Which of the following correctly describes the relationship between speed and velocity? A. Speed is the change in velocity over time; velocity is distance plus direction.
B. Speed is the change in distance over time; velocity is speed plus direction.
C. Speed is distance plus direction; velocity is speed plus time.
D. Speed is the change in acceleration; velocity is distance over time.

An object is 10 cm from the mirror, its height is 1 cm and the focal length is 5 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1 -1 +10 -10

Which of the following is not am example of a polymer? protein nylon kevlar concreta

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.