Concept explainers
Why is the following situation impossible? A worker in a factory pulls a cabinet across the floor using a rope as shown in Figure P12.36a. The rope make an angle θ = 37.0° with the floor and is tied h1 = 10.0 cm from the bottom of the cabinet. The uniform rectangular cabinet has height ℓ = 100 cm and width w = 60.0 cm, and it weighs 400 N. The cabinet slides with constant speed when a force F = 300 N is applied through the rope. The worker tires of walking backward. He fastens the rope to a point on the cabinet h2 = 65.0 cm off the floor and lays the rope over his shoulder so that he can walk forward and pull as shown in Figure P12.36b. In this way, the rope again makes an angle of θ = 37.0° with the horizontal and again has a tension of 300 N. Using this technique, the worker is able to slide the cabinet over a long distance on the floor without tiring.
Figure P12.36 Problems 36 and 44.
Want to see the full answer?
Check out a sample textbook solutionChapter 12 Solutions
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
- A rigid vertical rod of mass 75 kg and length 4.0 m is connected to the floor by a bolt through its lower end A. The rod also has a wire connected between its top end B and the floor as shown in the figure. A horizontal force F = 500 N is applied at the midpoint of the rod. What is the tension in the wire?arrow_forwardMp= L. d ms A horizontal L=1.3 m long mb=15 kg uniform bar is hinged on the left end and pulled at the right end by a cable. The cable makes 29° angle with horizontal. A 18 kg store sign is suspended below the bar at d=0.18 m from the right end. Find the magnitude of tension.arrow_forwardA ladder of lengtharrow_forward
- Children playing pirates have suspended a uniform wooden plank with mass M = 14.8 kg, length l = 2.40 m, and angle 0 = 35.0°, as shown in the figure. What is the tension in each of the three ropes when Sophia, with a mass of m = 21.6 kg, is made to "walk the plank" and is d = 1.5 m from reaching the end of the plank? F3 = F2 N F1 35.0° I| ||arrow_forwardA uniform ladder 6.9 m long weighing 430 N rests with one end on the ground and the other end against a perfectly smooth vertical wall. The ladder rises at 59.5 o above the horizontal floor. A 800 N painter finds that she can climb 2.65 m up the ladder, measured along its length, before it begins to slip. Normal force exerted on ladder = 1230N Part A: What force does the wall exert on the ladder? F=____N Part B: Find the friction force that the floor exerts on the ladder. F=____Narrow_forwardThe experiment you did in lab is repeated, using a uniform metal bar that is 80.0 cm long instead of the meterstick. Since the bar is uniform, its center of gravity is at its center. The new experiment uses different hooks for hanging the masses from the bar, with mhook 5.0 g. As in the experiment you did in lab, X1 = 5.00 cm, m1 300.0 g, and Xp = 25.0 cm. In the 1 new experiment, you make the same measurements as in your lab and plot x versus The line that is the best fit to your data has slope 3800 cm · g. What is the mass of m2 + mhook the bar?arrow_forward
- A 725N person stands a distance d = 0.675 m from the left end of a plank. The plank is supported by 3 wires. Assume the plank is uniform, with length L = 2.00 m and mass 31.5 kg. What is the tension T, on the rope? 40.0° T 2.00 m O 621 N O 491 N O 549 N O 668 N O 420 N commandarrow_forwardIn the figure, a uniform beam of length 13.5 m is supported by a horizontal cable and a hinge at angle θ = 54.8°. The tension in the cable is 423 N. What are (a) the x-component and (b) the y-component of the gravitational force on the beam? What are (c) the x-component and (d) the y-component of the force on the beam from the hinge?arrow_forwardAs shown below, a beam of length L is in equilibrium and is attached to a cable which is pulling it against a frictionless wall. The beam is not attached to the wall and the wall is only exerting a normal force on the beam. Additionally, there is a 702 N box hanging on a wire from the end of the beam. Determine the cable tension & the beam weight. 0.89 L 45° tension = beam weight = 702 Narrow_forward
- The cable AB prevents bar OA from rotating clockwise about the pivot O. If the cable tension is 680 N, determine the n- and t- components of this force acting on point A of the bar. 4 1.7 m 62° 1.2 m B Answers: Tn= i T₁ = i N Narrow_forwardScientists have studied how snakes grip and climb ropes. In one study, they found that an important characteristic of a rope is its “compliance”— that is, how easily the rope, while under tension, can be flexed. As shown how scientists measured a rope’s compliance by attaching it to two strings, each supporting an identical mass m. The strings contort the rope so that its middle section lies at angle θ. For θ = 30° and m = 100 g, what are the tensions T1 and T2 in the upper and middle parts of the rope?arrow_forwardIf each cable can withstand a maximum tension of 1000 N, determine the largest mass o the cylinder for equilibrium. Solution: m = 90.3 kg B C 3 m 2 m 2 m 1 m 1m A 3 m D 4 m 1.5 marrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning