What will happen to the litmus strips?

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Can someone me with 3 and 4 plz. this is for masteries test.

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.