helicopter of mass 3000kg rises vertically at a constant speed of 25m/s if the acceleration due to gravity is10m/s2 ,determine the resultant force working on the helicopter

How would you measure the density of an irregular solid such as a glass stopper?

What is the effect on levels of liguid on a u-tube manometer when placed in a vacuum?

Give a reason why mass of a body is constant everywhere.

Draw the scales of a msg showing 2.86mm for a 50 divisions msg