Which of the following has NOT yet been observed in space?
A) formaldehyde
B) methyl alcohol
C) DNA
D) ammonia
E) hydrogen cyanide
C
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A neutral atom always contains
a. the same number of protons as it does neutrons. b. the same number of electrons as it does neutrons. c. the same number of protons as it does electrons. d. twice as many protons as it does neutrons. e. twice as many neutrons as it does protons.
A nearsighted person has a far point of 50. cm for one eye and 150. cm for the other. What power contact lenses allow the person to see distant objects?
What will be an ideal response?
You push your physics book across a table. The book weighs 8 N, you push with a steady 5 N force, and the force of friction against the book is 3 N. You push the book a distance of 2 m. The amount of work you do on the book is
A) zero. B) 6 J. C) 16 J. D) 10 J. E) impossible to tell without more information.
For a point on a spinning disc in uniform circular motion, which of the following is not constant?
a. Its angular speed. b. Its angular acceleration. c. Its centripetal acceleration. d. The magnitude of its total acceleration.