A uniform, 255-N rod that is 2 m long carries a 225-N weight at its right end and an unknown weight toward the left end as shown in Figure 1. When W is placed 50 cm from the left end of the rod, the system just balances horizontally when the fulcrum is located 75 cm from the right end. a. Find W. b. If W is now moved 25 cm to the right, how far and in what direction must the

A uniform, 255-N rod that is 2 m long carries a 225-N weight at its right end and an unknown weight toward the left end as shown in Figure 1. When W is placed 50 cm from the left end of the rod, the system just balances horizontally when the fulcrum is located 75 cm from the right end. a. Find W. b. If W is now moved 25 cm to the right, how far and in what direction must the

Name: provide the following:1. given2. unknown3. equation4. solution5. answe
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Description: provide the following:1. given2. unknown3. equation4. solution5. answer *add diagram if applicable A uniform, 255-N rod that is 2 mlong carries a 225-N weight at its right end andan unknown weight toward the left end asshown in Figure 1. When W is pl

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter8: Rotational Motion

Section: Chapter Questions

Problem 97A

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A uniform, 255-N rod that is 2 mlong carries a 225-N weight at its right end andan unknown weight toward the left end asshown in Figure 1. When W is placed 50 cm fromthe left end of the rod, the system just balanceshorizontally when the fulcrum is located 75 cmfrom the right end.a. Find W.b. If W is now moved 25 cm to the right,how far and in what direction must thefulcrum be moved to restore balance?
A uniform, 255-N rod that is 2 m long carries a 225-N weight at its right end and an unknown weight toward the left end. When W is placed 50 cm from the left end of the rod, the system just balance horizontally when the fulcrum is located 75 cm from the right end.a. Find W.b. If W is now moved 25 cm to the right, how far and in what direction must the fulcrum be moved to restore balance?
A strut of lengthL = 3.00 m and mass m =16.0 kg is held by a cableat an angle of θ = 30.0°with respect to the horizontalas shown in FigureP8.30. (a) Sketch a forcediagram, indicating allthe forces and their placementon the strut. (b) Why is the hinge a good place to usefor calculating torques? (c) Write the condition for rotationalequilibrium symbolically, calculating the torques around thehinge. (d) Use the torque equation to calculate the tension in the cable. (e) Write the x- and y-components of Newton’ssecond law for equilibrium. (f) Use the force equation tofind the x- and y -components of the force on the hinge.(g) Assuming the strut position is to remain the same, wouldit be advantageous to attach the cable higher up on the wall?Explain the benefit in terms of the force on the hinge andcable tension.
A uniform, 255-N rod that is 2.00m long carries a 225-N weight at its right end and an unknown weight W toward the left end. When W is placed 50.0cm from the left end of the rod, the system just balances horizontally when the fulcrum is located 75.0cm from theright end. (a) Find W.(b) If W is now moved 25.0cm to the right, how far and in what direction must the fulcrum bemoved to restore balance?
A weight of 6 N is located 11 cm from the fulcrum on the beam of a simple balance. What weight should be placed at a point 6 cm from the fulcrum on the opposite side in order to balance the system? N?
A painter climbs a ladder leaning against a smoothwall. At a certain height, the ladder is on the verge of slipping.(a) Explain why the force exerted by the vertical wall on theladder is horizontal. (b) If the ladder of length L leans at anangle u with the horizontal, what is the lever arm for this horizontalforce with the axis of rotation taken at the base of theladder? (c) If the ladder is uniform, what is the lever arm forthe force of gravity acting on the ladder? (d) Let the mass ofthe painter be 80 kg, L = 4.0 m, the ladder’s mass be 30 kg,θ = 53°, and the coefficient of friction between ground andladder be 0.45. Find the maximum distance the painter canclimb up the ladder.
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The body in the figure is pivoted at O. Three forces act on it in the directions shown: FA = 8.10 N at point A, 5.60 m from O; FB = 16.0 N at point B, 3.90 m from O; and FC = 18.0 N at point C, 3.50 m from O. Taking the clockwise direction to be negative, what is the net torque about O?
A uniform, 255 NN rod that is 1.80 mm long carries a 225 NN weight at its right end and an unknown weight WW toward the left end ). When WW is placed 60.0 cmcm from the left end of the rod, the system just balances horizontally when the fulcrum is located 75.0 cmcm from the right end. Find WW. Express your answer with the appropriate units. If WW is now moved 25.0 cmcm to the right, how far must the fulcrum be moved to restore balance? Express your answer with the appropriate units. If WW is now moved 25.0 cmcm to the right, in what direction must the fulcrum be moved to restore balance?
A doctor opens a 1.35 m wide door by pushing on it with a force of 37.5 N directed perpendicular to its surface. (a) What magnitude torque (in N · m) does she apply about an axis through the hinges if the force is applied at the center of the door? (b) What magnitude torque (in N · m) does she apply at the edge farthest from the hinges?
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