Civil and Environmental Engineering Answers

Percent reduction in bearing capacity of a strip foundation resting on sand under flood conditions (water level at the base of the foundation) compared to a situation where the water level is at a depth much greater than the width of the foundation is approximately

5. What is meant by the current description of the global economy that “time and distance have been compressed”? Do you agree? What has been the impact of this compression? ​​    10

NB: Please check plagiarism and required marks is 10 marks

Solve the initial value problem y'' -12y' + 20y = 4e^3x ; y(0) = 3; y'(0) = 0 by first finding

the homogeneous solution, base solution, general solution and then finally the particular

solution.

Solve the boundary value problem  y''+5y'+6y=0; y(0)=2; y'(1)=3

Find the equivalent capacitance of a 4.20-µF capacitor and an 8.50-µF capacitor when they are connected (a) in series and (b) in parallel.

3.) When a battery is connected to the plates of a 3.00-µF capacitor, it stores a charge of 27.0 µC. What is the voltage of the battery?

[Refer to item #3] If the same capacitor is connected to another battery and 36.0 µC of charge is stored on the capacitor, what is the voltage of the battery?

When a battery is connected to the plates of a 3.00-µF capacitor, it stores a charge of 27.0 µC. What is the voltage of the battery?

A 50.0-g sample of copper is at 25.0°C. If 1 200 J of energy is added to it by heat, what is the final temperature of the copper?

A 1.0-kg bar of copper is heated at atmospheric pressure so that its temperature increases from 20°C to 50°C. How much energy is transferred to the copper bar by heat?

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Where can Jill get a sample contract to help her write the terms of a new contract?

Jill is an architect at a construction firm. Next month she is going to begin her work on a new project. However, she does not know what terms to include in the contract with the owner. So, she decides to get contract sample from to help her draft the contract.

A line is recorded as 475.25 m long. It is measured with a 6.5 N tape which is 30.492 m long at 68⁰F under a 10 lb. pull supported at end points. During measurement the temperature is 4.5⁰C and the tape is suspended under a 71 N pull. The line is measured on 3% grade. What is the true horizontal distance? Modulus of elasticity of the tape is 1.93 X 10⁸ KPa and cross-sectional area of tape is 0.0284 cm². Coefficient of expansion of the tape material is 0.0000116 m/⁰C.