Select the correct answer. Which two atoms are isotopes of each other?
O A. si and 25 mg
OB. Z. Mg and 7 AI
Oc 7, Mg and 23 Mg
OD. 73 Na and 22 Mg
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Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

If the textbook weighs 19.6 newtons on venus, what is the strength of gravity on venus?

You are driving to the grocery store at 20 m/s. you are 110m from an intersection when the traffic light turns red. assume that your reaction time is 0.50s and that your car brakes with constant acceleration. how far are you from the intersection when you begin to apply the brakes? what acceleration will bring you to rest right at the intersection? how long does it take you to stop after the light changes? the known values: vi=20m/s xi=110m t=.50s vf=0m/s xf=0m a=?