When I look at the tyres of a moving vehicle in a movie the look as if they are moving in the opposite direction. How can we explain this phenomenon/effect?

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

An arrow of mass 20g traveling horizontally strikes a block of wood of mass 1980g resting on a horizontal surface. The impact takes 0.2s before the two move together with an initial velocity of 5m/s. Calculate: a. The velocity of the ...

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

the initial velocity of a body 20kg is 4m/s. how long would a constant force of 5N act on the body to double its kinetic energy

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