A capillary tube of length 2.4cm and internal diameter 0.2cm is weighed and its mass is found to be 0.15g. The tube is filled with mercury of density 13.5g/cm3 and weighed again. What will be the new mass of the filled tube?

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.