A load of 80 kgf is raised using a block and tackle system of five pulleys by an effort of 18 kgf. What is the efficiency of the system? .
Elastic behaviour, Stress-strain relationship, Hooke's law, Young modulus, bulk modulus, shear, modulus of rigidity, Poisson's ratio; elastic energy. Pressure due to a fluid column; Pascal’s law and its applications (hydraulic lift and hydraulic brakes). Effect of gravity on fluid pressure.