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12 Nov 2019

A lunch tray is being held in one hand, as the figure illustrates.The mass of the tray itself is 0.200 kg, and its center of gravityis located at its geometrical center. On the tray is a 1.26-kgplate of food and a 0.210-kg cup of coffee. Obtain (a) the forceexerted by the thumb and (b) the force exerted by the four fingers.Both forces act perpendicular to the tray, which is being heldparallel to the ground.



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Patrina Schowalter
Patrina SchowalterLv2
15 Oct 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A lunch tray is being held in one hand, as the figure illustrates (I will explain). The mass of the tray itself is 0.214 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.20 kg plate of food and a 0.239 kg cup of coffee. Obtain (a) the force T exerted by the thumb and (b) the force F exerted by the four fingers. Both forces act perpendicular to the tray, which is being held parallel to the ground. The person's right hand is shown with the thumb on top and all other fingers on the bottom or the tray. A vertical line is drawn as where ALL the measurements are made to (with arrows pointing out to it) from the base of the thumb upward. The following values are labeled: from this line to horizontal distance over to the thumbnail = 0.0600m, from this line to index fingernail = 0.100m, from this line over to middle of plate = 0.240m, from this line over to middle of coffee cup = 0.380m, and from this line over to the other line way to the right which is at the right edge of the coffee cup AND end of tray = 0.400m. The force F is labeled pointing up from the index finger (and all other fingers are hiding behind it). The force T is labeled pointing down from the thumb.

A uniform disk of mass m = 3.6 kg and radius R = 8 cm can rotate about an axle through its center. Four forces are acting on it as shown in the figure.

Their magnitudes are F1 = 7.5 N, F2 = 4.5 N, F3 = 7.5 N and F4 = 4.5 N. F2 and F4 act a distance d = 4.5 cm from the center of mass. These forces are all in the plane of the disk.

Part (c) Write an expression for the x-component Px of the force exerted by the pivot in terms of T.

Part (d) What is the tension in the horizontal cable, in Newtons, if the mass of the beam is 38kg, the length of the beam is 13m and the angle is 37o?

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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