COLLEGE PHYSICS
2nd Edition
ISBN: 9781711470832
Author: OpenStax
Publisher: XANEDU
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Chapter 9, Problem 24PE
To determine
(a)
The tension in the rope to support a car engine.
To determine
(b)
The force to be supplied by the ceiling.
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Trina is a gym goer with a leg length of 84 cm. Suppose that she is in the gym doing straight legraising with 10 lb weights.
Compute for the force that the muscle should exert in order to (1) maintain it in the position and(2) lift the weight up given that the distance of the effort (muscle) from the joint is 54 cm,distance of the weight is 80 cm, and the COM is 45 cm from the joint.
ANSWER THESE QUESTIONS:
1.) Compute for the force that will maintain the position.
2.) Compute for the force needed to lift the weight higher.
3.) Assuming that the hip flexion angle is at 60 degrees, compute for the lineardisplacement of the leg.
The 20kg flowerpot is supported at A by the three cords.(a) Determine the magnitude of the force acting in cord AB for equilibrium. (Express your answer using three significant figures and in N)(b) Determine the magnitude of force acting in cord AC for equilibrium. (Express your answer using three significant figures and in N)(c) Determine the magnitude of force acting in cord AD for equilibrium. (Express your answer using three significant figures and in N)
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hanging at the end of the beam. The beam is uniform, weighs 220 N, and is 9 m long; the
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maximum distance x that the bear can walk before the wire breaks?
60.0°
Goodies
Note: final answer with zero decimal place.
Chapter 9 Solutions
COLLEGE PHYSICS
Ch. 9 - What can you say about the velocity of a moving...Ch. 9 - Under what conditions can a rotating body be in...Ch. 9 - What three factors affect the torque created by a...Ch. 9 - A wrecking ball is being used to knock down a...Ch. 9 - Mechanics put a length of Pipe over the handle of...Ch. 9 - Prob. 6CQCh. 9 - Explain the need for tall towers on a suspension...Ch. 9 - When visiting some countries, you may see a person...Ch. 9 - Prob. 9CQCh. 9 - Prob. 10CQ
Ch. 9 - Why are the forces exerted on the outside world by...Ch. 9 - Explain why the forces in our joints are several...Ch. 9 - Why are the forces exerted on the outside world by...Ch. 9 - Explain why the forces in our joints are several...Ch. 9 - Certain of dinosaurs were bipedal (walked on two...Ch. 9 - Swimmers and athletes during competition need to...Ch. 9 - If the maximum force the biceps muscle can exert...Ch. 9 - Suppose the biceps muscle was attached through...Ch. 9 - Explain one of the reasons why pregnant women...Ch. 9 - (a) When opening a door, you push on it...Ch. 9 - When tightening a bolt, you push perpendicularly...Ch. 9 - Two children push on opposite sides of a door...Ch. 9 - Use the second condition for equilibrium (net =0 )...Ch. 9 - Repeat the seesaw problem in Example 9.1 with the...Ch. 9 - Prob. 6PECh. 9 - Two children of mass 20.0 kg and 30.0 kg sit...Ch. 9 - Prob. 8PECh. 9 - A person carries a plank of wood 2.00 m long with...Ch. 9 - Prob. 10PECh. 9 - Prob. 11PECh. 9 - Prob. 12PECh. 9 - Prob. 13PECh. 9 - Prob. 14PECh. 9 - Prob. 15PECh. 9 - Prob. 16PECh. 9 - To get up on the roof, a person (mass 70.0 kg)...Ch. 9 - Prob. 18PECh. 9 - Prob. 19PECh. 9 - Suppose you needed to raise a 250-kg mower a...Ch. 9 - Prob. 21PECh. 9 - Prob. 22PECh. 9 - Prob. 23PECh. 9 - Prob. 24PECh. 9 - Prob. 25PECh. 9 - Prob. 26PECh. 9 - Prob. 27PECh. 9 - Prob. 28PECh. 9 - Prob. 29PECh. 9 - Prob. 30PECh. 9 - Prob. 31PECh. 9 - Prob. 32PECh. 9 - Prob. 33PECh. 9 - Prob. 34PECh. 9 - Prob. 35PECh. 9 - Integrated Concepts Suppose we replace the 4.0-kg...Ch. 9 - Prob. 37PECh. 9 - You have just planted a sturdy 2-m-tall palm tree...Ch. 9 - Unreasonable Results Suppose two children are...Ch. 9 - Construct Your Own Problem Consider a method for...Ch. 9 - Prob. 1TPCh. 9 - Prob. 2TPCh. 9 - Prob. 3TPCh. 9 - Prob. 4TPCh. 9 - Prob. 5TPCh. 9 - Prob. 6TPCh. 9 - Prob. 7TPCh. 9 - Prob. 8TPCh. 9 - Prob. 9TPCh. 9 - Prob. 10TPCh. 9 - Prob. 11TP
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- he figure shows an outstretched arm (0.61 m in length) that is parallel to the floor. The arm is pulling downward against the ring attached to the pulley system, in order to hold the 98-N weight stationary. To pull the arm downward, the latissimus dorsi muscle applies the force M in the figure, at a point that is 0.069 m from the shoulder joint and oriented at an angle of 29°. The arm has a weight of 42 N and a center of gravity (cg) that is located 0.28 m from the shoulder joint. Find the magnitude of force M. Axis at houlder joint 29° M 0.28 m 0.069 m 0.61 m cg 98 Narrow_forwardA trapeze artist with swing weighs 800n; he is momentarily held to one side by his partner so that the swing ropes make an angle of 25.0 degrees with the vertical. In such a condition of static equilibrium, what is the horizontal force being applied by the partner?arrow_forwardAn athlete strengthens her leg and knee by doing "leg curls." While sitting on a bench with the leg initially bent at the knee, she supports a weight with the foot. She then slowly raises the foot and lower leg, with the upper leg held stationary. Find the tension in the quadriceps tendon for the position shown in the figure below. (Let w = 225 N, D = 44 cm and d = 5.5 cm.) please solve thank youarrow_forward
