Conceptual Physics (12th Edition)
12th Edition
ISBN: 9780321909107
Author: Paul G. Hewitt
Publisher: PEARSON
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Chapter 2, Problem 65RCQ
For the pulley system shown, what is the upper limit of weight the strong man can lift.
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4) Suppose you use an ideal pulley of the type shown in image (a) in the figure below to support a car engine of mass 135 kg.
(a)
MA = 2
W
(b)
MA - 3
(a)
What would be the tension in newtons in the rope?
(c)
MA 4
(b)
What force in newtons must the ceiling supply, assuming you pull straight down on the rope? Neglect the pulley system's mass.
Two women lift an elephant 777kg weight with a crowbar when the fulcrum for this lever is 0.18m from the weight and the women exerts their strengths at 0.69m and 6.9m respectively from the fulcrum. If the women interchange positions, they can raise a 999 kg elephant. How much force does each women exert?
For the pulley system shown, what is the upper limit of weight the strong man can lift?
Chapter 2 Solutions
Conceptual Physics (12th Edition)
Ch. 2 - What class of motion, natural or violent, did...Ch. 2 - What state of motion did Aristotle attribute to...Ch. 2 - What relationship between the Sun and Earth did...Ch. 2 - What did Galileo discover in his legendary...Ch. 2 - What did Galileo discover about moving bodies and...Ch. 2 - Is inertia the reason for moving objects...Ch. 2 - How does Newton's first law of motion relate to...Ch. 2 - What type of path does a moving object follow in...Ch. 2 - What is the net force on a cart that is pulled to...Ch. 2 - Why do we say that force is a vector quantity?
Ch. 2 - According to the parallelogram rule, what quantity...Ch. 2 - What is the resultant of a pair of 1-pound forces...Ch. 2 - Consider Nellie hanging at rest in Figure 2.11. If...Ch. 2 - Can force be expressed in units of pounds and also...Ch. 2 - What is the net force on an object that is pulled...Ch. 2 - What is the net force on a bag pulled down by...Ch. 2 - What does it mean to say something is in...Ch. 2 - State the equilibrium rule for forces in symbolic...Ch. 2 - Consider a book that weighs 15 N at rest on a flat...Ch. 2 - When you stand at rest on a bathroom scale, how...Ch. 2 - A bowling ball at rest is in equilibrium. Is the...Ch. 2 - What is the net force on an object in either...Ch. 2 - If you push on a crate with a force of 100 N and...Ch. 2 - What concept was not understood in the 16th...Ch. 2 - A bird sitting in a tree is traveling at 30 km/s...Ch. 2 - Prob. 26RCQCh. 2 - Prob. 27RCQCh. 2 - Prob. 28RCQCh. 2 - 29. The sketch shows a painter’s scaffold in...Ch. 2 - 30. A different scaffold that weighs 400 N...Ch. 2 - 31. The weights of Burl, Paul, and the scaffold...Ch. 2 - 32. Rank the net forces on the blocks from least...Ch. 2 - Different materials, A, B, C, and D, rest on a...Ch. 2 - Prob. 34RCQCh. 2 - As seen from above, a stubborn stump is pulled by...Ch. 2 - Nellie hangs motionless by one hand from a...Ch. 2 - Prob. 37RCQCh. 2 - Prob. 38RCQCh. 2 - Prob. 39RCQCh. 2 - Prob. 40RCQCh. 2 - Prob. 41RCQCh. 2 - Prob. 42RCQCh. 2 - Prob. 43RCQCh. 2 - Prob. 44RCQCh. 2 - Prob. 45RCQCh. 2 - Prob. 46RCQCh. 2 - Prob. 47RCQCh. 2 - Prob. 48RCQCh. 2 - Prob. 49RCQCh. 2 - Prob. 50RCQCh. 2 - Prob. 51RCQCh. 2 - Prob. 52RCQCh. 2 - Prob. 53RCQCh. 2 - Prob. 54RCQCh. 2 - Prob. 55RCQCh. 2 - The rope supports a lantern that weighs 50 N. Is...Ch. 2 - Prob. 57RCQCh. 2 - The rope of Exercise is repositioned as shown as...Ch. 2 - Prob. 59RCQCh. 2 - Prob. 60RCQCh. 2 - Prob. 61RCQCh. 2 - Prob. 62RCQCh. 2 - Prob. 63RCQCh. 2 - Harry the painter swings year after year from his...Ch. 2 - For the pulley system shown, what is the upper...Ch. 2 - Prob. 66RCQCh. 2 - Prob. 67RCQCh. 2 - Prob. 68RCQCh. 2 - Prob. 69RCQCh. 2 - Prob. 70RCQCh. 2 - Prob. 71RCQCh. 2 - Prob. 72RCQCh. 2 - Prob. 73RCQCh. 2 - Prob. 74RCQCh. 2 - Prob. 75RCQCh. 2 - Prob. 76RCQCh. 2 - Prob. 77RCQCh. 2 - Prob. 78RCQCh. 2 - Prob. 79RCQCh. 2 - Prob. 80RCQCh. 2 - Prob. 81RCQCh. 2 - Prob. 82RCQCh. 2 - Prob. 83RCQCh. 2 - Prob. 84RCQCh. 2 - Prob. 85RCQCh. 2 - Prob. 86RCQCh. 2 - Prob. 87RCQCh. 2 - Prob. 88RCQCh. 2 - Prob. 89RCQCh. 2 - Prob. 90RCQCh. 2 - Prob. 91RCQCh. 2 - Prob. 92RCQ
