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(a) Estimate (roughly) the total power radiated by your body, neglecting any energy that is returned by your clothes and environment. (Whatever the color of your skin, its emissivity at infrared wavelengths is quite close to 1; almost any nonmetal is a near-perfect blackbody at these wavelengths.)
(b) Compare the total energy radiated by your body in one day (expressed in kilocalories) to the energy in the food you eat. Why is there such a large discrepancy?
(c) The sun has a mass of 2 x 1030 kg and radiates energy at a rate of 3.9 x 1026 watts. Which puts out more power per units mass-the sun or your body?
A white-crowned sparrow flying horizontally with a speed of 1.90m/s folds its wings and begins to drop in free fall. How far does the sparrow fall after traveling a horizontal distance of 0.600m
A vacuum cleaner belt is looped over a shaft of radius 0.44cm and a wheel of radius 1.50cm. What is the speed of a point on the belt
The initial temperature of 150g of ice is -20 degrees Celsius. How much additional heat is required to heat the water
As a positron moves through a region of space, its speed increases from 2.80 X10^6 m/s to 8.00 X10^6 m/s. The electric force is the only force acting on the positron. Across what potential difference did the positron travel?
A box of mass 52 kg is pushed up an incline that has a total length of 7.0 m and is tilted 21° away from the horizontal. What is the work done by the applied force
A Calcium surface (work function = 2.87 eV) is illuminated with 200 nm light from a 2 mW laser. How many photons per second are emitted by the laser?
Radioactive isotopes frequently occur together in mixtures. Assume a 400g sample contains, with a half-life of 12 days, and, with a half-life of 4.5 days. If there are firstly twice as many calcium atoms as there are barium atoms, what will be the ra..
a 247 kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. the ramp is inclined
A 95-{rm m}-long train begins uniform acceleration from rest. The front of the train has a speed of 25 {rm m/s} when it passes a railway worker who is standing 120m from where the front of the train started. What would be the speed of last car as ..
A mass is at rest on a spring in a liquid with density = 1500kg/m^3. The spring has a force constant of 200N/m, determine the density of the mass
A potter's wheel a thick stone disk of radius 0.500 meter and mass 125 kilogram is freely rotating at 50.0 rev/min. Determine the effective coefficient of kinetic friction between the rag and the wheel
Your cup of coffee is too hot to drink when served at 95.What is mass of an ice cube, taken from a -19.0 freezer, that will cool your coffee to a pleasant 62.
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