Estimate Definition and 350 Threads

Hi, I need to resit some exams and I'v been having difficulty trying to solve this problem. Estimate the velocity and angular velocity of an empty pipe of mass (m)=1000kg, Diameter (d)=10mm, shell thickness (h)=1mm at the bottom of a slope of angle \theta=45^{}o and path length L=5000mm on...

Hello Folks, How would I estimate the energy required for machine parts, such as turning a valve? we're talking joules? aye? could i estimate it fairly accurate? any help as to what equations and tools i would use? im basically wanting to measure the efficiency of a machine... the energy put...

A block is at rest. The block is macroscopic so we can see that it is at rest and where it is, i.e. we know its position with certainty. Suppose we use the Heisenberg Uncertainty Principle to estimate the position uncertainty Δ x. Consider the following argument: Since the engine is at rest...

explain why an estimate of intergal(f(x)) from 0 to .5 using the first 2 nonzero terms of its taylor approximation differs from the actual value of this integral by less than 1/200

The laser is able to vaporize an Earth sized planet in about a second.

Hi :smile: I really need a answer to this task. Hope anyone can help. A curling stone ( named A ) gets on the ice with a unknown beginning velocity Vo the stone moves along a straight line ( x-axis ) on the x-axis further ahead lies another stone ( named B ) still. Stone A collides with...

Guys, I have a solar panel screwed onto a shaft which connects directly to a servo motor shaft. How much should the torque rating of the servo be to be able to rotate it ? I mean an estimate of the minimum torque required. The panel weighs 0.8kg plus a few grams for the solar panel holder (made...

in need of help for how to do this question given probability mass function: x 1 2 3 4 p(x) 1/4(θ+2) 1/4(θ) 1/4(1-θ) 1/4(1-θ) Marbles 1=green 2=blue 3=red 4=white For 3839 randomly picked marbles green=1997 blue=32 red=906...

A human hair is about 100 μm across. Estimate the number of hairs in a typical braid. The average number of hairs on a person’s head = 100,000, and the answer is supposed to be 10,000. Can someone explain how you would get 10,000? Thanks in advance

Hi all, I am just a mechanical engineer with no good background of nuclear physics. As I am doing some research on how much each country can posses nuclear bomb. The question is if I know the reactor location (approximate) , type of reactor and its Rated power (MWe) with assumed plant...

Suppose we had the technology to produce artificial diamond beams and carbon nanotube rope cheaply enough to use in large quantities. If we use the diamond for compressive load, and the CNT ropes for tensile load, how tall a skyscraper could we build using these materials, in theory? Is there...

Homework Statement Find the smallest integer n that ensures that the partial sum s_n approximates the sum s of the series with error less than 0.001 in absoulute value. \sum_{n=1}^\infty (-1)^{(n+1)}\frac{n}{2^n} Homework Equations {\abs{s-s_n}} <= s_{(n+1)} = a_{(n+1)}...

I read this question online. Estimate the length of your ear canal. Regard the canal as a narrow tube that is open at one end and closed at the other, at approximately what fundamental frequency would you expect you hearing to be most sensitive? Explain why you can hear especially soft sounds...

First, I want to understand something. Everything I look at suggests that the ionization energy of an atom or ion is suppose to be the energy needed to remove the 'outermost electron'- which I find troubling conceptually, since they also refer to this as the one with the highest energy. Wouldn't...

Homework Statement A ski tow is operated on a 20 degree slope of lenth 300m. The rope moves at 12.0km/h, and power is provided for 70 riders at one time with an average mass per rider of 65kg. Estimate the power required to operate the tow. Homework Equations P = Work / t P = F * v...

Homework Statement A thunderstorm drops half an inch of rain (approximately .01m) of rain which covers an area of about 70 miles (approximately 10^8 m^2).Estimate the number of raindrops that fell during the storm. Homework Equations Area of a sphere,the raindrop= (4/3)(pi)(r^3) The...

