Aswimmer bounces almost straight up from a diving board and falls vertically feet first into a pool. she starts with a speed of 4.8m/s, and her takeoff point is 1.95m above the pools surface. for how long are her feet in the air, in seconds?

What is the speed of an object at a given moment?

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.

Which symbol in the first law of thermodynamics represents the sum of the chemical and thermal energy stored in atoms and molecules? a. q b.w c.v d.u