Which statement about electric force is true? a) it is a purely attractive force. b) it is a purely repulsive force. c) it is both an attractive and a repulsive force. d) it is neither an attractive nor a repulsive force.

Agas expands from an initial volume of 0.040 m^3 and an initial pressure of 210 kpa to a final volume of 0.065 m^3 while its temperature is kept constant. how much work is done by the system?

We have a colorless transparent liquid. it looks like water. we seperated it into a solid and a liquid by evaporration and condention was this a chemichal or a physical seperation a. chemical seperation b. physical seperation

What is a possible result of higher air temperature caused by global warming