1.The radius and length of a steel cylinder are 60mm and 120 mm , respectively. If the mass of density of steel is 7850 Kg/m^3, determine the weight of the cylinder in pounds?
2.When a force F acts on a linear spring, the elongation x of the spring is given by F=kx, where K is called the stiffness of the spring. Determine the dimension of K in terms of the base dimensions of an absolute system of units ?
3.Two identical spheres of radius 8 in . and weighing 2 lb on the surface of the earth are placed in contact. find the gravitational attraction between them .