In the figure, block A (mass 11.6 kg) is in equilibrium, but it would slip if block B (mass 7.10 kg) were any heavier. For angle 0 = 24.3°, what is the coefficient of static friction between block A and the surface below it? B Number i Units

Find the magnitude of tension in the two cords shown in the figure (Figure 1). Figure 0 m Ⓒ 1 of 1 Part A Neglect the mass of the cords, and assume that the angle is 36.0° and the mass m is 200 kg. What is the magnitude of the tension in the right cord (the horizontal one)? Use g = 9.81 m/s². Fin right cord Submit ▾ Part B What is the magnitude of the tension in the left cord? Fin left cord Submit for Part A for Part A undo for Part A redo for Part A reset for Part A keyboard shortcuts for Part A help for Part A Request Answer Provide Feedback for Part B for Part B undo for Part B redo for Part B reset for Part B keyboard shortcuts for Part B help for Part B Request Answer N Constants N Next >

Part B As shown, a truss is loaded by the forces P₁ = 497 lb and P₂ = 198 lb and has the dimension a = 9.40 ft. H M B с ** FCG, FGH = a/2 a/2 P₂ Determine FCG and FGH, the magnitudes of the forces in members CG and GH, respectively, using the method of sections. Assume for your calculations that each member is in tension, and include in your response the sign of each force that you obtain by applying this assumption. Express your answers numerically in pounds to three significant figures separated by a comma. ▸ View Available Hint(s) E 195] ΑΣΦΗ 41 | vec SWED ? lb

In the figure, block A (mass 13.2 kg) is in equilibrium, but it would slip if block B (mass 7.40 kg) were any heavier. For angle 0 = 29.6°, what is the coefficient of static friction between block A and the surface below it? Number i Units

XVI Board Pulled Out from under a Box A small box of mass mi is sitting on a board of mass m2 and length L (Figure 1). The board rests on a frictionless horizontal surface. The coefficient of static friction between Part A the board and the box is ls. The coefficient of kinetic friction between the board and the box is, as usual, less than ls. Find Fmin, the constant force with the least magnitude that must be applied to the board in order to pull the board out from under the the box (which will then fall off of the opposite end of the board). Throughout the problem, use g for the magnitude of the free-fall acceleration. In the hints, use f for the magnitude Express your answer in terms of some or all of the variables ls, m1, m2, g, and L. Do not include f in your answer. of the friction force between the board and the box. • View Available Hint(s) ? Fmin = Submit Provide Feedback Figure 1 of 1 L

A B Let's revisit a previous problem and add the force of friction. In the figure, block A has a mass of 2.67 kg. It rests on a smooth but not frictionless horizontal table and is connected by a very light horizontal string over an ideal pulley to block B, which has a mass of 3.28 kg. The coefficient of kinetic friction between block A and the table is 0.2. When block B is gently released from rest, how long does it take block B to travel 0.983 m? Note: Be careful! Be sure all quantities are expressed in standard units before calculating anything. Report your answer in seconds.

t The center of mass of the arm shown in the figure is at point A. Find the magnitudes (in N) of the tension force F, and the force F which hold the arm in equilibrium. (Let 8 = 24.0º.) Assume the weight of the arm is 44.7 N. S 0 8.00 cm N e N 29.0 cm. F

x Incorrect The force P is applied to the 30-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the surface on the block if (a) P = 0, (b) P = 85 N, and (c) P = 131 N. (d) What value of P is required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are us = 0.18 and µk = 0.12, respectively. The friction force is positive if up the incline, negative if down the incline. %3D P 30 kg 18° H, = 0.18 H = 0.12 12 Answers: (а) F 3D N (b) F (c) F = (d) P =

What is the terminal speed of a 7.11 kg spherical ball that has a radius of 1.69 cm and a drag coefficient of 1.38? The density of the air through which the ball falls is 1.20 kg/m³. Number i Units

AP A student, crazed by final exams, uses a force P of magnitude P and angle 0 to push a block of mass m across the ceiling of his room, as in the figure. If the coeffcient of kinetic friction between the block and the ceiling is µk, what is the magnitude of the block's acceleration? NOTE: Express your answer in terms of the given variables, and g. |ā|