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Question: (a) Estimate a thermal velocity for an iron atom at its melting temperature. Suppose an iron atom in the liquid must travel a distance of 1 Å to reach a suitable site on a growing crystal surface. If the growth rate of the solid into the liquid is 1 cm/min, what fraction of iron atoms attach to the surface sites?
(b) Why is this fraction so low? (Hint: You may challenge the assumption of a 1 Å travel.) Why is this fraction even lower if the undercooling is smaller, and the growth rate is slower?
If a 200 lb bungee jumper jumps from a bridge 150 ft and touches the top of the river. If the cord absorbs 14 percent of the energy how far will be man be at the Top of the next bounce from the river bottom.
An aluminum wire has a cross-sectional area of 2.70x 10^-6 m^2 and carries a current of 7.50 A. The mass density of aluminum is 2.70 g/cm^3. find the average speed of the electons in the wire.
Over the course of a multi-stage 4080-km bicycle race, the front wheel of an athlete's bicycle makes 2.00 106 revolutions. How many revolutions would the wheel have made during the race
A 0.55 kg book slides on ahorizontal table. The kinetic friction force on the book hasmagnitude 1.2 N. How much work is done on the book by frictionduring a displacement of 9.0 m to the left
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Two displacement vectors each have magnitude 26 km. One is directed 45° below the +x-axis; the other is directed 45° above the +x-axis. What is the vector sum of these two displacements
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A car with mass M traveling with speed V has a kinetic energy KE. What is the kinetic energy of a second car that has mass M/2 and travels with speed 2V
An electron follows a helical path in a uniform magnetic field of magnitude 0.422T. The pitch of the path is 6.81 ?m, and the magnitude force on the electron is 1.59 x 10-15 N. What is the electron's speed?
1 an egg is thrown horizontally off the roof sl. which is 20meter high with initail velocity of 6.5ms. how far from the
A diverging lens with a focal length of -14 cm is placed 10 cm to the right of a converging lens with a focal length of 18 cm. Where will the final image be located
what is the current potential difference and dissipated power for each when they are connected in
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