Jobs & Education
Everyone's familiar with the 9 to 5 (or 4 to 11 or 11 to 7). It doesn't matter what shift you work, almost everyone has or is looking for one, job that is. Others might be preparing for the job of their dreams by getting a college or trade school education. Whatever your status, your questions about jobs and education are welcome in this category.
Asked in Jobs & Education, Resume Writing
How do you list salary history on a resume?
How do you find the radius if you have the circumference?
How to calculate power in an inductive load?
Inductive load power is reactive, it is given by the formula: pL(t)=VL(t)IL(t), in time domain (instant power); PL(s)=VL,RMS(s)IL,RMS(s), in Laplace transform domain (RMS denotes root mean square amplitude). VL is the voltage across the inductor L and IL is its current (current enters in the "+" voltage reference pin, by applying user convention in which absorbed power is positive). Power is reactive since voltage and current are always in quadrature: VL(s) = s L IL(s), in Laplace domain (derived from the time-domain formula vL(t)= L diL(t)/dt). A real-life inductor will also show an active power term, which arises from parasitic resistance non-ideality; it can be modeled as a resistance DCR in series with the inductor itself: pACT(t)=DCR IL(t) <<>> An inductive load such as an induction motor draws power from the supply with a power factor of less than 1. Power = voltage x current x power factor. This happens because the current reaches its peak in the ac cycle after the voltage, so that for a small part of the cycle power flows back into the supply from energy stored in the motor's internal magnetic field. The time-lag is measured in degrees and called the phase difference. 360 degrees denotes one complete cycle. The power factor is the cosine of the phase difference, so that (for example) a resistive load has no phase difference so that the power factor is 1, while for a pure inductor the phase difference is 90 degrees and the power factor is zero. If the rms voltage and current are expressed in complex-number form, also known as vectors or phasors, the real power is the real part of VI*, where the asterisk denotes the complex conjugate. Another way to calculate the real power is to calculate the average value of the instantaneous power V x I. If the voltage is Vcos(wt) and the current is Icos(wt+phi) then those expressions can be multiplied together and trigonometry formulas used to show that the power factor is cos(phi) as stated. Real power is measured from the average value of volts times amps with an instrument that contains a voltage coil and a current coil. The force produced is equal to the instantaneous power, and the instrument measures its average value muliplied by the time.
Asked in Jobs & Education, Math and Arithmetic
What do you call the numbers you multiply together?
Define small scale business?
What are the disadvantages of direct marketing?
1. Junk Mail - By using direct mail, a company risks alienating the customers it seeks to gain. The use of direct mail is often associated with a company of lower status and quality. 2. Environmental Impact - Direct marketing typically involves the heavy use of physical components in order to give consumers an object they can hold in their hands. This physical side of direct marketing means that a greater amount of natural resources are consumed in their production as well as a greater amount of pollution. 3. Metrics - It is hard when using direct marketing to get any reliable metrics on its impact. Direct marketing involves a much longer-term strategy where the results are uncertain and the best that can be said is that it may be working. It is often very unclear whether direct marketing is alienating more customers than it is creating. 4. Time - It is hard to get as immediate of an impact when using direct marketing, as the advertising product, by its nature, takes time to reach consumers. Time is often equated with money in business, and the time ratio in direct marketing is a disadvantage. 5. Laws - The distribution of fliers and street advertising is often prohibited by law in certain areas. This is a major disadvantage of this form of direct marketing as certain customer bases will be unreachable. If a marketer wishes to reach customers, for instance, in a high-traffic and wealthy area, this may be impossible using direct marketing of this kind. 6. Limited Reach - There is an inherently limited geographic reach to direct marketing involving fliers and street advertising. By using this form of direct marketing, you will be limited to consumers in a very specific distribution area and will have to depend on word of mouth for others.
Asked in Jobs & Education, Calculus
What is the indefinite integral of 2x ln2x dx?
In order to work out this problem, we need to learn how to apply the integration method correctly. The given expression is ∫ 2xln(2x) dx. Instead of working out with 2x's, we let u = 2x. Then, du = 2 dx or du/2 = dx. This method is both valid and easy to avoid working out with too much expressions. You should get: ∫ uln(u) (du/2) = ½ ∫ uln(u) du Use integration by parts, which states that: ∫ f(dg) = fg - ∫ g(df) We let: f = ln(u). Then, df = 1/u du dg = u du. Then, g = ∫ u du = ½u² Using these substitutions, we now have: ½(½u²ln(u) - ½∫ u du) = ¼(u²ln(u) - ∫ u du) Finally, by integration, we obtain: ¼ * (u²ln(u) - ½u²) + c = 1/8 * (2u²ln(u) - u²) + c = 1/8 * (2(2x)²ln(u) - (2x)²) + c = 1/8 * (2x)² * (2ln(u) - 1) + c = ½ * x² * (2ln(2x - 1)) + c