A ladder at rest is leaning against a wall at an angleas shown below.   Which of the following forces must have the same magnitude as the frictional force exerted on the ladder by the floor?  a The force of gravity on the ladder  b The normal force exerted on the ladder by the wall  c The normal force exerted on the ladder by the floor  d The frictional force exerted on the ladder by the wall

A 14.0 m uniform ladder weighing 480 N rests against a frictionless wall. The ladder makes a 59.0⁰-angle with the horizontal. (a) Find the horizontal and vertical forces (in N) the ground exerts on the base of the ladder when an 850-N firefighter has climbed 3.90 m along the ladder from the bottom. horizontal force magnitude direction vertical force ---Select--- N magnitude direction |---Select--- ✓ (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? N m (c) What If? 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?

An 82-kg diver stands at the edge of a light 5.0-m diving board, which is supported by two vertical pillars that are 1.6 m apart, as shown in the figure. 1.6 m 5.0 m A B Find the magnitude and direction of the force exerted by each pillar. Force on A KN Force on B kN (upward or downward?) (upward or downward?)

QUESTION 9 A diver of mass 69.8 kg stands on one end of a diving board of mass 24.8 kg, as shown in the diagram. Everything is in equilibrium (since nothing is moving). What is the magnitude of the support force on the opposite end of the diving board?   A 1,193 N   B 2,237 N   C 716 N   D 1,491 N

A diver of mass 62.0 kg stands on one end of a diving board of mass 27.9 kg, as shown in the diagram. Everything is in equilibrium (since nothing is moving). What is the magnitude of the support force on the opposite end of the diving board?     757 N     1,353 N     1,082 N     1,624 N

A horizontal 4.0 m long 10 kg uniform bar at one end is attached to a wall by a frictionless hinge and at the other end is held up by a cable that is 45 ° to the horizontal. i) What is the tension of the cable?   ii)What is the magnitude of the horizontal component of the force on the bar due to the hinge?

You wish to help the child carry the backpack. Find the magnitude of force you should apply to the backpack with weight 34 lb and the angle to minimize the amount of force the child needs to provide if a is fixed at 20.1°. B = Child B W y α O You X

a meter log is a uniform bar of mass m = 77 kg. You want to support it at a rest parallel to the ground. so you place it on a triangle support at 33 cm mark and tie it with a rope on the ground at the 28 cm mark. A) draw your own configuration out. calculate the tension of the rope ____ N, downward, upward, right, left, or none  and support force provided by the triangle support _______ N, downward, upward, right, left, or none    b) suppose a gumdrop (point mass mb = 14.00 kg) hangs on to the meter log at the 91 cm mark How large will the tension be on the rope? ______ N conceptually explain why it should increase, decrease, or stay the same, compared to part A.    C) Now with everything including the gumdrop, the triangle support has been moved away from the rope, to the end of the meter log.Explain why the system itself cannot stay balanced anymore, and the rope goes (T→0).  Calculate: rotational inertia of the system below. I = _______ kg·m2Calculate the sizes (+ only) of both the…

a meter log is a uniform bar of mass m = 77 kg. You want to support it at a rest parallel to the ground. so you place it on a triangle support at 33 cm mark and tie it with a rope on the ground at the 28 cm mark. A) draw your own configuration out. calculate the tension of the rope ____ N, downward, upward, right, left, or none  and support force provided by the triangle support _______ N, downward, upward, right, left, or none    b) suppose a gumdrop (point mass mb = 14.00 kg) hangs on to the meter log at the 91 cm mark How large will the tension be on the rope? ______ N conceptually explain why it should increase, decrease, or stay the same, compared to part A.    C) Now with everything including the gumdrop, the triangle support has been moved away from the rope, to the end of the meter log.Explain why the system itself cannot stay balanced anymore, and the rope goes (T→0).  Calculate: rotational inertia of the system below. I = _______ kg·m2Calculate the sizes (+ only) of both the…