A rock is dropped from the top of a 45-meter tower, and at the same time a ball is thrown from the top of thetower in a horizontal direction. Air resistance is negligible. The ball and the rock hit the level ground adistance of 30 meters apart. The horizontal velocity of the ball thrown was most nearly
(A) 5 m/s
(B) 10 m/s
(C) 14.1 m/s
(D) 20 m/s
(E) 28.3 m/s

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?

It is reasonable to assume that the bulk modulus of blood is about the same as that of water (2.2 gpa). as one goes deeper and deeper in the ocean, the pressure increases by 10000 pa for every meter below the surface. if a diver goes down 80.0 m in the ocean, by how much does each cubic centimeter of her blood change in volume? give the answer in cubic centimeters (actually one cubic centimeter equals one milliliter).