What is a Starburst Galaxy?
A.) A galaxy whose spiral arms have been stretched out into a star-like shape.
B.) A galaxy with a supermassive black hole at the center.
C.) A galaxy with a very high rate of star formation.
D.) A galaxy with multiple supernovae.
E.) A galaxy with a lot of gamma-ray emission.
Answer: C.) A galaxy with a very high rate of star formation.
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We are not yet capable of detecting life on planets around other stars. But as our technology develops, our first real chance of detecting such life will probably come from ________
A) determining the orbital properties of the planets B) examining high-resolution images of the planets made by orbiting telescopes C) examining spectral lines from the atmospheres of distant planets D) sending spacecraft to study the planets up close
A rectangular box of negligible mass measures 5.0 m long, 1.0 m wide, and 0.50 m high. How many kilograms of mass can be loaded onto the box before it sinks in a lake having water of density 1000 kg/m3?
A) 1.5 × 103 kg B) 2.5 × 103 kg C) 0.50 × 103 kg D) 3.5 × 103 kg
A nonconducting sphere contains positive charge distributed uniformly throughout its volume. Which statements about the potential due to this sphere are true? All potentials are measured relative to infinity
(There may be more than one correct choice.) A) The potential is highest at the center of the sphere. B) The potential at the center of the sphere is zero. C) The potential at the center of the sphere is the same as the potential at the surface. D) The potential at the surface is higher than the potential at the center. E) The potential at the center is the same as the potential at infinity.
Two flat glass plates are in contact along one end and are separated by a sheet of paper 3.3 × 10^?6 m thick at the other end. The top plate is illuminated by a monochromatic light source of wavelength 514 nm. How many dark parallel bands will be evident across the top plate? (1 nm = 10?9 m)
a. 7 b. 11 c. 6 d. 13 e. 9