Consider a small cannon ball with the weight of 5 kg is shot with an initial velocity of 120 m/s at an angle of 60° with respect to the ground. how high does the cannon ball go if the air resistance is proportional to velocity; fa = bv where b = 0.0075.

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?