How would our society be affected if there was a shortage of copper?

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?