In the controlled experiment, a scientist is studying how long it takes parachutes of different sizes to fall to the ground. what are the manipulated/experimental variables?

The size of the parachutes.

Explanation: In this experiment we have two variables: The size of the parachute and the time that the parachute needs to cover a given distance (from a plane to the ground, for example)

The only thing that the scientist can modify, the independent variable, is the size of the parachute, and this will impact in the dependent variable, the time it needs to fall to the ground.

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the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

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