What is true about the structure of function of the plasma membrane? A. it is made entirely of integral proteins.
B. the processes endocytosis and exocytosis occur hear.
C. hydrophilic molecules attract the water the cell requires.
D. the double layer prevents anything from entering the cells.

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

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.

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?