A uniform barbell has length 1.5 m and mass 60 kg. Your left hand is placed 25 cm to the left of the center, while your right hand is placed 35 cm to the right of the center. What is the magnitude of force exerted by your left hand? 420 N 823 N 343 N 294 N 245 N

A uniform barbell has length 1.5 m and mass 60 kg. Your left hand is placed 25 cm to the left of the center, while your right hand is placed 35 cm to the right of the center. What is the magnitude of force exerted by your left hand? 420 N 823 N 343 N 294 N 245 N

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter14: Static Equilibrium, Elasticity, And Fracture

Section: Chapter Questions

Problem 78PQ: A massless, horizontal beam of length L and a massless rope support a sign of mass m (Fig. P14.78)....

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A massless, horizontal beam of length L and a massless rope support a sign of mass m (Fig. P14.78). a. What is the tension in the rope? b. In terms of m, g, d, L, and , what are the components of the force exerted by the beam on the wall? FIGURE P14.78
A person carries a plank of wood 2.00 m long with one hand pushing it down at one end with a force F1 and the other hand holding it up with a force F2 at a distance of 0.500 m from the same end of the plank. If the plank has mass 20.0 kg and the center of mass of the plank is in the middle of the plank, what are the magnitudes of the forces F1 and F2? a. F1 = 392.4 N, F2 = 196.2 N b. F1 = 392.4 N, F2 = 392.4 N c. F1 = 196.2 N, F2 = 392.4 N d. F1 = 196.2 N, F2 = 196.2 N
A person carries a plank of wood 2.00 m long with one hand pushing it down at one end with a force F, and the other hand holding it up with a force F, at a distance of 0.500 m from the same end of the plank. If the plank has mass 20.0 kg and the center of mass of the plank is in the middle of the plank, what are the magnitudes of the forces F and F,? F, = 196.2 N, E, = 392.4 N F2 F, = 392.4 N, F, = 392.4 N %3D F, = 196.2 N, F, = 196.2 N %3D 3 4 F, = 392.4 N, F, = 196.2 N || %3D
A bowler holds a bowling ball with mass M = 6.7 kg in the palm of his hand. Lower arm has mass m = 1.6 kg. As the figure shows, his upper arm is vertical and his lower arm is horizontal.What is the magnitude of (a) the force of the biceps muscle on the lower arm and (b) the force between the bony structures at the elbow contact point? Biceps Elbow contact point 4.0 cm 18 cm- (a) Number (b) Number 32 cm- Lower arm (forearm plus hand) center of mass Units Units
In exercise physiology studies, it is sometimes important to determine the location of a person’s center of mass. This determination can be done with the arrangement as shown. A light plank rests on two scales, which read Fg1 = 380 N and Fg2 = 320 N. A distance of 1.65 m separates the scales. How far from the woman’s feet is her center of mass?
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A beam of negligible mass and a length of 1.00 m balances two masses m₁ 16 kg and m₂ = 8 kg. The distance of m₁ from the fulcrum is 20 cm. Let the distance of m₂ from the fulcrum be d2. Assume all quantities are correct to 3 significant figures. m2 m2g (a) For first condition equilibrium is m₁g-m₂g. N=0. N O N-m₁g-m₂g-0. N+m₁g-m₂g=0. N-m₁g+m₂g=0. mi mig (b) Match the directions of rotations induced by the forces about the fulcrum: A. N no rotation B. mg clockwise C. m₂g counter-clockwise
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8₁ 02 9. The diagram of the leg shows the femur (1) and tibia (2). The quadriceps muscle (3) applies a force to the lower leg via a tendon (4) that is embedded with the kneecap (5). If the force applied by the muscle to the tendon is F 570 N, what is the force of the femur on the kneecap, if the leg is in equilibrium? A simplified model of the leg is shown next to the diagram. The leg bones are represented by two beams attached by a pin. The tendon is modelled by a rope and the kneecap acts like a pulley. The tendon above the kneecap makes an angle 8, = 38° with respect to the vertical, and the portion of the tendon below the kneecap makes an angle of 6₂ = 10° with respect to the vertical. Enter the x component, followed by the y component. Answer 1 of 2: Answer 2 of 2: Submit All Answers
Consider the 120-cm board supporting three loads as shown below. The beam weighs 45 grams. If the system is in equilibrium, a. what is the magnitude of the force exerted by the pin support to the board? b. Find the perpendicular distance, x, of the pin support from the left end of the board. 30cm A В C 259 30g 75g
1. The picture shows a heavy ball held in the palm of a hand. The mass of the ball M is 7.5 kg. The lower arm is horizontal and is held by the force from the bicep Biceps muscle in the vertical upper arm. Given that the mass of the lower arm is 2.0 kg, what is the magnitude of (a) the force of the biceps muscle on the lower arm and (b) the force between the bony structures at the elbow Elbow contact contact point? point 4.0 cm Lower arm (forearm plus hand) center 15 cm Draw a free body diagram to indicate all the forces on the lower arm. And write down where is the pivot -33 cm of mass point when you calculate the torque in each part.
The two structural members, one of which is in tension and the other in compression, exert the indicated forces on joint O. Determine the magnitude of the resultant R of the two forces and the angle which R makes with the positive x-axis. The angle is measured counterclockwise from the positive x-axis. 5.4 KN 2.5 KN Answers: R = i 0 = i 31° /1 14 sata, 201 57³ KN O