In order for work to be done, what three things are necessary?
select one:

a. power, a force, and movement in the opposite direction of the applied force

b. balanced forces, motion, and distance covered over time

c. unbalanced force, motion in the same direction as the applied force, and power

d. unbalanced force, motion, and movement in the same direction of the applied force

Arescue plane flying horizontally at spots a survivor in the ocean directly below and releases an emergency kit with a parachute. because of the shape of the parachute, it experiences insignificant horizontal air resistance. if the kit descends with a constant vertical acceleration of, how far away from the survivor will it hit the waves?

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.