Calculation Definition and 1000 Threads

Good afternoon! Please help me figure out the mathematics of this simple plane wave question! 1. Homework Statement 2. Homework Equations n1*sin(theta1)=n2*sin(theta2) The Attempt at a Solution I need help calculating the angle of incidence. I found the propagation vector for incidence...

I am an engineer who needs to help my chemical transport girl friend with a little basic physics. It has been about 35 years since basic physics for me so I am rusty. She wants to understand how to calculate the following: She drives a large tanker (cylindrical) which carries a variety of...

Homework Statement - How many grams of NaCl (molecular weight = 58 Da) would you have to dissolve in 50ml to make a 2M stock solution? The Attempt at a Solution I have thought about simply multiplying 58 by 0.1 = 5.8 g, but am not sure if this is correct. It's just the daltons that are...

Homework Statement We are asked to calculate the comparison rate of an offset loan. Loan amount = $735000 Offset amount = $100000 Original term length = 300 months Offset term length = 254 months Original repayments = $4228.50 Adjusted Repayments (for comparison rate) = $4224.57 Total amount =...

Homework Statement R1= 9 Ohms R2= 17 Ohms R3= 18 Ohms what is the total resistance of this arrangement? Express answer in ohms, correct to one decimal place. Homework Equations I used the Parallel circuit formula 1/r1 + r2 + r3 The Attempt at a Solution I got 4.0 Ohms, apparently, it is...

Homework Statement Hello! This is actually a computational-statistics problem in data analysis, and I got a bit stuck. I have several events from a Monte Carlo simulation from 2 particles collision and for each event I have the primary vertex and the tracks associated to it. I wrote an...

The title says it all. I would like to know how to calculate the time for boiling water to cool off. Assuming the temperature of the room is not changing and there is a constant degree of air flow over the water. Really I would just like to know how to go about calculating this. Thanks in...

Hello. I fail to follow one step in the process of calculating ⟨la∥Y(L)∥lb⟩ . The spherical harmonics Yma(L)(r) represent the 2L+1 components of the spherical tensor of rank L. Writing the Eckart-Wigner th. for M = 0 yields: (1) Also one can write (2) Coupling L and lb to l: (3) Thus...

Trying to figure out how many particles would bombard an astronaut during a solar proton event. Given that the most possible is around 43,000 particle flux units (pfu) according to NASA. First calculating steradians, assuming a person is 1m^2, 1/(1E9)^2=1E-18. My calculation yields (43000...

Hi all, I'm trying to calculate the daily solar insolation (integrated solar irradiances from sunrise to sunset) for a given location and day of the year. For latitude 43.2° and April 15th, I get: H0 = (solar constant * scale factor for intra annual variation of sun-earth distance * 86400...

Homework Statement I would like to understand whether reocurring formulas in the example solutions to my homework problems hold in general and ideally where they're derived from. (I'm new here; if there's there a way to embed formulas in f.i. latex code please tell me.) As an example problem...

Hi all, According to the sunrise equation, the hour angle of the sun at sunset is: cos H = -tan(a)tan(d) where H = the hour angle, a = latitude and d = solar declination angle. This equation says that H at sunset = -H at sunrise. Now, I have a few questions concerning that: 1) I was...

I have a rigid body pendulum that is used to strike an object at the bottom of its swing. Ultimately I would like to know how much forced is the object being struck with. Could I do this with just knowing the velocity of the weight? I was thinking then I could get P=MV. Can someone please help e...

Hello, please do somebody have some experiences with calculating of stellar reddening via interstellar extinction? I made some calculation based on apparent and absolute magnitudes and distances of brigthtness star but maximum Av which I got for Betelgeuse was 1.12 mag ( for its maximum apparent...

I would like to find the power loss over 0.3 seconds due to a resistance of 0.0015 ohms with a current following the function: I = e-15.24t-e-39984.75t where t is time. I would have imagined summing all the current over that 0.3 second period via integration would then allow me to find...

I am new and have a math and finance background. Because of my work I am starting to get into engineering related questions, specifically in piping. I flyfish a lot and can give pointers to anyone that helps me with my questions. Say I have a 5-10' length of pvc, metal or copper pipe that is 4...

Homework Statement The car circulates on a section of road whose profile can be approximated by a sinusoidal curve with the wavelength of 5.0 m. The mass of the car is 600.0 kg, and each wheel is equipped with a constant spring k = 5000 Nm-1 and a damper with constant b = 450 Nm-1s. Calculate...

