If Copernicus overthrew the geocentric universe, what did Kepler overthrow?
What will be an ideal response?
uniform circular motion
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You are working in a library, reshelving books. You lift a book from the floor to the top shelf. The kinetic energy of the book on the floor was zero, and the kinetic energy of the book on the top shelf is zero, so there is no change in kinetic energy. Yet you did some work in lifting the book. Is the work-kinetic energy theorem violated?
1.Yes, it is violated because a force acting on the book should change the book's kinetic energy. 2.No, it is not violated because the book really does have a final velocity, but so does the entire system, so it is impossible to detect the book's motion. 3.Yes, it is violated because a force that acts on the book should change the book's velocity. 4.No, it is not violated because there are two forces that act on the book. One is the downward force that the Earth exerts on the book, which is counterbalanced by the upward force that you exert on the book. The total work done on the book, therefore, is zero, and is equal to its overall change in kinetic energy.
The approximate energy needed to ionize the n = 1 (the deepest) state in hydrogen is
a. 10 eV. b. 10 keV. c. 10 MeV. d. 10 GeV. e. 10 TeV.
When the IDL is crossed going from east to west, a day is ______________
Fill in the blank(s) with correct word
Bar magnets are moved into the wire coils in identical quick fashion. Voltage induced in each coil causes a current, as indicated on the galvanometer. Neglect the electrical resistance in the loops in the coil, and rank from highest to lowest the readings on the galvanometer.
