3. An engine shop uses a lift to raise a 1784 N engine. The lift has a large piston with an area of 76.32 cm. To raise the lift, force is exerted on a small piston
Frith an area of 12.56 cm. What force must be ererted to raise the lift?

Find a parametrization for the curve「and determine the work done on a particle moving along γ in r3 through the force field f: r^3--r^3'where f(x, y,z) = (1,-x, z) and (a) im (γ) is the line segment from (0,0,0) to (1,2,1) (b) im (γ) is the polygonal curve with successive vertices (1,0,0), (0,1,1), and (2,2,2) (c) im (γ) is the unit circle in the plane z = 1 with center (0,0,1) beginning and ending at (1,0,1), and starting towards (0,1,1)