A 200 kg cart accelerates when 20 N of force is applied. If the mass is doubled, how much force would there be if acceleration is same? Group of answer choices

10 N

20 N

40 N

No change

What is the difference between electrically neutral objects and electrically charged objects

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

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