A person is sitting on a sled and someone is about to push them down a hill. Which statement is accurate?
1: Forces acting on the sled are paired with unequal and opposite forces.
2: Forces acting on the sled are paired with the force of gravity only.
3: Forces acting on the sled are paired with equal and opposite forces.
4: Forces acting on the sled are paired with the force of friction only.

In positive numbers less than 1, the zeros between the decimal point and non zero are significant

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

Aparticle of mass m is placed in a one-dimensional box of length l. the box is so small that the particle’s motion is relativistic, so that e p2/2m is not valid. (a) derive an expression for the energy levels of the particle using the relativistic energy–momentum relation and the quantization of momentum that derives from connement. (b) if the particle is an electron in a box of length l 1.00 1012 m, nd its lowest possible kinetic energy. by what percent is the nonrelativistic formula for the energy in error?