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The human body must maintain its core temperature inside a rather narrow range around 37°C. Metabolic processes, notably muscular exertion, convert chemical energy into internal energy deep in the interior. From the interior, energy must flow out to the skin orlungs to be expelled to the environment. During moderate exercise,an 80 kg man can metabolize food energy at the rate 300 kcal/h, do60 kcal/h of mechanical work, and put out the remaining 240 kcal/hof energy by heat. Most of the energy is carried from the body interior out to the skin by forced convection (as a plumber wouldsay), whereby blood is warmed in the interior and then cooled atthe skin, which is a few degrees cooler than the body core. Without blood flow, living tissue is a good thermal insulator, with thermalconductivity about 0.210 W/m·°C. Show that blood flow isessential to cool the man's body by calculating the rate of energyconduction in kcal/h through the tissue layer under his skin. Assume that its area is 1.20m2, its thickness is 2.50 cm, and it is maintained at37.0°C on one side and at 34.0°C on the other side.
An object with a mass of m = 1.10 kg is connected to a spring with a spring constant of 9.13 N/m. The object is displaced to the right of the equilibrum position by a distance of x(0) = 26.0 cm, What is the maximum speed reached by the object
A 1.80kg block slides on a rough horizontal surface. The block hits a spring with a speed of 2.50m/s, what is the force constant of the spring?
Gas is confined in a tank at a pressure of 11.3 atm and a temperature of 22.5°C. what is the pressure of the gas remaining in the tank
Suppose you are at the earth's equator and observe a satellite passing directly overhead and moving from west to east in the sky. How far above the earth's surface is the satellite's orbit
A student places her 350 g physics book on a frictionless table. She pushes the book against a spring, compressing the spring by 4.0 cm, What is the book's speed as it slides away
imagine that you recently found out you live close to a superfund site. identify the most important information you
Water at 2 kg/s is the working fluid in the power cycle shown below. Saturated liquid at 10 kPa enters the pump, What is the overall efficiency of the entire cycle
q1. two charges are placed on the x axis. one of the charges q1 6.95c is at x1 3.00 cm and the other q2 -27.3c is at
A 76 kg student traveling in a car with a constant velocity has a kinetic energy of 1.1 multiply.gif 104 J. What is the speedometer reading of the car in km/h
A concave mirror (R = 56.0 cm) is used to project a transparent slide onto a wall. How far from the wall should the mirror be located
A train is moving parallel and adjacent to a highway with a constant speed of 23 m/s. Initially a car is 57 m behind the train, What is the speed of the car just as it passes the train
What would be the equilibrium temperature when a 271 g block of copper at 280°C is placed in a 169 g aluminum calorimeter cup containing 817 g of water at 11.5°C.
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