When a person runs, how is the energy transformed?
A. The chemical energy in their food is
transformed into mechanical and thermal
energy.
B. The mechanical energy in their food is
transformed into electromagnetic and
thermal energy.
C. The chemical energy in their food is
transformed into sound and thermal
energy.

Modify the equation fδt=δ (mv) to find the force of friction.

Animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. reactivate d) a dog is getting hot in the sunlight, so he moves to a shaded area.

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force