According to the planetary model, an atom is
A) made of protons, electrons, and ions.
B) made of protons and electrons.
C) impossible to visualize [or picture].
D) a single tiny object, not made of parts.
E) made of protons, electrons, and neutrons.
E
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Why should the experimenter avoid using the end of a meter stick when making a measurement?
A solid sphere, a solid cylinder, a spherical shell, and a hoop all have the same mass and radius. Each are rolling on a horizontal surface with the same center of mass speed, and then they roll up identical inclines. Which one goes the greatest distance up its incline?
a. the hoop b. the solid sphere c. the spherical shell d. the cylinder e. They all go the same distance up their inclines.
Planetary orbits
A) are evenly spaced throughout the solar system. B) are highly inclined to the ecliptic. C) are almost circular, with low eccentricities. D) have the Sun at their exact center. E) are spaced more closely together as they get further from the Sun.
The proton-proton chain requires a temperature of 100 million K to get started
Indicate whether the statement is true or false