The number of protons in the nucleus of an atom tells which element it is
a. True
b. False
Indicate whether the statement is true or false
True
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What conditions are thought to be necessary for a terrestrial planet to have a strong magnetic field?
A) a molten metallic core only B) fast rotation only C) a rocky mantle only D) both a molten metallic core and reasonably fast rotation E) both a metal core and a rocky mantle
Which statement is correct about the relationship between the average speed and the magnitude of the average velocity for any motion?
A) The average speed is always one-half the magnitude of the average velocity. B) The average speed is always greater than or equal to the magnitude of the average velocity. C) The average speed can be less than, greater than or equal to the magnitude of the average velocity. D) The average speed is always less than or equal to the magnitude of the average velocity. E) The average speed is always equal to the magnitude of the average velocity.
Based on Mercury's peak temperature of about 700 K, what would the average molecular speed of carbon dioxide be? How does this compare to Mercury's escape velocity? If Mercury's atmosphere initially had substantial carbon dioxide, in line with what
is believed about the early atmospheres of the other terrestrial planets, do you think Mercury would have retained this atmosphere? Why/why not? Would your answer change if you considered only Mercury's coldest regions that are around 125 K?
What must the initial state of motion of a charged particle be if it will follow a helical path in a magnetic field?
a) It must be moving at an angle that is neither parallel to nor perpendicular to the magnetic field. b) It must be moving parallel to the magnetic field. c) It must be moving perpendicular to the magnetic field. d) It must be moving in the direction opposite to the magnetic field. e) It must be initially at rest when it is placed in the magnetic field.