____________________ are groups of 100,000 to 1,000,000 population II stars firmly bound by gravity
Fill in the blank(s) with correct word
Globular clusters
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Suppose we subject a golf ball and a more massive lead ball to identical net forces. Then, compared to the golf ball, the lead ball must have
A) a larger acceleration. B) a larger speed. C) a smaller speed. D) a smaller acceleration. E) None of the above answers is necessarily true.
In an analysis relating Bohr's theory to the de Broglie wavelength of electrons, when an electron moves from the n = 1 level to the n = 2 level, the circumference for its orbit becomes 4 times greater. This occurs because
a. there are four times as many wavelengths in the new orbit. b. the wavelength of the electron becomes four times as long. c. there are twice as many wavelengths, and each wavelength is twice as long. d. the electron is moving four times as fast.
Why do scientists use the scientific method?
What will be an ideal response?
The Heisenberg uncertainty principle states that
A) Planck's constant sets a limit on accuracy of measurements. B) we can't simultaneously measure exactly both the position and momentum of a particle. C) we can't simultaneously measure exactly a particle's energy and time having that energy. D) all of the above