EBK PHYSICS FOR SCIENTISTS AND ENGINEER
6th Edition
ISBN: 9781319321710
Author: Mosca
Publisher: VST
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Chapter 12, Problem 16P
To determine
To Find:Mechanical advantage of the system.
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Trina is a gym goer with a leg length of 84 cm. Suppose that she is in the gym doing straight legraising with 10 lb weights.
Compute for the force that the muscle should exert in order to (1) maintain it in the position and(2) lift the weight up given that the distance of the effort (muscle) from the joint is 54 cm,distance of the weight is 80 cm, and the COM is 45 cm from the joint.
ANSWER THESE QUESTIONS:
1.) Compute for the force that will maintain the position.
2.) Compute for the force needed to lift the weight higher.
3.) Assuming that the hip flexion angle is at 60 degrees, compute for the lineardisplacement of the leg.
In a lever, fulcrum is at one end at a distance of 30 cm from the load and effort is at the
other end at a distance of 90 cm from the load. Find :
(a) the length of load arm,
(b) the length of effort arm, and
(c) the mechanical advantage of the lever.
As shown in the figure below, a uniform beam is supported by a cable at one end and the force of friction at the other end. The cable makes an angle of e = 30°, the length of the beam is L = 3.25 m, the
coefficient of static friction between the wall and the beam is u = 0.400, and the weight of the beam is represented by w. Determine the minimum distance x from point A at which an additional weight 2w
(twice the weight of the rod) can be hung without causing the rod to slip at point A.
m
2w
Chapter 12 Solutions
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
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- John is performing an isometric contraction of the quadriceps to hold a 500 N weight at an angle of 45° of knee extension (i.e., 45° below the horizontal). Assume the length of the lower leg is 42.5 cm. How much force must the quadriceps produce if the moment arm for the patellar tendon is 10 mm?arrow_forwardect loca tecd What would happen to the stick? the Figure A 10m long uniform bar with a 80 W is attac hed by africtionless hinge to weighte of horizontal rope that wall and held by a malces anr le Qof 37° witn the bar. Culculate the distance from the hinge, x, tha t the 10kg tension T in the rope is 25N. Hint: Use g 10 W/kg, sin37°360 and cos 37°: 9. ang should besus peded if the n fo?arrow_forwardWe analyzed the biceps muscle example with the angle between forearm and upper arm set at 90 degree (see figure below). Find the force exerted by the biceps muscle when the angle is 100 degree and the forearm is in a downward position. (Assume that r_1 = 5.0 cm, r_2 = 18cm, r_3 = 36 cm, m_a = 2.0 kg, and m_b = 3.0kg. Enter the magnitude.) Narrow_forward
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