Which of the following statements about ozone (in Earth's stratosphere) is not true?
A) The presence of ozone was crucial to the origin of life.
B) If the ozone layer is depleted, we can expect the rate of mutations in land-based life-forms to increase significantly.
C) Ozone absorbs ultraviolet light from the Sun.
D) The ozone hole occurring each spring over Antarctica appears to be caused by human-made CFCs.
A
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At the center of the Sun, fusion converts hydrogen into
A) hydrogen compounds. B) plasma. C) radiation and elements like carbon and nitrogen. D) radioactive elements like uranium and plutonium. E) helium, energy, and neutrinos.
Compared to other systems for generating electrical energy, nuclear energy is relatively unsafe
What will be an ideal response?
Instructions: On occasion, the notation 
= [A, ?] will be a shorthand notation for 
.
Given the statement that 
, what can we conclude?
A.
and 
.B.
.C.
and 
.D.
E.
Popeye, of mass 75.0 kg, has just downed a can of spinach. He accelerates quickly and stops Bluto, of mass 650 kg (Bluto is very dense), who is charging in at 15.0 m/s. What was Popeye's speed?
a. 1.73 m/s b. 48.3 m/s c. 120 m/s d. 130 m/s e. 15.0 m/s