Two identical particles, each with a mass of 4.5 ?g and a charge of 30 nC, are moving directly toward each other with equal speeds of 4.0 m/s at an instant when the distance separating the two is equal to 25 cm. How far apart will they be when closest to one another?
a. 9.8 cm
b. 12 cm
c. 7.8 cm
d. 15 cm
e. 20 cm
c
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In the late 1800s, Kelvin and Helmholtz suggested that the Sun stayed hot because of gravitational contraction. What was the major drawback to this idea?
A) It predicted that the Sun could shine for about 25 million years, but geologists had already found that Earth is much older than this. B) It predicted that the Sun would shrink noticeably as we watched it, but the Sun appears to be stable in size. C) It is physically impossible to generate heat simply by making a star shrink in size. D) It predicted that Earth would also shrink in size with time, which would make it impossible to have stable geology on our planet.
Mass 30.0 g is located at the origin. Where is mass 10.0 g located if the coordinates of the center of mass are (0.00 cm, 10.0 cm)?
A. (0.00 cm, 20.0 cm) B. (0.00 cm, 5.00 cm) C. (0.00 cm, 7.50 cm)
A comet grows tails (plasma tail and dust tail) when it comes close to the Sun. Which of the following diagrams shows a comet's tails correctly oriented as they appear along its orbit?
How many degrees as measured on the celestial sphere does the Moon cover as it moves during the course of one day?
5 degrees 36 degrees 13 degrees 25 degrees