A 20 kg metal
block is placed on horizontal surface. A block is just begin to slide when the
horizontal force of 100 N is applied to it. Calculate the coefficient of static
friction. If the coefficient of kinetic friction is 0.4, find the minimum force
to maintain its uniform motion.
Calculate the force required to take away
a flat circular plate of radius 0.01 m from the surface of water. The surface
tension of water is 0.075 N / m