3. A 5.0 m long stationary ladder leans up against a smooth vertical wall. The top of the ladder leaning against the wall is 4.0 m above the ground (not smooth). The bottom of the ladder is 3.0 m away from the base of the wall. The mass of the ladder is 45 kg. Find the following; a) The force of the wall on the ladder. b) The magnitude of the force of the ground on the ladder. c) The minimum coefficient of static friction required to keep the ladder stationary in this position.

B1

A 4 m long horizontal uniform beam of mass 20 kg is supported by a wire as shown in the figure. The wire makes an angle of 23 degrees with the beam. Attached to the beam 1.2 m from the wall is a ball with a mass of 48 kg. What is the tension in the string? K 0 (m)

A 14.0 m uniform ladder weighing 510 N rests against a frictionless wall. The ladder makes a 59.0°-angle with the horizontal. A. Find the horizontal and vertical forces (in N) the ground exerts on the base of the ladder when an 810-N firefighter has climbed 4.10 m along the ladder from the bottom. B. If the ladder is just on the verge of slipping when the firefighter is 9.40 m from the bottom, what is the coefficient of static friction between ladder and ground? C. If oil is spilled on the ground, causing the coefficient of static friction to drop to half the value found in part (b), what is the maximum distance (in m) the firefighter can climb along the ladder from the bottom before the ladder slips?