Captain John Stapp of the U. S. Air Force tested the human limits of acceleration by riding on a rocket sled of his own design. His rocket sled, known as the Gee Whiz, had a mass of about 95 kg. What net force would be required to accelerate the
Gee Whiz and 82-kg Stapp at 450 m/s/s (a. k.a. m/s?) which is the highest acceleration tested by Stapp?

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

thermal energy is the answer