A roller-coaster car has a mass of 1040 kg when fully loaded with passengers. As the car passes over the top of a circular hill of radius 24 m, its speed is not changing. (a) At the top of the hill, what is the normal force (using the negative sign for the downward direction) FN on the car from the track if the car's speed is v?

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !

Convection currents are caused by differences in what two things?