3. A block with a mass of 12 kilograms is attached to a horizontal spring with a spring constant of 100 newtons per meter. Initially the block is held at rest in place so that the spring is stretched 0.1 meters past its equilibrium point (we will use the stretched direction as the positive direction for the position). For the first 2 seconds, an external force of 4 newtons in the stretched direction is applied before the external force is shut off. (a) external force, find the value of the drag coefficient (you do not need to worry about units). Assuming that the oscillation would be in the critical damping case if there was no (b) block in meters at time t seconds. DO NOT SOLVE THE INITIAL-VALUE PROBLEM! Give the initial-value problem modeling this scenario where a(t) is the position of the

3. A block with a mass of 12 kilograms is attached to a horizontal spring with a spring constant of 100 newtons per meter. Initially the block is held at rest in place so that the spring is stretched 0.1 meters past its equilibrium point (we will use the stretched direction as the positive direction for the position). For the first 2 seconds, an external force of 4 newtons in the stretched direction is applied before the external force is shut off. (a) external force, find the value of the drag coefficient (you do not need to worry about units). Assuming that the oscillation would be in the critical damping case if there was no (b) block in meters at time t seconds. DO NOT SOLVE THE INITIAL-VALUE PROBLEM! Give the initial-value problem modeling this scenario where a(t) is the position of the

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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B3
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The figure shows a person wearing weight boots and doing lower leg flexion/extension exercise in a sitting position to strengthen the quadriceps muscles and a simple mechanical model of his leg. W1 is the weight of the lower leg, W0 is the weight of the boot, the magnitude of the pulling force applied to the tibia by the quadriceps muscles through the FM patellar tendon, the magnitude of the reaction force acting on the FJ tibiofemoral joint. Point O is the center of the tibiofemoral joint, point A is the point where the patellar tendon attaches to the tibia, point B is the center of gravity of the lower leg, point C is the center of gravity of the weight boot. The distances between point O and points A, B and C were measured as a=12 cm, b=24 cm and c=36 cm, respectively. The angle that the long axis of the tibia makes with the horizontal is β=39°, the angle between the line of action of the quadriceps muscle strength and the long axis of the tibia is α=16°. Points O, A, B and C lie…
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