Plz help 1. How much force is needed to accelerate a 66kg skier at 2m/sec2

2. What is the force on a 1000kg elevator that is falling freely at 9.8 m/sec2

3. what is the acceleration of a 50kg object pushed with a force of 500 newtons?

Achemistry student weighs out of phosphoric acid , a triprotic acid, into a volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with solution. calculate the volume of solution the student will need to add to reach the final equivalence point. round your answer to significant digits.

Modern weaponry has increased the number of deaths in wars and violent conflicts.

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution