Specific Definition and 1000 Threads

Homework Statement A ball is thrown vertically downward strikes a surface with a speed of 15m/s. It then bounces, and reaches a maximum height of 5 meters. Neglect air resistance on the ball. a) What is the speed of the ball immediately after it rebounds from the surface? b)What fraction...

Hi Everyone... I'm trying to calculate the specific gravity of a sample of LNG using a compostion certificate and temperature and pressure variables of 5 bar at -134 deg C saturated. Its do perform a check for the value used to calculate how much is charged per litre by converting density to...

Homework Statement Find the slope of the tangent line using a specific formula g(x)=3t-t2 at (0,0) Homework Equations Im told to use this equation by the book f(c+deltax) - f(c) Deltax The Attempt at a Solution Everytime i plug it in by way of the books style i...

Homework Statement The specific heat of a certain metal can be determined by measuring the temperature change that occurs when a piece of the metal is heated and then placed in an insulated container that is made of the same material and contains water. Suppose the piece of metal has a mass of...

Hi, I have a question about statistical mechanics. How do you calculate the density of states for phonons and electrons in a d-dimensional system (at fixed chemical potential) and when the dispersion relation for the electrons is E(p)=A |p|^g and for the phonons is w=v|p| To get the...

Hello, everyone. Homework Statement Now, I recently did an experiment in school to determine the Specific Heat Capacity of rubber using a calorimeter. We're using the mixing method to figure it out. The mass of the calorimeter, rubber and water was measured. And the S.H.C is already known...

Homework Statement Below about 80 K the heat capacity at constant volume for hydrogen gas (H2) is 3/2k per molecule, but at higher temperatures the heat capacity increases to 5/2k per molecule due to contributions from rotational energy states. Use these observations to estimate the distance...

Homework Statement Given circuit consists of two resistors ( R1 = 330 Ohm , R2 = 22K Ohm ) , an LED ( Forward voltage = 1.6V, forward current = 20 mA) , a BC 337 NPN transistor and a 9V battery supply. I need to find the total power consumed by the circuit for a run time of continuous 1...

Homework Statement a cu atom (mass number, 63;atomic number, 29) loses 2 electrons formed. for the ion formed calculate its specific charge in c\kg Homework Equations specific charge=charge\mass The Attempt at a Solutionss specific charge = (29x1.6x10-19)/(63x1.67x10-27) i...

Is it possible to find specific heat capacity given mass, initial and final temperature, and time? The liquid in question has not been given

Homework Statement 140 grams of boiling water (temperature 100° C, heat capacity 4.2 J/gram/K) are poured into an aluminum pan whose mass is 1100 grams and initial temperature 24° C (the heat capacity of aluminum is 0.9 J/gram/K). After a short time, what is the temperature of the water...

1. The tangential frictional force exerted by a band brakes on a rotating metal drum of circumference 0.25m is found to be 20N. If the mass of the drum is 0.4kg and its specific heat capacity is 0.35 kJ/kg K, calculate the number of complete revolutions of the drum are required to increase its...

Homework Statement A 34 g block of ice is cooled to -75°C. It is added to 562 g of water in an 80 g copper calorimeter at a temperature of 22°C. Find the final temperature. (The specific heat of copper is 387 J/kg ·°C and the specific heat of ice is 2090 J/kg ·°C. The latent heat of fusion...

Hello! How do I know which degrees grant me elegible to study a masters degree on a different study branch? For example, neuroscience, is it restricted to certain degrees? Or, is it possible to attend a special program to certify the credits needed for a particular specialization degree?

Homework Statement A certain substance has a mass per mole of 55 g/mol. When 284 J is added as heat to a 32.0 g sample of this material, its temperature rises from 22.0°C to 39.5°C And I know that the specific heat of this substance is 507.14 J/[kg(K)] Homework Equations Q =...

Homework Statement Beryllium has roughly one-half the specific heat of liquid water (H2O). Rank the quantities of energy input required to produce the following changes from the largest to the smallest. In your ranking, note any cases of equality. (Use only the symbols > or =, for example...

