The identical 50-kg masses are held at the corners of an equilateral triangle, 30 cm on each side
If one of the masses is released, what is its initial acceleration, if the only forces acting on it are the gravitational forces due to the other two masses? A) 3.7 × 10-8 m/s2
B) 2.5 × 10-8 m/s2
C) 1.9 × 10-8 m/s2
D) 4.2 × 10-8 m/s2
E) 6.4 × 10-8 m/s2
E
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The most basic difference between elliptical galaxies and spiral galaxies is that
A) elliptical galaxies lack anything resembling the halo of a spiral galaxy. B) elliptical galaxies have a spheroidal component (of stars distributed spherically about the galactic center), and spiral galaxies do not. C) elliptical galaxies lack anything resembling the disk of a spiral galaxy. D) elliptical galaxies are very old and spiral galaxies are very young.
Which of the following is closest in mass to a white dwarf?
A) the Sun B) the Moon C) the Earth D) Jupiter
A particular material has an index of refraction of 2.75 . What percent of the speed of light in vacuum is the speed of light in the material?
a. 36% b. 10% c. 8% d. 89%
A fountain sends water to a height of 50 m. What must be the pressurization (above atmospheric) of the underground water system? (1 atm = 105 N/m2)
a. 1 atm c. 7.2 atm b. 4.9 atm d. 9.8 atm