Ramita of 50kg mass climb a stair of 20 steps in 40s. If each step has 25cm height. Calculate the power [Ans:62.25w] Lesson 4 - Energy, work and power

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

photocells convert light energy to electricity

the maxium height is 34m/s

conservation of mass

mass before something happens = mass afterwards