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A resting adult of average size converts chemical energy infood into internal energy at the rate of 120 W, called herbasal metabolic rate. To stay at a constant temperature,energy must be transferred out of the body at the same rate.Several processes exhaust energy from your body. Usually the mostimportant is thermal conduction into the air in contact with yourexposed skin. If you are not wearing a hat, a convection current ofwarm air rises vertically from your head like a plume from asmokestack. Your body also loses energy by electromagneticradiation, by your exhaling warm air, and by the evaporation ofperspiration. Now consider still another pathway for energy loss:moisture in exhaled breath. Suppose you breathe out 25.0 breaths per minute, each with a volume of0.600 L. Suppose also that you inhale dry air and exhale air at37°C containing water vapor with a vapor pressure of3.40 kPa. The vapor comes from theevaporation of liquid water in your body. Model the water vapor asan ideal gas. Assume its latent heat of evaporation at 37°C isthe same as its heat of vaporization at 100°C. Calculate the rate at which you lose energy by exhaling humid air.
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A uniform metal ball of mass 31g and radius 1.4cm rollsdown(without slipping) a slope of height 32cm from rest. Find its linear speed and angular speed
Smoke particles in the air typically have masses of the order of 10 to 16 kg. The Brownian motion (rapid, irregular movement) of these particles, resulting from collisions with air molecules, can be observed with microscope.
A physics professor is pushed up a ramp inclined upward at an angle 31.0 above the horizontal as he sits in his desk chair that slides on frictionless rollers. The combined mass of the professor and chair is 90.0 . He is pushed a distance 2.85along t..
If in Joule's paddlewheel experiment a block of mass 10 kg is allowed to fall through 22.5 meters and the mass of the water is 50 grams
A heavy-duty stapling gun uses a 0.164 kg metal rod that rams against the staple to eject it. The rod is pushed by a stiff spring called a "ram spring" (k = 30071 N/m). find the speed of the ram at the instant of contact
Do sound waves exhibit diffraction effects? If so, determine the "slit" width that would diffract an audible sound wave (frequency between 20 Hz and 20 kHz). Would a doorway work or do you need a different sized opening?
You are to make four straight-line moves over a flat desert floor,starting at the origin of an xy coordinate system andending at the xy coordinates (-135 m, 40 m). The xcomponent and y component of your moves are the following,respectively, in met..
A particle is located at r=(4.1i+3.1j+5.6k)m . A force F=(9.5j-3.5k)N acts on it. What is the torque, calculated about the origin
An electron is in a vacuum near earth's surface and located at y =0 on a vertical y axis. At what value of y should a second electronbe placed such that its electrostatic force on the first electronbalances the gravitational force on the first electr..
What is magnitude of the speed of the boat relative to a stationary shore observer. A person stands at a point that is 4 m from one of the speakers and 4.4 m from the other. Does the person hear the tone? Explain.
Two infinte parallel plates separated by a distance sare at potentials 0 and V0, What are the charge densities on the plates
Amber (n = 1.546) is a transparent brown-yellow fossil resin. An insect, trapped and preserved within the amber, How far below the surface is the insect actually located
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