What happens on or about March 20th, and what does the name signify?
What will be an ideal response?
The vernal equinox, because the days and nights are approximately equal in length.
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How was Earth's Moon formed, according to the currently most-accepted theory?
a) It formed from the collapsing protoplanetary disk at the same time as Earth. b) It was a passing body captured by Earth's gravity. c) It formed from debris produced by the collision of a Mars-sized object with the Earth. d) A gigantic volcano on Earth threw out the material that became the Moon. e) No one really knows.
During each cycle, a thermodynamic engine takes in 4.0 J of energy, does 1.0 J of work, and expels 3.0 J of energy. What is its efficiency?
What will be an ideal response?
The ground state is the lowest energy level in an atom
a. True b. False Indicate whether the statement is true or false
Which of the following methods used to determine the mass of a cluster of galaxies does not depend on Newton's law of gravity?
A) measuring the orbital velocities of galaxies in the cluster B) measuring the temperature of x-ray gas in the intracluster medium C) measuring the amount of distortion caused by gravitational lensing