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1 The transfer of heat from the body's interior to the surface is achieved primarily through the flow of blood. In cold surroundings blood flow near the skin is reduced by constriction of capillaries. This allows the skin to provide the insulation. Skin temperature can drop to as low as 15 degrees reducing the heat loss from the skin to the environment while the body maintains its normal temperature of about 37 degrees. When your skin temperature is 29 degrees what is the effective average thickness of the insulating layer of tissue separating the skin at 29 degrees from the body interior at 37 degrees. (assume the average surface area of a typical person is 1.5m squared and the average heat transfer is 120 Watts)
2. A young couple realize that by eating to much ice cream and cake they over ate by about 500 calories. To compensate they want to do an equivalent work climbing stairs or a mountain. How much vertical height must they walk up. (each has a mass of 60 kg. assume that a body transfers energy with the efficiency of 20 %)
questiona 5kg block at first has a speed of 1.5ms at the top of a 30?nbspincline and slides a distance of 5.0m down
A ladder 2.05 m long, weighing 229 N, initially lies flat on the ground. The ladder is raised to a vertical position. Compute the work done by the force lifting the ladder
A Packing crate is placed on a 20 degree inclined plane. Ifthe coefficient of the static friction between the crate and theplane is 0.65, will the crate slide down the plane
A diverging lens is to be used to produce avirtual image one-fifth as tall as theobject. Where should the object be placed
a student at teh edge of a building roof and throws a ball 1 straight up with an initial speed of 10 ms. he then throws
A heat engine absorbs 2400 J of heat from a hot reservoir and releases 1400 J of heat to a cold reservoir each second. Find the efficiency of the engine and its mechanical power output
Q. How do i find the height of a triangular prism with the given volume of 35 ft cubed and a given base of 30 ft squared?
A two-slit pattern is viewed on a screen 1.08 m from the slits. what is the total width of the central bright fringe
A 1.81 kg block and a 3.62 kg block are initially at rest on a frictionless, horizontal surface, How much does the kinetic energy of the system increase
A satellite of mass 310 kg is launched from a site on the Equator into a circular orbit at 8000 km above Earth's surface. DATA: Rearth=6.38×106 m. a) What is the acceleration of gravity at this altitude? b) What is the speed of the satellite? c) What..
One generator uses a magnetic field of 0.185 T and has a coil area per turn of 0.0405 m2, What magnetic field should be used in the second generator
An electron in hydrogen emits a photon with a wavelength of 12.4 um and ends up in the n=6 state. What is the initial state of the atom
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