What is the symbol for the element Actinium?
a. Ac
b. Tl
c. B
d. Md
e. He
a
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A point charge Q is placed on the x axis at the origin. An identical point charge is placed on the x axis at x = -1.0 m and another at x = +1.0 m. If Q = 40 mC, what is the magnitude of the electrostatic force on the charge at x = +1.0 m?
a. 29 N b. 14 N c. 11 N d. 18 N e. 7.0 N
What are the "rungs" of a DNA spiral made up of?
a. RNA b. four chemical bases arranged in pairs c. enzymes d. ribosomes e. proteins
Which of the following is a difference between low-mass stars and medium-mass stars?
A) Unlike medium-mass stars, low-mass stars can ignite hydrogen and helium. B) Unlike medium-mass stars, low-mass stars develop an inert helium core surrounded by unprocessed hydrogen. C) Unlike medium-mass stars, low-mass stars are not completely convective. D) Unlike medium-mass stars, low-mass stars cannot become giant stars.
It takes ________ years for the sun to progress through one sunspot cycle from a maximum area covered with sunspots, to a minimum, and back to a maximum. Refer to the graph above
A) about 1 year B) about 110 years C) about 10 years D) This figure cannot be used to answer this question.