the area of its cross section or to the square of its diameter.
Page 60 - ... is, the resultant of two parallel forces acting in the same direction is equal to the sum of the two forces.
Page 62 - For in 79 it was shown that if any one force is to have the same effect upon a body as two forces acting simultaneously, it must be represented by the diagonal of a parallelogram the sides of which represent the two forces. Hence, conversely, if two forces are to be equivalent in their...
Page 2 - Thus, there are 12 inches in a foot, 3 feet in a yard, 5^- yards in a rod, 1760 yards in a mile, etc.

About the author (1922)

An American experimental physicist, Robert Millikan graduated from Oberlin College in 1891 and received his M.A. there in 1893. He earned his Ph.D. from Columbia University in 1895. One year later, Millikan joined the faculty at the University of Chicago and remained there until 1921, with the exception of the time he spent in government and military service during World War I. From Chicago Millikan went to the California Institute of Technology, where he spent the rest of his career. Millikan made the first determination of the charge of the electron and of Planck's constant. He was awarded the 1923 Nobel Prize in physics for these contributions. The determination of the charge on the electron proved experimentally that electrons are particles of electricity. Millikan accomplished this feat by designing an experiment studying the fall of oil droplets in an electric field. He conjectured that the droplets would take up integral multiples of electrical charge. By measuring the strength of the field required to counteract the gravitational force on the droplets, he was able to compute a highly accurate unit charge for the particle. Millikan also studied the photoelectric effect experimentally in 1916, confirming Albert Einstein's equation relating the kinetic energy of a particle emitted by incident radiation to the frequency of that radiation. Until his retirement, Millikan studied cosmic rays and the ultraviolet spectra of many elements.

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