In refraction, when a wave travels from one medium to another, it
a. changes speeds.
b. stays in step.
c. always moves in the same direction.
d. travels in the opposite direction.

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

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).