3 Torque A 16 cm, 10 g pencil, with mass evenly distributed along its length, is held horizontally at rest between a person's thumb and index finger as shown. The index finger touches the pencil 2 cm from its end and the thumb touches it 4 cm from the same end. Index Finger 2 cm 4 cm Thumb 10 g Problem 3.1. If the thumb and index finger exert vertical forces only, what is the magnitude and direction of each of these forces?

3 Torque A 16 cm, 10 g pencil, with mass evenly distributed along its length, is held horizontally at rest between a person's thumb and index finger as shown. The index finger touches the pencil 2 cm from its end and the thumb touches it 4 cm from the same end. Index Finger 2 cm 4 cm Thumb 10 g Problem 3.1. If the thumb and index finger exert vertical forces only, what is the magnitude and direction of each of these forces?

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter12: Static Equilibrium And Elasticity

Section: Chapter Questions

Problem 37P: To get up on the roof, a person (mass 70.0 kg) places 6.00-m aluminum ladder (mass 10.0 kg) against...

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To get up on the roof, a person (mass 70.0 kg) places 6.00-m aluminum ladder (mass 10.0 kg) against the house on a concrete pad with the base of ladder 2.00 m from the house. The ladder rests against a plastic rain gutter, which we can assume to frictionless. The center of ladder is 2.00 m from the bottom. The person is standing 3.00 m from the bottom. Find the normal reaction and friction forces on the ladder at its base.
The light right-angle boom which supports the 450-kg cylinder is supported by three cables and a ball-and-socket joint at O attached to the vertical x-y surface. Determine the reactions at O and the cable tensions. y 1.65 m! 1.70 m C 1.40 m E 1.40 m A 2.80 m 0.85 m B 0.85 m 450 kg Answers: Ox = i N Oy = i N O2 = i N TẠC = i N TBD = i N TBE = i N
A gymnast rises onto her toes, as shown in the picture on the right. The floor pushes up on the ball of her foot with a force of N=313 N. If 0=56.0°, what are FH the forces in her heel (TH) and ankle joint (T), and what is the angle o? Answers: TH=481 N; T,=761 N; b=20.7° N, 0. 4.25 cm 9.66 cm 5.
A worker is standing on a scaffold supported by a vertical rope at each end. The scaffold weighs 185N and is 3.35m long. What is the tension in the rope nearer the 717N worker when he stands 1.24m from one end? The acceleration of gravity is 9.8m/s?.
2. Barry carries his tray of food to his favorite cafeteria table for lunch. The 0.50 m long trayhas a mass of 0.20 kg and holds a 0.40 kg plate of food 0.20 m from the right edge.Barry holds the tray by the left edge with one hand, using his thumb as the fulcrum, andpushes up 0.10 m from the fulcrum with his finger tips.a. How much upward force must his finger tips exert to keep the tray level? b. How might Barry make the tray easier to carry if he chooses to use only one hand?
The forces F1, F2, ..., Fn acting at the same point P are said to be in equilibrium if the resultant force is zero, that is, if F1 + F2 + ··· + Fn = 0. F1 = 3, -6, F2 = 7, −2, F3 = -10, 8
Situation 3. The rope CE exerts a 500-N force T on the hinged door. (a) Express T in terms of components; (b) determine the magnitude of the component of T perpendicular to the door. (0, 0.2, 0) m T E D B (0.35, 0, 0.2) m (0.2, 0.4, -0.1) m A (0.5, 0, 0) m C -X 2 ft x
It is sometimes important to determine the location of a person’s center of gravity(which coincides with the center of mass because the gravitational force is uniform at the scale of the human body). This can be done with the arrangement shown intheFigure below. A light (negligible mass) plank rests on two scales that read Fg1=380 N and Fg2=320 N. The scales are separated by a distance of 2.00 m. How far from the woman’s feet is her center of gravity?
When a gymnast performing on the rings executes the iron cross, he maintains the position at rest shown in figure (a). In this maneuver, the gymnast’s feet are off the floor. The primary muscles involved in supporting this position are the latissimus dorsi (“lats”) and the pectoralis major (“pecs”). One of the rings exerts an upward force Fh on a hand as shown in figure (b). The force Fs is exerted by the shoulder joint on the arm. The lats and pecs major muscles exert a total force Fm on the arm. Using the information in the figure, find the magnitude of the force Fm for an athlete of weight 750 N. Hint Fh = 750/2 N.
A uniform 120O N piece of medical apparatus that is 3.5 m long is suspended horizontally by two vertical wires at its ends. A small but dense 550N weight is placed on the apparatus 2.0 m from one end, as shown in the figure. What are the tensions, A and B, in the two wires? A 2.0 m 3.5 m A = 880 N, B = 880 N O A = 840 N, B = 910 N O A = 910 N, B = 840 N O A = 9000 N, B = 8200 N Other:
An 88 kg person stands on a uniform ladder 4.0 m long, that weighs 100 N, as shown in the figure(Figure 1). The floor is rough; hence, it exerts both a normal force, f1, and a frictional force, f2, on the ladder. The wall, on the other hand, is frictionless; it exerts only a normal force, f3. Figure f₁ mg f3 a-3.8 m 1 of 1 Part A Using the dimensions given in the figure, find the forces exerted on the ladder when the person is halfway up the ladder. Express your answers using two significant figures separated by commas. fi, f2, f3 962.4,157.17,157.17 Submit ΓΨΠ ΑΣΦ Part B Previous Answers Request Answer X Incorrect; Try Again; 9 attempts remaining f1, f2, f3 = w Find the forces exerted on the ladder when the person is three-fourths of the way up the ladder. Express your answers using two significant figures separated by commas. VE ΑΣΦ kN ≈ ? kN
A 58 kg circus performer hangs from a bar suspended from a ceiling as shown in the figure. If the bar masses 12 kg (and its weight acts at its center) and has a length of1.4 m, what is the tension T2 in the rope? (The rope is attached 0.85 m along the bar).