Which statement describes a primary difference between an electromagnetic wave and a mechanical wave?
A. Electromagnetic waves need a medium to transfer energy.
B. Electromagnetic waves can only travel through solids, liquids, or
gases.
C. Electromagnetic waves can be transverse, longitudinal, or surface
waves.
D. Electromagnetic waves can travel through empty space.

Aboy with a mass 25 kg climbs into a small tree. he sits on a branch that is 2.o m above to the ground.what is his gravitational potential energy above the ground?

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).

Which of the following describes how a microwave heats food