- An 800-N billboard worker stands on a 4.0-m scaffold weighing 500 N and supported by vertical ropes at each end. How far would the worker stand from one of the supporting ropes to produce a tension of 550 N in that rope? A 2.5 m B 1.4 m © 2.7 m 2.0 marrow_forwardAn exhaust system for a pickup truck is shown in the figure. The weights Wh, Wm, and W; of the head-pipe, muffler, and tailpipe are 9, 86, and 41 N, respectively, and act at the indicated points. If the exhaust-pipe hanger at point A is adjusted so that its tensions Fa is 62 N, determine the required forces in the hangers at points B, C, and D so that the force-couple system at point O is zero. Why is a zero force-couple system at O desirable? Fc FD FA FB 22° 22° c D B WmY r = 0,40 WAY F1.4-1.2 -0.50 0.50-0.40.3- Dimensions in meters Answers: FR = Fc = Fo Narrow_forwardWe analyzed the biceps muscle example with the angle between forearm and upper arm set at 90 degree (see figure below). Find the force exerted by the biceps muscle when the angle is 100 degree and the forearm is in a downward position. (Assume that r_1 = 5.0 cm, r_2 = 18cm, r_3 = 36 cm, m_a = 2.0 kg, and m_b = 3.0kg. Enter the magnitude.) Narrow_forward
- A construction crew would like to support a 1000 kg steel beam with two angled ropes as shown. Their rope can support a maximum tension of 5600 N. Is this rope strong enough to do the job?arrow_forwardA 60lb child and a 150lb adult are each holding 30lb weights and balancing on a seesaw. (a) If the child sits 6 feet from the pivot point, how far from the pivot point must the adult sit? (b) Next both drop their 30lb weights. If the child stays 6 feet from the pivot point how far from the pivot point, must the adult sit now?arrow_forwardThe arm shown in the figure 5. supports a 4kg sphere. The mass of the hand and forearmtogether is 3kg and its weight acts at a point 15 cm from the elbow. Determine the forceexerted by the biceps muscle.arrow_forward
- An athlete strengthens her leg and knee by doing "leg curls." While sitting on a bench with the leg initially bent at the knee, she supports a weight with the foot. She then slowly raises the foot and lower leg, with the upper leg held stationary. Find the tension in the quadriceps tendon for the position shown in the figure below. (Let w = 236 N,D = 44 cm and d = 5.5 cm.)arrow_forwardThe figure below shows an outstretched arm (0.61 m in length) that is parallel to the floor. The arm is pulling downward against the ring attached to the pulley system, in order to hold the 98 N weight stationary. To pull the arm downward, the latissimus dorsi muscle applies the force M in the figure, at a point that is 0.069 m from the should joint and oriented at an angle of 29°. The arm has a weight of 47 N and a center of gravity (cg) that is located 0.28 m from the shoulder joint. 0.61 m 0.28 m 0.069 m Axis at 98 N shoulder joint cg 29 Aldentify all the forces on the arm and draw an accurate and complete free body diagram on both the arm and the 98 N weight. You may draw on the figure if you wish. B Write down the correct equation of motion ON THE 98 N WEIGHT by summing all the forces acting on it using Newton's 2nd Law of Motion. You must identify and draw your chosen coordinate system. ( Write down the correct equation of motion ON THE ARM by summing all the forces acting on it…arrow_forwardAn individual leans forwards to pick up a box of 100 N. The weight of his upper body has a magnitude of 450 N. The back is pivoting around the base of the vertebral column. Consider the back of the individual as a rigid bar that is controlled by a muscle with an angle of 12° (See picture, d = trunk-head distance = 1 m).a) Calculate the magnitude of muscle force required to lift the box.b) Calculate the magnitude of the force at the base of the vertebral column. Hints: For (a) solve the equilibrium of moments, i.e. what force is required in the muscle to balance out the moments acting around the base of the spine.For (b), solve the equilibrium of forces acting on the spine, including the muscle force you’ve just calculated, in x and y separately. There are two extra forces not shown in the diagram: x and y contact forces acting at the base of the spine. These are whatever is needed to keep the total forces acting on the spine = 0 (so the spine isn’t accelerating off in some…arrow_forward
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