A surveyor is trying to find the height of a hill he/she take a sight on the top of the hill and find that the angle of elavation is 45° he/she moves a distance 250 metres on the level ground directly away from t he hill and take a second sight from this point the angle of elevation is 20° find the height of hill

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?