In class, we briefly discussed those experiments where a paper cup is filled with water and heated, and the cup does not end up burning while the water is able to boil.
From what I remember of what was said, although I am not sure I understood correctly, the water has a much higher specific...
I am working on some simulations to determine pressures for extremely high-pressure combustion events. The temperatures in these events can range anywhere from 3000 K to 6000 K. In order to do this I need to find valuers for specific heats of gases at these temp ranges as I know they vary to a...
So, I converted the V (milk) to m3 and found 1.8E-4 m3 and i already know the density so i found the mass of the milk in the bottle.
Mmilk= 1.9E-7 kg
Normally i would try to connect it with the formulas above but i dont know temperature. I am not sure how i can connect the dots.
Can someone...
Homework Statement
A monoatomic ideal gas undergoes a linear process whose equation is given by P/po+V/vo=1. find the volume when the process turns from an exothermic to an endothermic one. P-Pressure V-volume
Po= pressure when volume is nearly 0 and Vo is the volume when pressure is...
Homework Statement
Consider the dissolution of CaCl2.
CaCl2(s) Ca2+(aq) + 2 Cl-(aq) ΔH = -81.5 kJ
A 10.6-g sample of CaCl2 is dissolved in 109 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming...
1. The problem
What is the resultant temperature when 100g of steam at 100°C is passed through 500g of ice at -20°C.
Homework Equations
Q=mCDeltaT[/B]
The Attempt at a Solution
I am not sure whether both the quantities will combine to from water
Homework Statement
So I'm doing an experiment at uni which I have to find out the specific heat capacity of given small solid cylinder. We are given an insulated canister(a dewar flask) standing on a scale where we have to pour Liquid Nitrogen(hereafter will be refered as LN2) in. A cork with...
Hello, I tried attempting the following example problem 11.1(please see below), however I don't quite get from where they got cp=1.00 and cv=0.717?
I know that Q=m*cp*delta T=> cp=Q/(m*delta T)
Q=n*cv*delta T=>cv=Q/(n*deltaT)
Problem statement
Their solution:
How did...
Hi,
I want to simulate a forced convection cooling problem. Air at ambient temperature is forced through a fan into a system to cool electronics and I would like to assess the temperature of the outlet air. Actually I'm interested in the delta between the ambient and outlet temperature. This...
Homework Statement
Imagine I have a 3.5 kg brick at 80 °C that I put in 10l of water at 20 °C. What will the final temperature of the water be?
SHC brick = 840 J kg-1 °C -1
Homework Equations
E = mc∆θ
The Attempt at a Solution
First I calculated the energy available from the brick to heat...
Homework Statement
"A well-insulated bucket of negligible heat capacity contains 120 g of ice at 0°C. If 20 g of steam at 100°C is injected into the bucket, what is the final equilibrium temperature of the system?"
Homework Equations
$$Q_{fus} = m_{water}L_{fus}$$
$$Q_{vap} =...
Homework Statement
Body X whose temperature is 0 °C is brought into thermal contact with body Y of equal mass and temperature 100 °C. The only exchanges of heat that take place are between X and Y. The specific heat capacity of X is greater than that of Y. Which statement about the final...
Hello. I am doing a research paper on the relationship of specific heat capacity and refractive index of liquids. I am doing this by finding the relationship between specific heat capacity and concentration and refractive index and concentration. With this I can find a general trend and conclude...
Homework Statement
My answer is question 3 part c the graph. SHC = c
http://www.ocr.org.uk/Images/61757-question-paper-unit-g484-the-newtonian-world.pdf [See page 7]
Homework Equations
E=mcdelta theta Power=Energy/Time Therfroe
Power*Time = Mass*c*delta theta.
The Attempt at a Solution
See...
So I have a question regarding the specific heat capacities in thermodynamics. In general the specific heat capacities for a gas (or gas mixture in thermo-chemical equilibrium) can be expressed as,
## c_p = \left(\frac{\partial h}{\partial T}\right)_p \qquad \text{and} \qquad c_v=...
Hello! I understand what specific heats are and how to derive them. I just feel that I'm missing a little something in the methodology.
Consider the 1st law of thermodynamics and the definition of enthalpy:
1) dU = δQ -δW = δQ - PdV
2) H = Q - VP
For the derivation of CV, dV = 0 and the...
Homework Statement
earlier today i was doing some coursework to find the specific heat capacity of an unknown metal by submersing 100g / 0.1kg of the metal in boiling water above 75°C and record the temperature after 30 seconds (θm).
we then had to transfer the the metal from the boiling water...
Homework Statement
In a 30% efficient, -16°C fridge, how much electrical energy will be used up to lower the temperature of 250 mL of 75°C water? If the fridge is rated at 150 W, how long will this process take?
Specific Heat Capacity of Water = 4200 J/Kg×K
Specific Heat Capacity of Ice = 2000...
Hi,
I am doing an experiment on the factors affecting the time to heat water from a set temperature to another, eg 20 to 35 deg C.
1. First, I have insulated the beaker properly, to minimise heat loss. I have connected a heating element to heat the water. Connected multimeter, give the voltage...
I recently encountered this problem in class
"A glass pot of mass 0.6kg contains 1.2kg of oil at 15 degrees Celsius. If 214kJ of energy is supplied to it, what is the final temperature of the pot and oil? ( The specific heat capacity of glass is 700 J kg-1 °C-1, and the specific heat capacity of...
Homework Statement
A water of mass 300g has been poured into a glass of mass 100g (of specific heat capacity 970Jkg-1°C-1) in a refrigerator. How much energy must be removed to cool the liquid and the glass from 30°C to 7°C?
Homework Equations
c = Q/mΔT
The Attempt at a Solution
mwater =...
Homework Statement
mass, m, of water in kettle
1.5 kg
power rating, P, of kettle
2.1 kW
time interval, t, for heating
322 seconds
starting temperature
4 °C = 277 K
finishing temperature
100 °C = 373 K
temperature change, ΔT
96 K
electrical energy supplied, E = P × t...
Homework Statement
A 3.50-kg block of iron initially at 8.00 × 10^2 K is placed on top of a 6.25-kg block of copper initially at 4.00 × 10^2 K. Assume the blocks are thermally insulated from their surroundings but not from each other and that they constitute a closed system.
How much energy is...
Homework Statement
So I've been trying to find the specific heat capacity of the potato for a while and keep coming up with an outrageous number (over 700,000 J/kgC)
Here's what I've found
mass of potato = 0.15kg
initial T of potato = 18 degrees C
final T of potato = 83 degrees C (is this not...
1) PROBLEM:
Task is to find the thermal conductivity of steel experimentally.
I have conducted relevant experiments and I am trying to solve for the thermal conductivity (k) itself. My final however is ten times too large in size, and I am having trouble identifying where the error is coming...