Reference no: EM13703827
Magnesia (MgO) has a melting point of 2825C. Applications include refractory bricks, crucibles, cements, thermocouple protection tubes, brake linings, plasma display screens and substrates for thin-film formation.
a) Identify the cation and anion and give quantum numbers for one of the electrons donated by the cation and one of the electrons accepted by the anion.
b) MgO bonds primarily ionically and the coulombic attraction between ions, FA, is equal to 9.231x10-28 N.m2/ro2, where ro, the equilibrium spacing at Uo (the minimum in potential energy) between cation and anion, is equal to 2.107 Å. Given that U = -A/rm +B/rn and that n=9, calculate the value of Uo in kJ/mol remembering that a N. m is equal to a J.
c) Derive a relationship for Young’s modulus, E, in terms of m, n, A and ro if E = (1/ro)(dF/dr)r=ro.
d) What is the consequence of n being greater than m for thermal expansion?
f) Rank the following metals from lowest to highest binding energies: Mn, Ir, Cd, Ta, V, Na.
What is the weight fraction of epoxy in the fiber glass
: A group of mechanical engineers like catamaran sailing on the Great Salt Lake and decide to use a glass-fiber reinforced composite with a high fiber fraction for a new boat design. The composite is 60 volume % SiO2 glass fibers and the remainder is a..
|
The position of a particle on a straight line
: The position of a particle on a straight line is given by s= (t^3 -9t^2 +15t), where t is in seconds. Find the position, velocity, and acceleration of the particle when t= 6s and the total distance it travels during the 6 second time interval.
|
Determine the velocity of the car
: A car has an initial speed of 25 m/s with a constant deceleration of 3m/s^2. Determine the velocity of the car when t=4s. What is the displacement of the car during the 4 second time interval? How much time is needed to stop the car?
|
The gravitational acceleration as a function of elevation
: At 45° latitude, the gravitational acceleration as a function of elevation z above sea level is given by g = a - bz, where a = 9.807 m/s2 and b = 3.32 x 10-6 s-2. Determine the height above sea level where the weight of an object will decrease by 1.4..
|
Identify the cation and anion and give quantum numbers
: Magnesia (MgO) has a melting point of 2825C. Applications include refractory bricks, crucibles, cements, thermocouple protection tubes, brake linings, plasma display screens and substrates for thin-film formation. Identify the cation and anion and gi..
|
Single plate clutch with both sides of the plate effective
: A single plate clutch with both sides of the plate effective is required to transmit 25 kW at 1600 r.p.m the outer diameter of the plate is limited to 300 mm and the intensity of pressure between the plate not to exceed 0.07 N/mm^2.
|
Design analysis of a single plate clutch
: Give a complete design analysis of a single plate clutch, with both sides effective of a vehicle to transmit 22 kW at a speed of 2800 r.p.m. allowing for 25% overload. The pressure intensity is not to exceed 0.08 N/mm^2 and the surface speed at the m..
|
Space curve describe by the cartesian coordinates
: The particle p moves along a space curve describe by the Cartesian coordinates. Describe the given motion in terms of cylindrical and spherical coordinates by finding explicit equations for the coordinates.
|
Define single shear and double shear
: Define single shear? Define double shear? What is the equation for shear area? What is the equation for shear stress?
|