A14.0 kg iron mass rests on the bottom of a pool. (the density of iron is 7.86 ✕ 103 kg/m3 and the density of water is 1.00 ✕ 103 kg/m3.) hint (a) what is the volume of the iron (in m3)? m3 (b) what buoyant force acts on the iron (in n)? (enter the magnitude.) n (c) find the iron's weight (in n). (enter the magnitude.) n (d) what is the normal force acting on the iron (in n)? (enter the magnitude.) n

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c