Specific Definition and 1000 Threads

Homework Statement I was having this discussion, and a friend of mine asked if swallowing hot coffee would denature the enzymes of the stomach Homework Equations q= cg(Delta T) M=DV The Attempt at a Solution First thing I did was assume coffee to be around 140 deg F. I then made...

"Back of envelope calculations" for thurst, specific impulse, etc. I am working on a project that is really out of my realm of experience, so if you could give me some basics, that would be much appreciated. How do you determine the amount of thrust, power, etc. needed to travel a distance of...

What does ISE stand for and what is the difference between Specific & Selective ?

Hi guys! Pls help me in my Physics homework.. this is due on Friday, 7th Dec.:eek: i can't find anything in the internet, si i badly need your help Homework is regarding with:: [SIZE="4"]1.DENSITY AND SPECIFIC GRAVITY ---a.Scientists ---b.Principles and Theories 2.UNIFORMLY...

The mass of a gas molecule can be computed from its specific heat at constant volume c_v (note this is NOT C_v) Take c_v=0.075\frac{cal}{g*C} for argon and calculate (a) the mass of an argon atom and (b) the molar mass of argon. I just finshed the chapter on Kinetic Theory of gases, but...

Hi this is my first post and I'm stumped on my last HW problem, so I'm open to suggestions or solutions. 1. A jar of tea is placed in sunlight until it reaches an equilibrium temperature of 35°C. In an attempt to cool the liquid, which has a mass of 220 g, 112 g of ice at 0.0°C is added. At...

Homework Statement We give 70J as heat to a diatomic gas, which then expands at constant pressure. The gas molecules rotate but do not oscillate. By how much does the internal energy of the gas increase. Homework Equations The Attempt at a Solution I did it this way: Heat...

I'am in High School right now, and I'am still not really sure what job I would want to have. However, I do have several areas of interest. My favorite subject by far is math, which is closely followed by physics. I somewhat like chemistry, but I don't really like biology at all. I know about...

Homework Statement An insulated Thermos contains 127 cm3 of hot coffee at 79°. You put a 12.0 g ice cube at its melting point to cool the coffee. By how many degrees has your coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as though it were pure water and...

Homework Statement A metal container, which has a mass of 8.0 kg contains 14.3 kg of water. A 2.9-kg piece of the same metal, initially at a temperature of 190.0°C, is dropped into the water. The container and the water initially have a temperature of 15.1°C and the final temperature of the...

The system, originally at T_A = 21.0 Celsius, is placed in a freezer, where energy is removed from it in the form of heat at a constant rate. The figure shows how the temperature of the system takes t_1 = 10 min = 600 s to drop to 0 Celsius, after which the water freezes. Once the freezing is...

Homework Statement A 0.29 kg coffee mug is made from a material that has a specific heat capacity of 930 J/(kg·°C) and contains 0.23 kg of water. The cup and water are at 25°C. To make a cup of coffee, a small electric heater is immersed in the water and brings it to a boil in two minutes...

In an insulated container, 0.50 kg of water at 80 degrees C is mixed with 0.050 kg of ice at -5.0 degrees C. After a while, all the ice melts, leaving only the water. Find the final temperature T_f of the water. The freezing point of water is 0 degrees C...

Specific Heat...Please help! Homework Statement A metal container, which has a mass of 7.2 kg contains 14.7 kg of water. A 2.1-kg piece of the same metal, initially at a temperature of 200.0°C, is dropped into the water. The container and the water initially have a temperature of 14.3°C and...

Homework Statement need to work out the Specific Latent Heat of Fusion i did the experiment and here are the results Results: Mass of calorimeter Mcal 116.87g Mass of H2O MH2O = [Mcal + H2O] - Mcal 80.82g (197.69g) Mass of Ice Mice = [Mcal + Mice + H2O] - MH2O 12.58g (210.27g) Room...

ok so this is my first post and I am not sure if what I am looking for is even possiable or that I am even posting in the right form.. anyways im looking for a way to find the specific heat of a water sample depending on the hardness, i measure hardness with grains per gallon (gpg). and I am...

