A 1500-kg car moving at 25 m/s hits an initially uncompressed horizontal ideal spring with spring constant (force constant) of 2.0 × 106 N/m. What is the maximum distance the spring compresses?
A) 0.17 m
B) 0.34 m
C) 0.51 m
D) 0.68 m
D
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It's cold! You are sitting on what appears to be an ice-covered world (water ice). The Sun is low on the horizon and circles the horizon about once every 24 hours
Despite the low Sun, you can almost "feel" the skin cancers appearing on your exposed face (because there is little ozone to protect you). Despite these discomforts, you are pleased to find that the air is quite satisfactory; oxygen seems plentiful, and you are able to breathe even without the life-support belt.
Which of the following best summarizes what we mean by dark energy?
A) It is a name given to whatever is causing the expansion of the universe to accelerate with time. B) It is the energy contained in dark matter. C) It is the energy of black holes. D) It is a type of energy that is associated with the "dark side" of The Force that rules the cosmos.
Using K = 3/2 kT, what is the average kinetic energy of a He atom at:
(a) 10. K? (b) -196.°C? (c) 100.°C?
The greater amount of substance in a solution is generally called the
a. salt. b. solute. c. molar concentrate. d. solvent.