Engineering Answers

David who seeks to a certain amount of money today such that after 4 years he can withdraw $3,000. The applicable discount rate is 5% to be compounded half early. Calculate the amount that David is required to deposit today.

Company "Rich" pays $2 in dividends annually and estimates that they will pay the dividends indefinitely. How much are investors willing to pay for the dividend with a required rate of return of 5%?

Let's say Bob invests $1,000 for five years with an interest rate of 10%. The future value would be?

If you deposit $6500 into an account paying 8% annual interest compounded monthly, how much money will be in account after 7 years?

A light hangs in 15 feet directly above a straight walk on which a man is 6 feet tall is walking. How fast is the end of the man's shadow travelling when he is walking away from the light at the rate of 3 miles per hour?

Listed below is a combination of stresses acting at a point and referred to axes x and y in an elastic material. Using Mohr’s circle of stress determine the principal stresses at the point and their directions for each combination.

i) sigma x=-60 N/mm^2, sigma y=-36N/mm^2, shear stress (xy) =5N/mm^2

ii) sigma x=30 N/mm^2, sigma y=-50N/mm^2, shear stress (xy) =30N/mm^2

In crank and slotted lever quick return mechanism, the crank length is (100 +X )mm and the distance between the fixed center is (225+X)mm. The length of the slotted lever is (525+X)mm. Determine the ration of time of cutting stroke to time of return stroke. Also calculate the length of the stroke .  

A person puts a few apples into the freezer at -12°C to cool them quickly for guests who are

about to arrive. Initially, the apples are at a uniform temperature of 30°C, and the heat transfer

coefficient on the surfaces is 21 W/m2·°C. Treating the apples as 9-cm-diameter spheres and

taking their properties to be ρ = 900 kg/m3, Cp = 3.81 kJ/kg·°C, k = 0.615 W/m·°C, and α = 1.4×10-7 m2/s, determine the center and surface temperatures of the apples in 1.5 h. Also, determine the amount of heat transfer from each apple. Use Heisler chart to solve the problem.