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The resistivity of the body is a good measure of its overall composition. A measure of the resistance of the upper arm is a good way to estimate the percent fat in a person's body. Let's model a person's upper arm as a cylinder of diameter 8.0 cm and length 20 cm. We can model the composition of the arm by assuming that the muscle, far, and nonconductive portions (the bone) form simple regions. This simple model actually works quite well. For a typical adult, the bone has a cross-sectional area of 1.0 cm2; to a good approximation, the balance of the arm is fatty tissue or muscle. A. Assume that the arm has 30% fat and 70% muscle. What is the resistance of the arm? B. Now, assume that the arm has only 10% muscle. What is the resistance now? The measurement of the resistance of the arm is made by applying a voltage and measuring a current. Too much current can be uncomfortable and, as we will see, can be dangerous. Suppose we wish to limit the current to 1.0 mA. For each of the above cases, what is the maximum voltage that could be employed?
q1. a toolbox is carried from the base of the ladder at point a. the toolbox comes to a rest on a scaffold 5.0 m above
A hot iron horseshoe (mass = 0.50kg ), just forged, is dropped into 1.50L of water in a 0.30kg iron pot initially at 25.0?C. estimate the initial temperature of the hot horseshoe
A system consists of a ball of mass M2 and a uniform rod of mass M1 and length d. Derive an expression for the angular momentum of the rod about point P before the collision
A speeder is pulling directly away and increasing his distance from a police car that is moving at 27 m/s with respect to the ground. Find the speeder's speed with respect to the ground
The vector shows the weight of the stone. Complete the vector diagram showing another vector that results in zero net force on the stone. Illustrate what is the conventional name of the vector you have drawn?
A 50g marble moving at 2.2m/s strikes a 30g marble at rest. Assume the collision is perfectly elastic and the marbles collide head-on. What is the speed of the first marble
A 121 cm length of string has a mass of 2.40 g. It is stretched with a tension of 6.80 N between fixed supports. What is the lowest resonant frequency of this string
A computer to be used in a satellite must be able to withstand accelerations of up to 27 times the acceleration due to gravity. What is the minimum amplitude of vibration that must be used in this test
A 4.20-g bullet embeds itself in a 20.0-kg block, which is attached to a horizontal spring with a force constant of 950 N/m. find the speed of the bullet just before it hits the block
A hill that has a 25.7% grade is one that rises 25.7 m, At what angle is such a hill inclined above the horizontal
Two light bulbs labeled 50 W and 100 W, find the actual power consumed by the brighter bulb
Diffraction plays an important role in which of the following phenomena.
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