Two descriptions about physical quantities are given below: Quantity A: It has the same unit as force.
Quantity B: It measures the amount of matter in an object.

What quantities are these most likely describing?

Both Quantity A and Quantity B are mass.
Both Quantity A and Quantity B are forces.
Quantity A is weight and Quantity B is mass.
Quantity A is mass and Quantity B is weight.

What sort of waves exhibit the doppler effect?

You can watch static electricity in action by rubbing an inflated balloon against your hair. your hair will actually stand on its end! it does this because each hair becomes charged, and they all repel one another.

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.