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A man strides across a bed of embers. Assume the glowing charcoal is covered with a thin layer of ash 0.50 mm thick and is at a temperature of 650C. The thermal conductiviity of ash and charcoal is 1.5 W/ (mxK). (a) Estimate the heat transferred to the feet of the walker as he traverses the embers in six quick steps. Assume the area of hte bottom of each foot comes into only 50% contact with the embers and the contact lasts 0.10seconds for each step. (b) Assume he steps onto the fire from slightly wet grass. If his feet are protected by the conversion of water from a liquid to a gas, how much water is need to carry away the heat from part a? (c) How thick would this layer of water on the sole of each foot need to be? (d) Describe what would happen if instead he were to take the same six quick steps across a slab of iron at the same temperature. If someone could help me it would be much appreciated.
A 5 m x 12 m swimming pool slopes linearly from a 1.20 m depth at one end to a 3.40 m depth at the other. What is the mass of water in pool.
A rigid tank contains 1.20 moles of an ideal gas. Determine the number of moles of gas that must be with Illustrate from the tank to lower the pressure of the gas from 24.2 atm to 5.30 atm. suppose the volume of the tank and the temperature of the..
A string is wrapped around the disk of mass m = 1.8 kg and radius R = 0.11 m. Starting from rest, you pull the string with a constant force F = 8 N along the nearly frictionless surface. At an instant when the center of the disk has moved a distan..
Sally travels by car from one city to another. She drives for 30.0 min at 69.0 km/h, 37.0 min at 34 km/h, and 54min at 74.0 km/h and she spends 13.0 min eating lunch and buying gas.
A spring has a spring constant = 40 N/m. It is compressed by a distance 10 cm. The mass of the cart is 300 grams. The angle of incline of the track is 20º.
assume that the microwave radiation has a wavelength of 11.2 cm. How many photons are required to heat 235 mL of coffee from 25.0 ^circ rm C to 62.0 ^circ rm C.
A lightweight string of length 60cm is attached to the ceiling at points separated by distance. Three objects of equal mass are hung from the string, separating the string into 4 equal segments of length L. If θ = 40, find the measure of angle φ a..
A screen is placed 51.0 cm from a single slit that is illuminated with light of wavelength 677 nm. If the distance between the first and third minima in the diffraction pattern is 2.80 mm, what is the width of slit.
A 7 g bullet collides horizonally with a 43 g block resting on a frictionless horizontal surface as shown in the accompany diagram. The bullet remain embedded in the block and subsequently causes the block to slide down a frictionless slope onto a..
What is the magnitude of the runner's total displacement . What is the phase difference between the two waves next they reach the observer.
How many kilocalories of heat are produced when the brakes are used to bring a 930 kg car to rest from a speed of 102 km/h.
What is the charge density on the surface. suppose that air resistance can be neglected.
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