The number of ____ in the nucleus determines what element the nucleus is

a. protons
b. electrons
c. neutrons
d. None of these determines the element.
e. All of these determine the element.


a

Physics & Space Science

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The Milky Way galaxy is part of

a. the Virgo cluster. b. the Large Magellanic Cloud. c. the Small Magellanic Cloud. d. the Local Group. e. a rich cluster.

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Consider a satellite (whose mass is m) orbiting the earth (whose mass is M). If we use the formula Vg = -GMm/r for the gravitational potential energy in this situation, the earth/satellite system’s total energy E turns out to be negative. With respect to the total energy of what situation is E negative?

A. The satellite at rest at the earth’s surface B. The satellite at rest at the earth’s center C. The satellite orbiting just above the earth’s surface D. The satellite at rest at infinity E. Some other situation (specify

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If we could put all the asteroids together, their total mass would be

A) much less than the mass of any terrestrial planet. B) about the mass of Mercury. C) about the mass of Earth. D) greater than the mass of Earth but less than the mass of Jupiter.

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What is the wavelength of a photon having the same momentum as an electron that is traveling at 7.5 km/s? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg)

What will be an ideal response?

Physics & Space Science