2points
identify the characteristic of gravity that is incorrect.
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a. it makes astronauts weightless.
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b. it keeps us from floating into outer space.
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c. it holds things together.
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d. the acceleration is constant near the surface of the earth.
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An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?