As a 70-kg person stands at the seashore gazing at the tides (which are caused by the moon),
how large is the gravitational force on that person due to the moon? the mass of the moon is
7.35 x 1022 kg, the distance to the moon is 3.82 * 108 m, and g = 6.67 x 10-11 nm2/kg2.

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

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?

An electron is trapped at a defect in a crystal. the defect may be modeled as a one-dimensional, rigid-walled box of width 1.00 nm. (a) sketch the wavefunctions and probability densities for the n 1 and n 2 states. (b) for the n 1 state, nd the probability of nding the electron between x1 0.15 nm and x2 0.35 nm, where x 0 is the left side of the box. (c) repeat (b) for the n 2 state. (d) calculate the energies in electron volts of the n 1 and n 2 states