The magnetic and rotational north poles on Earth are the same
Indicate whether the statement is true or false
FALSE
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If you represented each star by a grain of sand, about how much sand would it take to represent all the stars in the observable universe?
A) all the sand in a typical playground sandlot B) all the sand on Miami Beach C) all the sand on the beaches of California D) one cubic meter of sand E) all the sand on all the beaches on Earth
According to general relativity, what is a black hole?
A) a hole in the observable universe B) an object that cannot be seen C) a place where light travels slower than the normal speed of light D) a place where the strength of gravity is infinite
An eyeglass lens is cut with one surface having a radius R1 and the other surface having a radius R2, with R1 < R2 . Both positive radii are measured from the same side with R1 being the side closer to the eye. Is this convex-concave lens a converging lens or a diverging lens?
a. This is a converging lens. b. This is a diverging lens. c. This can be either a converging or diverging lens, as more information is needed for a final determination. d. This is neither, since a lens cannot be made this way.
Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the sun respectively. The ratio of the gravitational force exerted by the sun on sphere 1 to the pressure of solar radiation on sphere 1 is T1; the ratio for sphere 2 is T2 . The ratio of T2 to T1 is
a. 0.25. b. 0.50. c. 1.0. d. 2.0. e. 4.0.