Gold forms a substitutional solid solution with silver. compute the weight percent of gold that must be added to silver to yield an alloy that contains 6.5 × 1021 au atoms per cubic centimeter. the densities of pure au and ag are 19.32 and 10.49 g/cm3, respectively. the atomic weights for gold and silver are 196.97 and 107.87 g/mol, respectively.

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

Afour cylinder four-stroke in-line engine has a stroke of 160mm, connecting rod length of 150mm, a reciprocating mass of 3kg and its firing order is 1-3-4-2. the spacing between cylinders is 100mm. i. show that the engine is in balance with regard to the primary inertia forces and primary 3. a and secondary inertia couples. li determine the out of balance secondary inertia force ii. propose ways of balancing this out of balance force and discuss the challenges that will arise