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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.
Suppose a 76 kg person hangs vertically from a nylon rope. What radius must the rope have if its fractional increase in length is to be the similar as that of the spider's thread.
A circular parallel-plate capacitor with a spacing of 3.2 mm is charged to produce a uniform electric field with strength of 1.50 multiplied by 106 N/C. What plate radius is required if the stored charge is -15.6 µC.
A ranger in a national park is driving at 44 km/h when a deer jumps onto the road 70 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce an acceleration of -3.00 m/s2.
A transverse pulse moves along a stretched cord of length 5.29 m having a mass of 0.180 kg. If the tension in the cord is 13.4 N, find the following. (a) The wave speed. (b) The time it takes the pulse to travel the length of the cord.
What is the acceleration of two falling sky divers. Some European trucks run on energy stored in a rotating flywheel, with an electric motor getting flywheel up to its top speed of 440 π rad/s. One such flywheel is a solid, uniform cylinder with a ..
A uniform soda can of mass 0.140 kg is 12.00 cm tall and filled with 1.31 kg of soda. After that small holes are drilled in the top and bottom (with negligible loss of metal) to drain the soda.
A spring of force constant k=2.5*10^2 N/m is suspended form a rigid support. An object o mass 1.00 kg is attached to the uns How far below the starting point is equilibrium position for the object.
what is the magnitude of its velocity after the collision. A soccer player applies a force of 60.5 N to a soccer ball while kicking it. If the ball has a mass of 0.42kg, what is the acceleration of the soccer ball.
A parallel plate capacitor has plates of area 2.0*10^3 and plate separation 1.0*10^4m. find the capacitance of this system if air fills the volume between the plates.
An MP3 player operates with a voltage of 3.7 V, and is using 0.28 W of power. Find the current being supplied by the player's battery.
A rigid steel frame above the street intersection supports standard traffic lights, each of that is hinged to hang immediately below frame. A gust of wind sets light swinging in a vertical plane. Find out order of magnitude of its period. Situatio..
A Carnot-efficiency engine operating between a reservoir of liquid mercury at its melting point and a colder reservoir extracts 15.0 J of heat from the mercury and does 4.0 J of work during each cycle. What is the temperature of the colder reservo..
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