Engineering Answers

The current i(t) in a simple electric circuit is modeled by the differential equation d +Ri = E(t) where time L is inductance and E(t) is the voltage at time t. Using the method of undetermined coefficients, determine the charge, 4(t), at any time t, given that L = 4,R = 12, E(t) = 4sin(2t) , i(t) = d9 and that the initial current and charge is zero [15]

How quantitative research related or important to different field of discipline stated

(a) For a self-bias circuit, the transistor is a silicon device, RE =200Ω, R1=10R2=10kΩ, 

RC=2kΩ, β=100 and VCC= 15V. Determine the values of ICQ and VCEQ. (8 marks)

What is the steady-state radon concentration in the closed-up cellar with 0.05 ACH? What is the primary sink of radon now?

The ventilation rate in the cellar is decreased to 0.05 ACH in an experiment to see what concentration of ethylene will occur. Ethylene, which stimulates ripening, is being released at a rate of 7µg/hr by apples stored in the cellar. What is the steady-state ethylene concentration?

If the volume of the room is 15 m3, what ventilation rate in ACH must be maintained to keep radon levels below the US EPA recommended limit of 4 pCi/liter? What is the primary sink for radon in the cellar?

A root cellar receives an input of 0.1µCi of radon-222 per hour through the dirt floor. Radon-222 has an approximate half-life of 3.8 days.

Calculate Machine Cutting Time (show all work) A person cuts a piece of Bronze that is 4" long with a 2" Dia., down to 1.600 Dia. It is done in 3 passes. (2 roughing and 1 finishing pass) Length Time = Rate Rpm Length = Length of cut Rate = Feed x Rpm CS x 4 D Pass 3 = 1.610 to 1.600 dia. Pass 1 = 2" to 1.800 dia. Pass 2 = 1.800 to 1.610 dia. CS = 90 for roughing and 100 for finishing. Feed = .015 - .025 roughing and .003 - .010 finishing Length = 4" What is the machine cutting time in seconds)?

Write a technical document on any topic in ethics. You are to make references from other sources and cite them in your write-up. Your paper should have at least the following parts:

• Introduction

• Body

• Conclusion

You can add sub-headings based on your topic. Write between 2 to 5 pages

Below are examples of the ethical issues you can write on

1. Ethics and morality

2. Professional ethics

3. Ethical orientations

4. Intellectual property

5. Copyrights

6. Patents

7. Privacy

8. Computer crimes

9. Computer security

10. Piracy

11. etc