X-ray bursts and gamma ray bursts have the same distribution pattern in the sky
Indicate whether the statement is true or false
FALSE
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Which of the following has the effect of reducing the gravitational force between two objects?
A) Increasing the mass of either one of the objects. B) Moving the two objects closer together. C) Both of the above. D) Moving the two objects farther apart. E) None of the above.
If an electron is released at the equator and falls toward the Earth under the influence of gravity, the magnetic force on the electron will be toward the:
a. south. b. east. c. west. d. north.
The Milky Way is
A) a spiral galaxy. B) an elliptical galaxy. C) an irregular galaxy. D) a galaxy in the making. E) the remains of a galaxy that has run its life course.
The half-life of radon-222 is 3.83 d. If a sample of radon initially contains 6.00 × 108 radon atoms, how many of them are left after 10.0 d?
A) 9.82 × 107 B) 7.67 × 107 C) 8.34 × 108 D) 7.29 × 108 E) 8.56 × 108