An object that is 4.0 cm tall is placed 15 cm in front of a concave mirror of focal length 20 cm
(a) Where is the image formed and how far is it from the mirror?
(b) How tall is the image?
(a) 60 cm behind the mirror (b) 16 cm
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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)
In 2014, when scientists used a laser to simulate the conditions generated when a large impact hits a mixture of prebiotic molecules, they were able to produce
A) all 20 amino acids used in life B) all four DNA bases used in life C) complex carbohydrates D) simple proteins
Scientists who study the Universe as a whole are called _______________
Fill in the blank(s) with correct word
The Planck time is
A) the shortest time that has any physical meaning. B) the time required for pair creation. C) the time it takes for light to travel across--or around--the entire universe. D) the time when the cosmic background radiation originated. E) the time it takes for an electron in an unexcited hydrogen atom to orbit the nucleus one time.