A proton moving at 3 × 104 m/s is projected at an angle of 30° above a horizontal plane. If an electric field of 400 N/C is directed downwards, how long does it take the proton to return to the horizontal plane? (HINT: Ignore gravity.) [mProton = 1.67 × 10?27 kg, qProton = +1.6 × 10?19 C.]
What will be an ideal response?
7.8 × 10?7 s
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Scientific notation is used in science because
a. it makes it easy to write big or small numbers. b. all astronomical distances are expressed in metric units. c. it makes conversions between units easy. d. all of the above
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Which four moons are believed to have large bodies of liquid water?
What will be an ideal response?