According to Kepler's 3rd law, we expect:
A. A more distant planet, e.g. Jupiter, to spin about its axis faster than the Earth
B. A more distant planet to spin about its axis slower than the Earth
C. An interior planet, e.g. Venus, to spin about its axis faster than the Earth
D. none of the above
Answer: D. none of the above
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Which statement about our current knowledge of elements is FALSE?
A) We now know of more than 110 elements, both natural and man-made. B) 81 stable elements have been found on Earth. C) 10 radioactive elements are also found on Earth. D) We have now produced over 50 radioactive elements not occurring in nature. E) Technetium is found in giant stars, but not yet in nature on the Earth.
During a lunar eclipse, the Moon, Earth, and Sun all lie on the same line, with the Earth between the Moon and the Sun. The Moon has a mass of 7.36 × 1022 kg; the Earth has a mass of 5.98 × 1024 kg; and the Sun has a mass of 1.99 × 1030 kg
The separation between the Moon and the Earth is given by 3.84 × 108 m; the separation between the Earth and the Sun is given by 1.496 × 1011 m. (a) Calculate the force exerted on the Earth by the Moon. (b) Calculate the force exerted on the Earth by the Sun. (c) Calculate the net force exerted on the Earth by the Moon and the Sun.
What are the dark regions that give the Sun's photosphere a mottled appearance?
a. CMEs b. sunspots c. spicules d. granules e. flares
A block is pulled across a floor as shown in the vector diagram. The force vector F has the greater component in the
1) horizontal direction, 2) vertical direction, and this component is 3) larger than the vector F. 4) smaller than the vector F. 5) equal to the vector F.