the efficiency of a pulley system is 80% and the mechanical adventage is 4 answer the following question find the number of pulleys used in this system? in that pulley system how much effort or is needed to raise a load of 1600N​

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

Which is not true of the intertropical convergence zone? a) it features heavy precipitation b) it's where the trade winds collidec) it's a high-pressure zone with sinking air d) it is also known as the doldrums