Oil of Density 888kg/m^3 and viscosity 0.8Pa*s is flowing in a horizontal pipe of diameter 0.15m. The local flow velocity at the centerline is 10m/s. find the shear stress exerted by the oil on the wall of the pipe.
tau = -eta*(dv/dy)
roughly speaking I integrated the C_p function of Fe2O3 - hematite from 298 to 1200.
I really integrated it three times, because hematite has 3 states in this temperature range, and the C_p function for each state is different.
So I'm taking Thermodynamics I in university. I'm just doing the homework now, and there is something that i don't really understand.
To get the Enthalpy of formation for hematite (Fe2O3) at 1200K, I first integrated the constant pressure heat capacity function over the temperature range from...
^ number 2.
I don't get this problem. if the plastic sheets are non-conducting, does that mean the electric field can't penetrate the sheets? and how should i do this problem?
I don't get number 1 c, which equation do i use? and in general, how would I be able to find phi?
OK, i figured i should find the first derivative of the displacement formula, which becomes v = -Asin(wt + phi) but that still undoable, how...
number 3. For part d I'm finding the work by looking at the area under the graph, and a friend of mine used 1.5kdT, which also seems to make sense in this situation, but we're getting 2 different answers. For the change in internal energy...
What is the equation to find the change in heat of a system that is isothermal?
And also, for a PV graph, if the state of the system loops back onto itself, as in it starts at a and ends at a, is the total change in internal energy always 0?
First off, you must be in phys153 in UBC, because I got the exact same problems. For 1, you first find out the energy it took to boil all the water, and that's Lf*m. You then find find the power by dividing the energy you just found by the time. Since H measures the heat transfer for...
difficult problem, need URGENT help
A small pond has a layer of ice 1cm thick floating on its surface. (a) If the air
temperature is −10C, find the rate in cm per hour at which ice is added to the layer. The density of ice is 0.917g/cm3 and its thermal conductivity is 0.592 W/mK. (b) How long...
A 150g copper bowl contains 220g of water. Both bowl and water are at 20 degrees C. A very hot 300g copper cylinder is dropped into the water. This causes the water to boil, with 5g being converted to steam, and the final temperature of the entire system is 100 degrees C. a) how much heat is...
ya physics is like that sometimes. What helps me to grasp the points is to do problems, you don't have to do alot, just a little bit of every kind. and just try to scribble down some related stuff on paper while thinking about the concepts. I find that helps alot.
These are really parts of questions.
for number 2, I'm getting 264000kPa, but somehow it just doesn't seem rite, so if you guys can check for me, that'll be great. the other one i don't get is the second part of questions 4 where it...
A cubic metal box with sides of length 20cm contains air at pressure of 1atm and a temperature of 300K. The box is sealed so that the volume is constant and heated to 400K. What is the net force on each side of the box?
You see what I don't get is where all the numbers go, and what all the letters in the equation represent. I'm guessing for part A i need to setup 3 equations with 3 variables and R equalling 10.000, 13.946, and 24.174 ohms? and maybe with Tc equalling 0, 100, and 419.414 degrees C respectively?
another thermodynamics problem
For this one its a combination of the wording and the whole resistance that i don't get.
In the interval between the freezing point of water and 700 degrees C, a platinum resistance thermometer is used for interpolating the temperatures on the international...
I don't get what I'm supposed to do. We haven't even had one lecture on this. Am I to give a definite number value for the temperature? I did this : 0.2898cmK/0.107cm and got 2.7K, am I on the right track?
I got this question as part of an assignment. I read the section of the textbook that we were supposed to, and couldn't find anything to help me with, so here goes:
To measure temperatures, physicists and astronomers often use the variation of intensity of electromagnetic radiation emitted by...