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- A rope pulley system with 3 pulleys in the top and 2 in the bottom is required to lift a load. If 23% of the effort is lost due to friction, what is the maximum load that can be lifted if an effort of 300 N is applied. Also what is the force at the top while lifting this load.arrow_forwardWhat are informed about a particular force: "the force is inversely proportional to the cube of the distance." If the distance doubles, what happens to the force? Please see photo attached.arrow_forwardHow can the three bricks be stacked so that the top brick has maximum horizontal displacement from the bottom brick? For example, stacking them like the dotted lines suggest would be unstable and the bricks would topple. (Hint: Start with the top brick and work down. At every interface the CG of the bricks above must not extend beyond the end of the supporting brick.)arrow_forward
- A pulley system is rigged for a 4:1 advantage. If the system is 85% efficient, how much force is needed to pick up a 200-lbs box?arrow_forwardObjects A and B is connected by a cable that passes through a MASSLESS pulley as shown in the figure bellow. The mass of object A is ma and the mass of object B is mb.arrow_forwardIf you used an ideal pulley of the type shown in Figure shown(a) to support a car engine of mass 115 kg , (a) Whatwould be the tension in the rope? (b) What force must the ceiling supply, assuming you pull straight down on the rope? Neglect the pulley system’s mass.arrow_forward
- To get in shape, you head to the local gym to exercise by lifting weights. Using a lat machine as shown in the figure, you notice that the wire connected to the bar is run around three different pulleys and is connected to a vertical stack of weights on the other end. The weights move up as you pull down on the bar. Suppose you set the machine so that the weight to be lifted is 124.5 Ib. When you pull down on the bar, exerting a constant force, the acceleration experienced by the weights is 0.215 m/s?. What tension must exist in the wire connecting the bar and weights under these conditions? Assume the pulleys are massless and frictionless. N Pulley 1 Pulley 3 Pulley 2arrow_forwardTwo women lift an elephant 300 kg weight with a crowbar when the fulcrum for this lever is 0.6m from the weight and the women exerts their strengths at 0.8m and 2.5m respectively from the fulcrum. If the women interchange positions, they can raise a 350 kg elephant. How much force does each women exert?arrow_forwardWithin Hour. According to the figure, the force at T is 14 N. The pulleys are frictionless. Calculate the mass of A needed to maintain equilibrium.arrow_forward
- (a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) m = 68 kg CG Fre reaction 0.85 m 1.41 m N (b) How much work (in J) does she do if her center of mass rises 0.220 m? (c) What is her useful power output (in W) if she does 15 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.) Warrow_forwardThe effort required to balance the load in the figure is effort load 0.5 m 1.5 m 50 kg pivot 200 N .a O 1500 N .b 2000 N .c O 150 N .d Oarrow_forward(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) m = 47 kg CG Fe reaction 0.85 m 1.42 m N (b) How much work (in J) does she do if her center of mass rises 0.220 m? (c) What is her useful power output (in W) if she does 24 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.)arrow_forward
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