One of the first tests of the general theory of relativity was the ____
a. description of the orbit of the moon
b. determination of the speed of light as a constant
c. change in mass of a particle moving at a high speed
d. demonstration of a hammer and a feather falling at the same rate on the moon
e. determination of the rate of advance of the perihelion of Mercury's orbit
e
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Is the force holding the electrons into their atomic orbits in an individual atom basically the same as the force that hold the sun's planets in their orbits? Why or why not?
A) Yes; it is the force of gravity in both cases. B) Yes; it is the centrifugal force in both cases. C) No; the sun's energy source is nuclear fusion, and fusion does not occur within individual atoms. D) No; gravity holds the sun's planets in their orbits, while nuclear forces hold the electrons in their orbits. E) No; gravity holds planets in their orbits, while the electromagnetic force holds electrons in their orbits.
Tides are caused because different parts of the earth's oceans are at different distances from the moon
Indicate whether the statement is true or false
_____ is an example of a planet
A) Pluto B) Sirius C) Venus D) Rigel
Which of the following statements is true of the first reaction in the proton-proton chain?
A) It yields a helium atom. B) It emits a positron. C) It emits a gamma ray. D) It yields carbon dioxide.