Homework Statement For this shape , it's clear that the centroid and the horizontal line of equal axis lies on the same horizontal line , am i right ? Homework EquationsThe Attempt at a Solution I'm not sure . correct me if i am wrong . [/B]

Hi, I am new to the use of forums and have no experience in airflow but I was looking for some help with the calculation of the gas flow through the main stack of a cement plant, the measurements I have at the moment are as follows Velocity= 12.5m/s Temperature= 120°C Differential pressure=...

Hello All I am designing some very basic components for a motorcycle project at home, and because I am interested, thought I'd use it as an opportunity to refresh my memory in order to reduce the risk of the parts failing. To begin, I want to do some basic hand calcs if possible so have...

Hey, First I want to find the electric field strength from the middle between two point charges q1 = 8nC and q2 = -6nC. The distance between the two charges is 10 cm. Then i want to find out at which point of a straight line, which runs through the two charges is the electric field strength...

Homework Statement Hi guys, I have the following transmitted power signal: $$x(t)=\alpha_m \ cos[2\pi(f_c+f_m)t+\phi_m],$$ where: ##\alpha_m=constant, \ \ f_c,f_m: frequencies, \ \ \theta_m: initial \ phase.## The multipath channel is: $$h(t)=\sum_{l=1}^L \sqrt{g_l} \ \delta(t-\tau_l).$$...

Hey guys, The following thing got me a little bit messed up. I want to calculate the orbital radii of an Hydrogen atom if the angular velocity of the electron is 10^16 * s^-1. At first i set the centripetal force and the electrostatic force as equals. ( m * v^2 )/ r =k * (e^2) /...

Problem: Evaluate lim(x->0) x cotx My attempt: lim(x->0) x cotx = lim(x->0) x cosx / sinx = lim(x->0) cosx * lim(x->0) x / sinx = 1 * lim(x->0) x / sinx = lim(x->0) x / sinx P.S. I know I must/can use L'Hopital's rule to evaluate indeterminate limits, but no matter how many times I derive...

1. A hydraulic cylinder equipped with a helical coil compression spring(figure is attached). The oil pressure acts the spring and moves the boom from position 1 to position 2. Maximum boom load in position 1 F1max= 16550N Minimum boom load in position 2 F2min = 18550N cylinder load...

I'm trying to come up with a lightweight solenoid linear actuator, by constructing two electromagnets that telescope. The outer coil would be wrapped around a soda straw, and the inner coil would fit inside the soda straw and be wrapped around something smaller, like a bamboo skewer (which also...

Hello all, I want to know a suitable way to calculate VTL and VTH of a gate having the gate schematic and constituent transistors SPICE model (NMOS/PMOS models). Is there an easier than doing hand calculations ?

Homework Statement Homework EquationsThe Attempt at a Solution I didnt understand much the question. Should I use, ##υ=εE^2## ? Then I ll take rms value of that E.But I am not sure that is that the max value.Is it max value ? I didnt understand part (B)

I recently read a question. It was: If 100 birds are sitting in a circle and all of them peck a bird either on their left or on their right randomly, what's the expected number of birds that will be unpecked? The answer to this is 25 birds as probability of not being pecked is 25%. The logic...

Hello PF, I have a question. I would like to know how many gallons per hour are leaking from a residential hot water system. Here are the parameters: House PSI or H2O pressure=100 psi. Hot water pipe size=3/4” copper. Temperature of piping that is approx. 10’ away from the water...

I want to calculate the pressure profile inside a cylinder whose initial pressure is less than the outside pressure and has a orifice on its surface to flow air through it. Air is a considered as compressible ideal gas and mass flow rate across a orifice is assumed isentropic. Also the...

Hello, I'm working on an electron gun and I am wondering if there is a way to calculate the temperature of the hot cathode, from it's thickness, resistance, the amount of current running through it, or other relevant factors. This is part of an attempt to calculate the energy of the emittted...

Homework Statement Homework EquationsThe Attempt at a Solution Why does the second term become zero??

I cannot understand the the relation between Reynolds Transport Theorem and Volume Calculation. Volume calculation is an simple, straightforward process which, I think, have much connection between Reynolds Transport Theorem. We calculate volumes in thermodynamics, heat transfer and fluid...

