What is the speed of a 4-kg ball with a momentum of 12 kg?m/s?
A) 3 m/s
B) 4 m/s
C) 12 m/s
D) 48 m/s
E) none of the above
Answer: A
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What is an accretion disk?
A) a disk of hot gas swirling rapidly around a white dwarf, neutron star, or black hole B) any flattened disk in space, such as the disk of the Milky Way Galaxy C) a stream of gas flowing from one star to its binary companion star D) a disk of material found around every white dwarf in the Milky Way Galaxy
How are stars being formed in the Eagle Nebula?
A.) The whole Nebula is unstable to collapse. B.) The dust column is twisting and fragmenting into stars. C.) Shock waves from heated gas are crashing into colder gas and compressing it, allowing stars to form. D.) A passing pulsar is compressing portions of the nebula with its jets. E.) No stars are forming. All the brights stars seen are actually outside the Nebula.
At a certain point in space there is a potential of 400 V. What is the potential energy of a +2-?C charge at that point in space?
A) 80 × 10-6 J B) 800 J C) 400 J D) 200 J E) 8 × 10-4 J
The choices describe four hypothetical planets. Which one's surface would you expect to be most crowded with impact craters? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar system.)
A) Size: same as the Moon Distance from Sun: same as Mars Rotation rate: once every 10 days B) Size: twice as big as Earth Distance from Sun: same as Mercury Rotation rate: once every 6 months C) Size: same as Mars Distance from Sun: same as Earth Rotation rate: once every 18 hours D) Size: same as Venus Distance from Sun: same as Mars Rotation rate: once every 25 hours