More than 96% of the mass of living cells are made of
A) carbon and hydrogen
B) carbon
C) carbon, hydrogen, oxygen, and nitrogen
D) hydrogen and oxygen
C
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What would the spectrum of hydrogen look like if we could see into the ultraviolet?
What will be an ideal response?
Electromagnetic waves are generated whenever the ____
a. motion of any particle is changed
b. motion of any charged particle changes
c. motion of a positively charged particle is changed
d. motion of a negatively charged particle is changed
e. acceleration of any charged particle is changed
A 4-kg object falls vertically a distance of 5 m. Its potential energy has changed by approximately how much?
a. It has increased by 20 J. b. It has decreased by 200 J. c. It has decreased by 20 J. d. It has increased by 200 J.
Isaac Newton's contributions to physics include
a. the laws of motion b. the law of universal gravitation c. invention of the calculus d. the invention of the reflecting telescope e. all of the above