The pressure exerted by a phonograph needle on a record is surprisingly large. If the equivalent of 1.10 g is supported by a needle, the tip of which is a circle 0.240 mm in radius, what pressure is exerted on the record in N/m2

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

conservation of mass

mass before something happens = mass afterwards

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.