Civil and Environmental Engineering Answers

In a piston-and-cylinder apparatus the initial volume of air is < 90 – 120 > L at a pressure of < 100 – 130 > kPa and temperature of 26 °C. If the pressure is doubled while the volume is decreased to < 50 – 60 > L, compute the final temperature and density of the air.

 If < 2.2 – 4.3 > m3 of substance weighs <20 - 40 > kN, calculate the following.

a.) Specific weight

b.) Density

c.) Specific gravity

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?

At 200C, there is a gap d = 0.2 mm between the lower end

of the bronze bar and the rigid slab supported by two

steel bars as shown. Neglecting the mass of the slab,

determine the stress in each rod when the temperature

assembly is increased to 1000C.

Given: A steel rod (A= 150 mm2) is stretched between

two fixed points with a tensile load of 5000 N at 200C.

a.) What will be the stress at -200C?

b.) At what temperature will the stress be zero?

Assume α = 11 .7 μm/m0C, and E = 200 Gpa

An open tube is attached to a tank as shown. If the water rises to a height of 800mm in the tube, what are the pressure a and b of the air above water? Neglect capillary effects in the tube