Object A is more massive than object B. Which of the following statements is true?
A. Both object A and object B experience the same gravitational force.
B. Both object A and object B experience the same gravitational acceleration.
C. Object A experiences a greater gravitational force and gravitational acceleration than object B.
B. Both object A and object B experience the same gravitational acceleration.
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Why do we have seasons on Earth?
A) As Earth goes around the Sun and Earth's axis remains pointed toward Polaris, the Northern and Southern hemispheres alternately receive more and less direct sunlight. B) The tilt of Earth's axis constantly changes between 0 and 23 1/2°, giving us summer when Earth is tilted more and winter when it is straight up. C) Earth's distance from the Sun varies, so that it is summer when we are closer to the Sun and winter when we are farther from the Sun. D) Seasons are caused by the influence of the planet Jupiter on our orbit.
The rather simple idea that, unless disturbed, younger sedimentary layers overlie older layers, is referred to as the principle of
A) original horizontality. B) uniformitarianism. C) faunal succession. D) superposition.
For an observer on Uranus, the ecliptic passes only a few degrees from the celestial poles
Indicate whether the statement is true or false
One of the radioactive isotopes that fell on the land and got into the food chain after the Chernobyl accident was 131I. Its half-life is 8 days
How long was it, following its deposit on the land, before its radioactivity had fallen to 1/32--about 3%--of its initial value? A) 16 days B) several years C) 48 days D) 40 days E) It is impossible to say, even approximately.