Two electrons (e1 and e2) and a proton (p) lie on a straight line, as shown. The directions of the force of e2 on e1, the force of p on e1, and the total force on e1, respectively, are: ______e1________e2________p
A) ?, ?, ?
B) ?, ?, ?
C) ?, ?, ?
D) ?, ?, ?
E) ?, ?, ?
D) ?, ?, ?
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a. velocity c. speed b. average velocity d. displacement
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A sample of an ancient sedimentary rock contains slightly less of the isotope carbon-13 than found in inorganic material. One possible explanation for this is that
A) it was a meteorite that fell from the sky B) some kind of radioactive decay occurred in it in the past C) it used to be at the bottom of an ancient ocean D) some kind of biological activity occurred in it in the past