General interiors of my house need a complete renovation regarding mirrored closet door & window casing, suspended acoustic ceilings, walls (i.e. insulation, vapour, barrier, drywall, tape) and retro fitment of central vacuum. Please suggest any website that caters online help in calculation of...

I've been trying to figure out this paper by W. Smilga: Spin foams, causal links, and geometry-induced interactions I don't have the knowledge and background to be able to determine whether his derivation of an estimate to the fine structure constant is interesting, or just a trick. I am...

Hey guys I was just taking a look at a sample exam and I came across this, with no recollection of ever learning it. I don't really want anyone to solve a problem for me per se, I just want an explanation for what is being asked. So anyway, I am asked to find the linear estimate for a...

Let A be a matrix with real elements. The problem is to estimate eigenvalues of A, real and complex. QR algorithm is fine for real eigenvalues, but obviously fails to converge on complex eigenvalues... So, I'm looking for an alternative that could provide an estimate for complex eigenvalues of...

I need a method for estimating the liquid flow rate required by a gas scrubber (I know the amount of gas that needs to be scrubbed and the amount of particulates with it, but I don't know about the nature of the particles, except that they are organic). It doesn't need to be particularly...

Homework Statement How many terms of the series infinity E n =1 1/(1+n^2) must be added to estimate the sum within 0.01? Homework Equations The Attempt at a Solution need help please. Also, the answer i believe it 100 terms. However i need to show work to support this answer.

Hi I just had a question on a quiz that asked to estimate the hypotenuse of triangle with given sides and a maximum error possibility. The two given sides were 5 and 12..i don't need an exact solution..but I was just wondering how to do it. I Found the maximum Error that was possible and the...

What is the most accurate way to estimate the surface area of a cylindrical bottle that decreases in diameter from its wides point (the body) to the narrowest point ( the neck and cap)? It seems like we did similar problems in calculus, however: 1. I don't remember any of it, and 2. I think...

Question: When you walk with a cup of coffee (diameter 8cm) at just the right pace of about 1 step per second, the coffee sloshes more and more until eventually it starts to spill over the top. Estimate the speed of the waves of the coffee. Relevant Formulae: f= 1/T v= f * wavelength...

A hydrogen atom (with Bohr radius of half an angstrom) is situated between 2 metal places 1 mm apart which are connected topoosite terminals of a 500 V battery. What fraction of the atomic radius does the separation distance d amount to, roughly? Estimate the voltage you need with this...

http://arxiv.org/abs/astro-ph/0602519 Authors: H. Balasin, D. Grumiller Comments: 11 pages revtex4, 4 eps figures Report-no: LU-ITP 2006/002 Exact stationary axially symmetric solutions of the 4D Einstein equations with co-rotating pressureless perfect fluid sources are studied. This is of...

Hello, I am working on an integral-equation problem in the field of electromagnetics, which gives me a very large linear system that needs to be solved. I use a fairly recent method for this, namely the fast multipole method, which allows me to calculate a matrix-vector product in a fast way...

Well the question asked us to make a rough estimate of the temperature of the filament in an ordinary electric light bulb which emits white light. And if it has radiated power of 100 W, make a rough estimate of the surface area of filament. Well, the thing is how u make a rough estimation on...

Hello. Often high temperature data are not available. I am missing the melting heat of many coumpounds. However, rather precise binary phase diagrams are available. (my examples deal with silicates, say CaO-SiO2 for example, http://www.npl.co.uk/mtdata/demo/dgox1.html) I would like to...

I have some first order differential equations. I have found the steady state response for each equation. However, now I need to estimate how long it will take to reach steady state. Can anyone tell me the formula for that or get me started on how i go about doing this. I'm not finding...

hi all! I have the following problem (in reality I study objects which may be perfectly described by "fishes" as below): [SIZE="3"]Fishes in the pond: There are N fishes (x of blue color and y of red color) in the pond. N>>10^5, x+y=N, x>>y Each fish has a weight w - positive numerical...

Hi guys, I've been having trouble with this problem and would appreciate just some direction to assist me. I have to estimate the motion of Pluto in "/hour from observations given that the telescope is a 14inch f/11 with an AP7 CCD camera with pixels 24microns on a side. Now we have two...

Hi, My question: A homemade capacitor is assembled by placing two 9-in pie pans 5cm apart and connecting them to the opposite terminals of 9-V batter. Estimate the capacitance? I know that to get the capacitance, you can use C=Q/V or C=keA/d. Do I need to find the area of the two pie pans...

Researchers of a department of engineering of fish are studying the fish of a lake. In the first phase of the work they collect 100 fish, place labels in all they and they return them to the lake. One week later them they come back to the lake, they collect more 100 fish and they observe that 7...

Okay, well, perhaps I am already done, perhaps not. This is why I seek your wisdom :) If you are asked to find the first 5 terms of the expansion (1 + 0.07)^9 using the Binomial Theorem, and then asked to use these terms to estimate the value of 1.07^9 what would you put? I added the 5...

I need to read through this a few more times before I really "get it" but it will be of general interest. After one read-through, it looks like the effects of methane on climate have been underestimated in the past because this gas was measured in the atmosphere after it has mixed with other...

Suppose you are conducting a hypothesis test to compare two sample means from independent samples, with the variance unknown, but you know it is the same for both populations. Then you use the pooled estimate of the variance given by [ (n1 - 1)s1^2 + (n2-1)s2^2 ] / (n1+n2-2) I was just...

Hello! here is one question which I still donno how to solve: A thunder cloud with a large flat square base measuring 3000m x 3000m passes over an area on level ground. Assuming the cloud carries a total charge of 40C which is spread evenly over its base and is at a height of 0.5 km above the...

Estimate the area under the graph of f(x) =x^2 + 4x from x=1 to x=9 using 4 approximating rectangles and left endpoints. first i had to find delta x, so i did 9-1/4 = 2 which means x0 = 0, x1 = 2, x2= 4, x3=6 (since I'm using left endpoints, i include x0) after that, i just plug it in...

hi! title tells all

Four positive numbers, each less than 50, are rounded to the first decimal place and then multiplied together. Use differentials to estimate the maximum possible error in the computed product that might result from the rounding. I took f(w,x,y,z) = wxzy and then you set df=xzy(dw)+wzy(dx) etc...

Kinematics Problem. How do I get T to solve for V(i). PLEASE HELP 9.Superman is supposed to leap tall buildings in a single bound. Suppose that he obeys the normal laws of physics in this feat. Estimate how fast he should be moving when he leaves the ground so that he just clears the top of...

Francesca, who likes physics experiments, dangles her watch from a thin piece of string while the jetliner she is in takes off from Dulles Airport. (see pic. attached) She notices that the string makes an angle of 20° with respect to the vertical while the aircraft accelerates for takeoff, which...

it is nice and quiet down here in the basement

What is the estimate of the gravitron size and can someone explain why it must be spin 2 also what is the higgs boson it is expected to be massive, electrically neutral, and spinless. why. Cheers Woody

Does anybody have a reasonable estimate of the following, If the Concorde was flying at 6000 ft at velocity of sound ,and it's engines cut out , how long would it take to reach the ground doing the best it could to delay the inevitable ? I've seen answers ranging from <1min to > 7 mins . Ray.

Here's a verbatim section of the problem: " The source contains carbon isotopes of mass numbers 12, 13, 14 from a long-dead piece of a tree. (To estimate atomic masses, multiply by 1.67x10^-27kg). " My question is isn't the 12, 13, & 14 in the atomic mass units already (Carbon-12 has an amu...

Can someone help me get started on this question?: In a Diesel engine, atmospheric air is quickly compressed to about 1/20 of its original volume. Estimate the temperature of the air after compresion and explain why a Diesel engine does not require spark plugs. What equation would be...

The other thread asks about life in the universe. How about the [correct application of Drake's equation] number of planets in the galaxy that support intelligent life?