2.1 Replace the force system acting on the beam by an equivalent force and couple moment at point A. 1120 N 2240 N 2.5 kN 1.5 kN 30° Figure 2-25(ⒸRussell C. Hibbler) 3m 3000 N 4 m 2.2 The Howe roof truss shown in Figure shown below carries the given loads. The wind loads are perpendicular to the inclined members. Determine the magnitude of the resultant, its inclination with the horizontal, and where it intersects AB. 1120 N 3 m 3 m 2000 N 2 m 3m Figure 2-26(©Mathalino.com) 3 kN 1000 N 2000 N 0 B 8 3 m B

2.1 Replace the force system acting on the beam by an equivalent force and couple moment at point A. 1120 N 2240 N 2.5 kN 1.5 kN 30° Figure 2-25(ⒸRussell C. Hibbler) 3m 3000 N 4 m 2.2 The Howe roof truss shown in Figure shown below carries the given loads. The wind loads are perpendicular to the inclined members. Determine the magnitude of the resultant, its inclination with the horizontal, and where it intersects AB. 1120 N 3 m 3 m 2000 N 2 m 3m Figure 2-26(©Mathalino.com) 3 kN 1000 N 2000 N 0 B 8 3 m B

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter9: Statics And Torque

Section: Chapter Questions

Problem 7PE: Two children of mass 20.0 kg and 30.0 kg sit balanced on a seesaw with the pivot point located at...

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Two children of mass 20.0 kg and 30.0 kg sit balanced on a seesaw with the pivot point located at the center of the seesaw. If the children are separated by a distance of 3.00 m, at what distance from the pivot point is the small child sitting in order to maintain the balance?
The forearm shown below is positioned at an angle with respect to the upper arm , and a 5.0- kg mass is held in the hand. The total mass of the forearm and hand is 3.0 kg, and their center of mass is 15.0 cm from the elbow. (a) What is the magnitude of the force that the biceps muscle exerts on the forearm for =60 ? (b) What is the magnitude of the force on the elbow joint for the same angle? (c) How do these forces depend on the angle ?
a) What is the mechanical advantage of a wheelbarrow, such as the one in Figure 9.24, if the center of gravity of the wheelbarrow and its load has a perpendicular lever arm of 5.50 cm, while the hands have a perpendicular lever arm of 1.02 m? (b) What upward force should you exert to support the wheelbarrow and its load if their combined mass is 55.0 kg? (c) What force does the wheel exert on the ground? Figure 9.24 (a) In the case of the wheelbarrow, the output force or load is between the pivot and the input force. The pivot IS the wheel's axle. Here, the output force is greater than the input force. Thus, a wheelbarrow enables you to lift much heavier loads than you could with your body alone. (b) In the case of the shovel, the input force is between the pivot and the load, but the input lever arm is shorter than the output lever arm. The pivot is at the handle held by the right hand. Here, the output force (supporting the shovel's load) is less than the input force (from the hand nearest the load), because the Input is exerted closer to the pivot than is the output
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The tow truck’s front wheels will be lifted off the ground if the moment of the load Wabout the rear axle exceeds the moment of the 31000-N weight of the truck. Determine thelargest W that maybe safely applied.
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