A van der waals gas undergoes an isothermal expansion from specific volume v1 to specific volume v2. 1) Calculate the change in the specific helmholtz function for this process.2) Calculate the change in the specific internal energy U for this process in terms of v1 and v2 using uqation F=U +T(partia F/ partia T)V.

Asher cycles 12 miles in 16 hours. what is his speed?

Agroup of monkeys is trying to cross the river in a rowboat. the maximum buoyant force on the rowboat is 2,000 n. the weight of the rowboat is 1,000 n. each monkey has a weight of 150 n. how many monkeys can safely cross in the rowboat at one time? explain your reasoning, including any calculations you used to find the answer.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.