Homework Statement Hi, I have the following task: We have two conformers and the difference in energy between them is aprox. 1 Kcal/mol. What is the Keq at room temperature vs. at -78°C? Homework Equations Keq=e^(deltaG/(-R*T))The Attempt at a Solution I tried to solve the problem the...

Homework Statement 300 kPa pressure and v=0.5 m3/kg. The state is fixed. I should find the temperature and quality if defined. Table values for temperature T P vf vfg vg 130C 270.1kPa 0.001070...

I'm new to mcnp and trying to perform this calculation, if anyone can provide some feedback to see if I'm even going in the right direction that would be much appreciated. The geometry is correct with only 1 transverse, the issue I am having is making sure my data block is correct and how I am...

I have marked this as high school level, although I am studying an undergraduate general relativity course, and just want to get some basics right. Whenever I look for a 'cheap and dirty' method of calculation for the age of the universe, with a Hubble constant not changing with time, I am met...

Homework Statement Calculate the voltage U. The voltmeter gives a value of 80V. The Attempt at a Solution [/B] 3RI + 4RI - U = -80 How can I create a System of Linear equations if I have only one equation? Do I miss something? My answer sheet says U = 150V.

Homework Statement [/B] Im working through my HNC with the answers but i do not know how they have come to the numbers below.Total load = 1.5/-60 degrees + 2.3/-18 degrees. =(0.75−j1.3)+(2.19−j0.71) 2. Homework Equations . Not sure yetThe Attempt at a Solution I understand how they have...

Voltdrop calculations are made as shown below. Total loadLine currentI=1.5/−60∘⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯+2.3/−18∘⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ =(0.75−j1.3)+(2.19−j0.71) <<< (How to get to these numbers only from above??) =(2.94−j2.01 )=3.56/−34.4∘⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯MVA

Homework Statement We have an ammeter with 20Ω resistance and a range of 10mA or 0.01A. The different ranges are 3000mA, 300mA, 30mA. Calculate the shunt resistors a, b and c. Homework Equations The Attempt at a Solution Ia = 0.01A ; Ra = 20Ω ; I = 0.03A Ua = Ia ⋅ Ra = 0.01A ⋅ 20Ω =...

Hello! And Good day! I just want to ask why do I keep getting a negative value whenever I take a definite integral of function $$y=-50e^{-5x}$$ the graph is shown as the first image. If you look at the graph of the integral of "y" there's no traceable negative value on the graph. Why is that...

Homework Statement [/B] An ammeter has a range of 10mA or 0.01A and a resistor of 20Ω. Three shunts are used: R1 = 4Ω ; R2 = 2Ω ; R3 = 4Ω What will the different ranges be (m3, m2, m1)? The Attempt at a Solution [/B] I started by calculating the voltage: Ua = Ia ⋅ Ra Ua = 0.01A ⋅ 20Ω =...

Given this libreoffice command: HYPGEOM.DIST(X; NSample; Successes; NPopulation; Cumulative) >X is the number of results achieved in the random sample. >NSample is the size of the random sample. >Successes is the number of possible results in the total population. >NPopulation is the size...

Homework Statement Hello, I have a task to make a heat balance of the evaporator. To do this, I was told to carry a few smaller energy balances in different parts of the evaporator. One of the things I had to calculate was the heat generated during steam compression. -steam is entering...

Homework Statement I have several question regrading with this post . 1.) For BC and CB , we could see that it's far end pinned / roller supported , so , shouldn't be the K = (3/4)(EI / L ) ? 2.) I don't understand how the carry over factor works (in the second picture) Homework...

Hi guys... appreciate if somebody can help me on the design calculation of the RTG crane... I am stuck to understand the following formulas, used by MITSUBISHI to calculate as follow: 1. Moment of inertia for hoisting = [Lifting weight (kg) x Lifting velocity^2 (m/min)^2] / [π^2 x motor rpm^2]...

Hello all, i am having a hard time with EM, specially with the most simple concepts that i don't seem to grasp at all and the simple exercises that should be quite simple to solve. So the question is. ( i will omit the constant (1/4pieo) for practice sake When i calculate the eletric field...

I have a pump running at 400rpm with 8" inlet and outlet with head 30 ft 500 gpm. Now I am planning to reduce the discharge line to 6" . Assuming the flow rate and speed constant the velocity in the pipe will increase. How do I calculate the change in head?