Questions

Money spent by the government on government programs such as road work, electricity work, manhole, etc... that are aiming to contribute to the nation's social welfare in long and short term are referred to as Goverment Expenditures.

Convex mirror is used as rear view mirror in vehicles. Because the image is smaller, more image can fit onto the mirror, so a convex mirror provides for a larger field of view than a plane mirror. This is why they are useful.

Centrifugal force is the fictitious force that pulls out from the center on the body we feel while moving in the circular path. It increases with the rate of rotation of the axis i.e, acceleration of the body.