Homework Statement Give a specific example of an operator T on R^4 such that, 1. dim(nullT) = dim(rangeT) and 2. dim(the intersection of nullT and rangeT) = 1 The attempt at a solution I know that dim(R^4) = dim(nullT) + dim(rangeT) = 4, so dim(nullT) = dim(rangeT) = 2. I also...

I have a cantilever with one fixed end and a point force on the other end. The cantilever beam itself is a perfect rectangular prism. We used a strain gage to measure the strain values, so how would I calculate the point force? I know the value for Young's Modulus of the cantilever used. Any...

Homework Statement A mixture of gases containing 10 kg of nitrogen, 10 kg of hydrogen, and 15 kg of helium is contained at a pressure of 6.7 MPa and a temperature of 300 K. If the constituents are taken to be perfect gases and the Gibbs-Dalton law holds, what are the molecular weight and...

Easy Question but can't seem to make head way on this one! For the Function shown in the link below find and plot f(2 -t/2) http://www.imagedump.com/index.cgi?pick=get&tp=516020

Hello, I'm really having trouble figuring out the specific heat capacity of solid NaOH. Any help is apprieciated. Thanks

For the following calculation, would the uncertainty propagate as I have estimated? \frac{\left(a \pm \Delta a \right) + \left(b \pm \Delta b \right)}{\left(c \pm \Delta c \right) \cdot \left(d \pm \Delta d \right)} = \frac{a+b}{cd} \pm \frac{a+b}{cd} \left( \frac{\Delta a + \Delta b}{a +...

Homework Statement How do you calculate the probability of measuring a specific energy value of a particle (eg. what's the prob that you'll measure exactly E=h^2/8ml^2 in a given particle)? The Attempt at a Solution When I saw the word probability, I just thought: Probability=Integral(psi*...

I am having fundamental difficulty in feeling the definition of specific intensity of a radiation field... questions: 1) Define a radiation field as precisely as possible. 2) Specific intensity defined at a point should remain the same whichever way we choose for the differential surface...

Homework Statement I have a circular vacuum cup. The cup has a diameter of 4.5 inches. I need to calculate the amount of pressure, in inches of mercury (Hg), that the vacuum created by the cup would have to be in order to generate 120 pounds of force on a flat object. Homework Equations...

Hi, I have an interest (for simple game physics) in basic equations like the trajectory of a projectile and catenary physics. Is there a specific grouping for these types of equations so that I can find similar ones easier? I'd like to be able to just find some and experiment with them to see...

Homework Statement an aluminum calorimeter with a mass of 100g contains 250g of water. THe calorimeter and water are in thermal equilibrium at 10 degrees celcius. Two metallic blocks are placed into the water. One is copper of 50g at 80celcius. The other is block is 70g and originally at...

Homework Statement I am unable to find the specific heat of certain substances. Examples of such substances are: Sucrose, Citric Acid, and Trinitrotoluene. I need one source for the information in this data, and I am unable to obtain it using a search engine. Is there anyone who actually...

Homework Statement I'm having trouble with the following two problems: 1. A jar of tea is placed in the sunlight until it reaches an equilibrium temperature of 32*C. In an attempt to cool the liquid, which has a mass of .180kg, .112 kg of ice at 0*C is added. At the time at which the...

Homework Statement From Q=m*Cp*(change in temperature), they give me all but Cp, which I calculate, and they also give me a mass per mole of the substance. Now the next part of the problem asks for the molar specific heat of the substance, but the equation for this eludes me. Homework...

If the total power per unit area from the Sun incident on a horizontal leaf is 9.00x10^2 W/m2, and we assume that 70.0% of this energy goes into heating the leaf, what would be the rate of temperature rise of the leaf? The specific heat of the leaf is 2.80 kJ/(kg°C), the leaf area is 7.00 x10^−3...

Homework Statement n_1 moles of a monatomic gas and n_2 moles of a diatomic gas are mixed together in a container. Derive an expression for the molar specific heat at constant volume of the mixture. My answer can only use the variables n_1 and n_2, and I'm assuming constants. Homework...

Homework Statement For a gas of molar mass M, Cp/Cv=y. Find specific heat at constant pressure. The Attempt at a Solution C_p=\frac{Pdv}{ndt}+C_v PV=nRT, P=constant \frac{P}{n} \frac{dv}{dt}=R Substituting in the above equation: C_p(\frac{y-1}{y})=R C_p=\frac{Ry}{y-1}...

