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In its usual microstructure, small three-dimensional particles made of stacked planar sheets, graphite deforms easily, and is used in pencil lead and lubricants.
It has high conductivity in the plane of the sheet, and very low conductivity perpendicular to the sheet plane. Explain this behavior in terms of a simple chemical bonding model.
Calculate collapse energy (i.e. PE change ) of World Trade Towers: 410 m tall; total mass 1.25 Mega tons; Calculate Change in PE in MJ during collapse. Assume that the whole mass is centered at an
Energy content of gasoline is about 46 MJ/kg or about 37 MJ/Liter. How much energy consumed in kJ per hr? HP? in kW? BTU/h?
Today almost all beverage cans (>77 billion of them per year in the U.S.) are made of thin walled aluminum and can be mangled by infants. Since aluminum is more expensive than steel, why the chan
The steam enters at 25 bar with a velocity of 61 m/s and exits as saturated vapor at 0.06 bar with a velocity of 130 m/s. Neglecting potential energy effects, determine the inlet temperature, in C?
What is the enthalpy change if the final temperature is 600oF; how much work is done if the final temperature is 600oF.
Assuming that the sun radiates evenly in all directions, estimate the diameter of the sun. Ignore effects of reflection and refraction due to earth's atmosphere.
What is the composition, in atom percent, of an alloy that consists of a) 91.5 wt% Ag and b) 8.5 wt% Cu? Assume that the atomic weights for silver and copper are, respectively, 107.87 and 63.55 g/m
The energy for vacancy formation is 0.82 eV/atom, while the density and atomic weight for this metal are 6.94 g/cm3 and 93.07 g/mol, respectively.
How much net work out per kg of total steam flow is done by the system? what is the thermal efficiency of the olant ? f)what is the mass flow rate required fora power output of 100 mw?
Find a) that is the temp and pressure for state 2 of process? b)what is the heat in and heat out per kg? c)what is the temp of state 3&state 4? d)find the thermal efficiency of cycle? f)sketch t
At a distance d from a charge, the magnitude of the electric field is E. What would be the magnitude of the electric field a distance d/2 from the same charge.
For an alloy that consists of 90 at% Zn and 10 at% Cu, what are the concentrations (a) of Zn (in weight percent), and (b) of Cu (in weight percent)?
What is the composition, in atom percent, of an alloy that consists of a) 90.5 wt% Ag and b) 9.5 wt% Cu? Assume that the atomic weights for silver and copper are, respectively, 107.87 and 63.55 g/mo
How much energy is required to cool a single droplet of molten lead all the way down to 0 C?
Calculate the number of vacancies at 546°C given that the energy for vacancy formation is 1.15 eV/atom; assume that the density at both temperatures is the same.
Locate and identify the four inner atoms by their positional parameters. Show one coordination polyhedron around a Ge atom.
Calculate the energy (in kJ/mol) for vacancy formation assuming that the density of the metal remains the same over this temperature range.
Calculate the number of vacancies per cubic meter in some metal at 759°C. The energy for vacancy formation is 0.82 eV/atom.
It undergoes a reversible isothermal expansion to 0.3 MPa. Methane can be considered an idea gas under these conditions. How much heat is transferred?
A gas is stored in a cylinder at a pressure of 6.0x10^5 N/m^22 and at a a temperature of 15 degree C. (a)what will be the pressure of the gas at 55 degree C if the volume of the gas does not change?
A 65 g ice cube at 0°C is heated until 40 g has become water at 100°C and 25 g has become steam at 100°C. How much energy was added to accomplish the transformation?
An aluminum cup contains 225 g of water and a 40 g copper stirrer, all at 27°C. A 420 g sample of silver at an initial temperature of 88°C is placed in the water. The stirrer is used to sti
One swimmer in a relay race has a 0.485 s lead and is swimming at a constant speed of 3.84 m/s. He has 48.5 m to swim before reaching the end of the pool. A second swimmer moves in the same directio