Concept explainers
You’ve been hired by your state’s environmental agency to monitor carbon dioxide levels just above rivers, with the goal of understanding whether river water acts as a source or sink of CO2. You’ve constructed the apparatus shown in Fig. 12.38, consisting of a boom mounted on a pivot, a vertical support, and a rope with pulley for raising and lowering the boom so its end can extend different distances over the river. In addition, there's a separate rope and pulley for dropping the sampling apparatus so it’s just above the river.
FIGURE 12.38 Passage Problem 64–67
If you pull the boom rope with constant speed, the angle the boom makes with the horizontal will
- a. increase at a constant rate.
- b. increase at an increasing rate.
- c. increase at a decreasing rate.
- d. decrease.
Want to see the full answer?
Check out a sample textbook solutionChapter 12 Solutions
Essential University Physics (3rd Edition)
Additional Science Textbook Solutions
Introduction to Electrodynamics
Essential University Physics: Volume 1 (3rd Edition)
College Physics: A Strategic Approach (4th Edition)
Conceptual Physics (12th Edition)
Applied Physics (11th Edition)
Lecture- Tutorials for Introductory Astronomy
- Two men are carrying a ladder of length l by supporting it at its ends. The ladder is horizontal, and its center of gravity is 1/4 of the way from one end. At what distance x from this end must a can of paint, of mass 3/4 of that of the ladder, be suspended so that the men carry equal loads?arrow_forwardA uniform L = 6.71 m long horizontal beam that weighs WB= 363N is attached to a wall by a pin connection that allows the beam to rotate. Its far end is supported by a cablewith tension Tthat makes an angle of 50.0° with the horizontal, and a person of weight WP= 427.5N is standing d = 2.38m from the pin. Find the magnitude of the force R exertedon the beam by the wall if the beam is in equilibrium. A)532N B)534N C)536N D)538Narrow_forwardA sign is supported by a uniform horizontal boom of length 3.10 m and weight 72.0 N. A cable, inclined at an angle of 16 °with the boom, is attached at a distance of 2.71 m from the hinge at the wall. The weight of the sign is 108.0 N. What is the tension in the cable and what are the horizontal and vertical forces Fx and Fy exerted on the boom by the hinge? Comment on the magnitude of Fy. T= In N Fx= in N Fy= in N The magnitude of Fy is select (small or large) compared to that of Fx and T.arrow_forward
- The system in the figure is in equilibrium. A concrete block of mass 313 kg hangs from the end of the uniform strut of mass 45.0 kg. For angles φ = 23.7° and θ = 66.6°, find (a) the tension T in the cable and the (b) horizontal and (c) vertical components of the force on the strut from the hinge.arrow_forwardA 183.6 kg uniform, horizontal beam is hinged at one end and at the other is supported by a cable that is at 28 degrees to the vertical. The beam is 2.75 m long. Calculate the magnitude of the force (in N) at the hinge .arrow_forwardOne end of a uniform rod of weight w = 73.5 N and length L = 2.55 m is supported by a cable at an angle of ? = 37.0°above the rod. The other end rests on a small frictionless support and presses into a wall as shown in the figure. Determine the magnitude n of the vertical normal force exerted by the support on the rod and find the magnitude T of the tension in the cable.arrow_forward
- A uniform platform with mass M=30kg and length L=15m is placed on two supports as shown. The distance between the supports is a=6m and F=340N is applied as shown with distance b=4m. The system is in static equilibrium. a) Find Normal force FN1 in Newtons. b) Find Normal force FN2 in Newtons.arrow_forwardTweedledum and Tweedledee are carrying a uniform wooden board that is L = 3.00 m long and has a weight of www = 160 N. If Tweedledum applies an upward force of magnitude F1 = 60.0 N at the left end of the board, at what point and with what magnitude F2 of force does Tweedledee have to lift for the board to be carried? a) see attached picture for questionarrow_forwardThe drawing shows a uniform horizontal beam attached to a vertical wall by a frictionless hinge and supported from below at an angle θ = 45o by a brace that is attached to a pin. The beam has a weight of 346 N. Three additional forces keep the beam in equilibrium. The brace applies a force P¯ to the right end of the beam that is directed upward at the angle θ with respect to the horizontal. The hinge applies a force to the left end of the beam that has a horizontal component H¯ and a vertical component V¯. Find the magnitudes of these three forces.arrow_forward
- A uniform pole 20 feet long and weighing 80 lbs is supported by a boy 2 feet from end A and a man 5 feet from end B. At what point should a load of 100 lbs be placed so that the man will i support twice as much as the boy? Include fb, formula and givenarrow_forwardA stepladder of negligible weight is constructed as shown in Figure P12.40, with AC = BC = = 4.00 m. A painter of mass m = 70.0 kg stands on the ladder d = 3.00 m from the bottom. Assuming the floor is frictionless, find (a) the tension in the horizontal bar DE connecting the two halves of the ladder, (b) the normal forces at A and B, and (c) the components of the reaction force at the single hinge C that the left half of the ladder exerts on the right half. Suggestion: Treat the ladder as a single object, but also treat each half of the ladder separately. Figure P12.40 Problems 40 and 41.arrow_forwardA stepladder of negligible weight is constructed as shown in Figure P10.73, with AC = BC = = 4.00 m. A painter of mass m = 70.0 kg stands on the ladder d = 3.00 m from the bottom. Assuming the floor is frictionless, find (a) the tension in the horizontal bar DE connecting the two halves of the ladder, (b) the normal forces at A and B, and (c) the components of the reaction force at the single hinge C that the left half of the ladder exerts on the right half. Suggestion: Treat the ladder as a single object, but also treat each half of the ladder separately.arrow_forward
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning