Suppose a particle’s four-momentum vector has components [pt, px, py, pz] = [5 kg, 3 kg, 0, 0]. What is this particle’s mass?
A. 5 kg
B. 8 kg
C. 4 kg
D. 3 kg
E. 
kg
F. Other (specify)
C. 4 kg
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Earth and the Moon could not have condensed from the same materials because they have different densities and compositions
a. True b. False Indicate whether the statement is true or false
The mean free path of molecules in a gas is:
A. the average distance a molecule travels before escaping B. the average distance a molecule travels between collisions C. the greatest distance a molecule travels between collisions D. the shortest distance a molecule travels between collisions E. the average distance a molecule travels before splitting apart
Which of the following is a unit of power?
a. kilowatt-hour b. newton c. joules per second d. foot-pound e. none of these
The two types of bright nebulae are emission nebulae and ______________ nebulae
Fill in the blank(s) with correct word