A balloon containing helium gas expands from 230 ml to 860 ml as more helium is added. What was the initial quantity of helium present if the expanded balloon contains 3.8 × 10-4 mol

Which of the following changes to a pipe would increase the conductance by a factor of 12? 1.quadrupling the length and tripling the radius.2.reducing the length by a factor of and doubling the radius.3.tripling the length and reducing the radius by a factor of .4.reducing the length but a factor of and doubling the radius.

Avehicle has an oil leak that is causing the entire oil pan to be wet, but inspection reveals no exact source after cleaning off the oil residue. technician a says to install a fluorescent dye in the crankcase and operate the engine, then re-inspect for leaks with a special light (black light). technician b says the oil leak may be coming from a source at the top of the engine, such as a valve cover gasket. who is correct?

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?