The rocket sled shown below decelerates at a rate of 196m/s2. What force is necessary to produce this deceleration? Assume that the rockets
are off. The mass of the system is 2.10x10^3 kg.

What produces light and all other electromagnetic waves? a) the photoelectric phenomena b) heated metals c) charged particles d) radioactive samples (pls explain if you can : )

An element becomes a positively charged ion when itloses protons.loses electrons.gains electrons.gains neutrons.

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?