Which statement is true because of Newton's second law? Group of answer choices

You have to push a full shopping cart with more force than an empty shopping cart.

A soccer ball will not move until someone kicks it.

For every action there is an equal and opposite reaction.

A skateboarder travels at a constant speed when there are balanced forces acting on him.

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.

Two people each hold the end of a rope and create waves by moving their arms up and down. this wave is best classified as a transverse wave because a) both the rope particles and the wave are moving in the same direction. b) the wave is moving up and down as the particles of the rope move horizontally. c) the wave is moving horizontally as the particles of the rope move up and down. eliminate d) the wave is moving in a parallel direction with the motion of the person's arms.