Which term best describes the phrase "something that happens"?
A. Experiment
B. Observation
C. Hypothesis
D. Phenomenon

Which statement best describes how private industry decides where to spend the money on research and development

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

What happens when you slowly pulled the carboard?