You want to test the effect rhat amount of light has on growing bean plants you have 20 plants and the ability to adjust the amount of light Hypothesis
Experiment
Control group
Experimental group
independent variable
Dependent variable

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90