3. Objects with masses of 0.2 kg and 0.3 kg are separated by 0.15 m. A third object of mass 0.05 kg is placed between them on the line joining the first two objects. a) Find the net gravitational attraction force exerted on the third object if it is placed 0.05 m from the 0.3 kg mass. [3.35x10-N]
b) At what position along the line the third object should be placed for no net gravitational force exerted it. [6.7 cm]​

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

snell's law

refractve index = sin incidence / sin refraction