Hi all, I am currently in the process of writing up my AS coursework investigation of finding the specific heat capacity of Aluminium, and am a bit stuck at explaining some of my results. My results for the SHC of Aluminium are lower than the published values. My value: 700.93 JKgC...

Hi ,please I need something to begin this problem: The specific heat s of a material in [J/(kg deg C] is the amount of energy in joules required to raise the temperature of 1[kg] of material by one degree C. The density ρ of a material in [kg/m3] is the mass in [kg] per cubic meter. If a...

Can someone give me the equation to calculate the change of Cv (specific heat at constant volume with change in temperature. For example the equation to do this with Cp (specific heat at constant pressure) is: Cp = 1.9327e-10*T^4 - 7.9999e-7*T^3 + 1.1407e-3*T^2 - 4.4890e-1*T + 1.0575e+3...

Is my assumption here true? Does having a higher specific heat capacity mean that the object will be a better conductor of heat?

Homework Statement My teacher instructed my class to conduct an experiment to determine the specific heat capacity of Brass, Copper, Aluminium, and Steel. The following setup was used: http://mypage.bluewin.ch/gutter/diagram1.JPG The following method was used: 1.) The electric heater...

Homework Statement The temperature of a brass cylinder of mass 100g was raised to 100 degree celsius and then transferred to a thin aluminium can of negligible heat capacity. The aluminium can contained 150g of paraffin at 11 degree celcius. If the final steady temperature after stirring was...

Explaining your reasoning, show that the ratio of the specifc heat is CP/CV = (DP/DV)s / (DP/DV)t hint :use TDS EQUATIONS I have used tds equation 3 and tds equation 1 and equated them,but i am stuck because i get to an equation like (CP/CV-1)(DT/DV)p = T(DP/DT)v and just do not...

help! need help here because my answers are different from the answer on the book. just wanted to make sure that i am right. these are the problems: 1. How much heat is needed tor aise the temperature by 10 deg celsius of 5 kg og a substance of specific heat capacity 300J/kg deg celsius? what...

Explaining your reasoning, show that the ratio of the specifc heat is CP/CV = (DP/DV)s / (DP/DV)t hint :use TDS EQUATIONS I have used tds equation 3 and tds equation 1 and equated them,but i am stuck because i get to an equation like (CP/CV-1)(DT/DV)p = T(DP/DT)v and just do...

given the major axis length, minor axis length, at the given angle THETA. what's the formula?

Hi. Does anyone know the specific package to installl SSH because i don't want to install all that other stuff

I am designing a cracking furnace to crack Ethylene Dichloride. the furnace is at around 500 C and 2 M Pa. To perform an energy balance I need the specific heat capacity of the EDC at the aforementioned temperature and pressure. I can only find it at standard conditions and can find no way of...

A pond of water at 0°C is covered with a layer of ice 4.50 cm thick. If the air temperature stays constant at -11.0°C, how much time does it take for the thickness of the ice to increase to 9.00 cm? Hint: To solve this problem, use the heat conduction equation, dQ/dt = kA delta T/x and...

I am a beginner in thermodynamics; all I know is how heat is transferred, rotational/translational/vibrational/internal energy, and the law of conservation of energy. I recently learned about specific heat capacity, and I was wondering: why is it that different substances convert varying ratios...

Hey all. I was wondering if anyone knows where I might find the specific heat of brass; I've googled and wikied with no success. Ah, whoa, hang on. It occurs to me that there might not be a standard "brass" alloy... bummer, confirmed by wiki. To rephrase the question then: Does anyone know...

Hi. Was wondering if anyone knew where i could find a list of the metals and their specific heat capacities. All i have found is this one: http://www.engineeringtoolbox.com/specific-heat-metals-d_152.html but i would like one that deals with all the metals Thanks

Homework Statement A sample of an unkown material weighs 200 N in air and 150 N when immersed in water. What is the specific gravity of this material? Homework Equations specific gravity = (density/density of water) density of water is 1000 kg/m^3 The Attempt at a Solution I...