The sum of the three forces acting on the center point of the rope is assumed to be zero because:

a. This point has a very small mass.
b. Tension forces in a rope always cancel.
c. This point is not accelerating.
d. The angle of deflection is very small.

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

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Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?