A 0.305 kg book rests at an angle against one side of a bookshelf. The magnitude and direction of the total force exerted on the book by the left side of the bookshelf are givby um = 1.95N 9._ = 35.0 What must the magnitude IFBI and direction 93 of the total force exerted on the book by the bottom of the bookshelf be in order for the book to remain in this position? A homeowner is trying to move a stubborn rock from his yard. By using a a metal rod as a lever arm and a fulcrum (or pivot point) the homeowner will have a better chance of moving the rock. The homeowner places the fulcrum a distance d = 0.222 m from the rock, which has a mass of 365 kg. and ts one end of the rod under the rock's center of weight. ~.' i-d-"' If the homeowner can apply a maximum force of 655 N at the other end of the rod. what is the minimum total length L of the rod required to move the rock? Assume that the rod is massless and nearly horizontal so that the weight of the rock and homeowner's force are both essentially vertical The acceleration due to gravity is g = 9.81 III/s2. 3. The meterstick shown is 100 cm long. It is free to pivot around its center of gravity (CG). which is at the 50 cm mark There is a 24.0 N block hanging from the 80 cm mark. Decide where each of the other blocks should be placed. one at a lime, to balance out the 24.0 N block. I At what mark on the meter stick would you place a 18.0 N block to balance the 24.0 N black? mark: cm At what mark on the meter suck would you place a 40.0 N block to balance the 24.0 N block? .... E c. 4. The bones of the forearm (radius and ulna) are hinged to the humerus at the elbow. The biceps muscle connects to the bones of the forearm about 2.l5 cm beyond the joint. Assume the forearm has a mass of 2.75 kg and a length of 0.425 111. When the humerus and the biceps are nearly vertical and the forearm is horizontal. if a person wishes to hold an object of mass 6.95 kg so that her forearm remains motionless. what is the force F exerted by the biceps muscle