In figure 4, a 600 N-block B rests on a table holding another block A through a rope. The mass of block A is 12 Kg and the rope hinged on the wall makes an angle 60 with horizontal. Determine the coefficient of static friction of the block B and the table. Knot

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

CEE 241: Statics University of Nevada, Las Vegas Image copyright © Pearson Education, Inc. Shared with current students using accompanying text by the instructor solely for the purpose of teaching the course and assessing student learning. You should not distribute this document to anyone. The coefficient of static friction at all contacting surfaces is μ. The blocks are identical and weigh W. Determine the angle at which the blocks begin to slide. Answer: 0 = tan=¹ (5μ) A B 0 I

Question 1) The system shown is in equilibrium. If the weight of the box is 1000 N, then find the magnitude of F₁ and 0. 600 N 30° 400 N X

5) A block of mass 0.40 kg is attached to the wire connected to the wall making an angle of 90 degrees with it. It is also attached to the ceiling with the wire making an angle of 53 degrees with the horizontal. Calculate tensions at each wire. (Tws the tension in the wire hinged to the wall and Te is the tension in the wire attached to the ceiling). t

Problem 4 The upper leg muscle (quadriceps) exerts a force of 1250 N, which is carried by a tendon over the kneecap (the patella) at the angles shown in the figure. Find the direction and magnitude of the force exerted by the kneecap on the femur. Fo = 1250 N 55° 75 Fo