Homework Statement A 8.3 kg block of some unknown material is suspended from a spring scale and submerged in water. The spring scale reads 46.9 N. What is the specific gravity of the block? Homework Equations SG = density of object/density of reference material (water = 1000...

Homework Statement A circular coil with 35 turns of wire and a diameter of 19 cm is placed in a magnetic field given by B(t) = 6 t^2 + 6 t + 2 T where t is time in seconds. The field is perpendicular to the plane of the coil. What is the induced EMF at t = 5 s? Homework EquationsE=-d(magnetic...

Hi all, I'm reading through a section of my course about specific charge and I cannot figure out how exactly the example sum has got the answer it displays. It uses carbon 12 as the example so displays the sum as: = 9.61305876 x 10-19 ------------------------------------------...

Hi, Can someone please give me some suggestions on how to use a microwave oven to determine the specific heat capacity of tap water? This is not a homework question, but an assignment and I have absolutely no idea how I can do this.This experiment will be done at home, so please no immersion...

Homework Statement Is it possible to convert ml to grams for a Heat Capacity and Specific Heat type of problem? The problems that I have done so far did not use ml at all. I am stuck with the following problem: A piece of stainless steel (specific heat = 0.50 J g-1 oC-1 ) is taken from an...

When 13 grams of a sample cools from 56◦C to 34.4◦C it loses 25.8 Joules of heat. What is the specific heat of the sample? Answer in units of J/g ·◦ C. I know it seems simple, but I completely forgot how to do this. Please help.

Here is the situation, I have a Mollier Diagram(pressure-enthalpy diagram) for refrigerant R134. I had to draw a refrigeration cycle on the that find the specific volumes and enthalpies for each point. I read off the enthalpies at all 4 state points. Found the specific volumes for states 1 and 2...

Hello everyone, I'm a first year student currently majoring in math/secondary education. I've been researching different schools around my area because I have become really interested and set on switching to majoring in physics. Problem is, I want to have ,for myself, a more specific idea of...

hi, im have a few trouble working out this question, Calculate the ratio of charge/mass in Ckg-1 for the nucleus stated below 236 U 92 now i know the formula to use BUT I am having trouble with calculating the figures for Charge and Mass. (i know that the charge is...

Hello everyone, First post here so be kind :) I am working on a problem, that should be easy, but I just want to make sure my logic is correct. The problem is to find the probability of being dealt event A in a 5 card poker hand, where A = {2 pair and 1 card all of the same colour} Now I...

Homework Statement A basketball player shoots the ball at a height of 1.7m at an angle of 60 degrees into a hoop. The range is 10ft or 3.05m. The height from the ground to the top of the hoop is 10ft or 3.05m. What is the initial velocity m/s to make it to the hoop? Homework Equations...

Homework Statement Homework Equations i have a problem solving this foe my lab report..i just don't get the formula heres the data: ethylene glycol...its mass is 200 g ,initial temperature 22C, temperature after heated 100C what is its heat capcity? metal and water mass of...

The pKa for the dissociation of H3PO4 is 2.15. What is the concentration of H2PO4-1 (in M) at pH 3.21 if the original concentration of the phosphate was 2.37 M? My Attempt: Key Information: pH final: 3.21 Initial Molarity of phosphate: 2.37 M pKa: 2.15 I started with the first...

Homework Statement One mole of an ideal diatomic gas undergoes a transition from. a to c along the diagonal path What is the change in internal energy? Homework Equations The Attempt at a Solution I've tried to use the two other paths since the internal energy is the same both...

Hi, I don't remember how this came up, but I stumbled across a "wrong" solution to Einstein's field equations that involved a spinning universe and being able to see one's future. Does anyone know what I am thinking of?

Homework Statement "Water in a hydraulic press is subjected to a pressure of 4500 psia at 68 F. If the initial pressure is 15 psia, approximately what will be the percentage decrease in specific volume. Use Table 2.1 (below)." Homework Equations...

A sunken steel ship has a mass of 500,000 kg. It is filled with water. In order to lift the ship, air bags are to be inflated inside the hull. What volume of air is needed if 7.8 is the specific gravity of steel? A- 436 m^3 B- 2778 m^3 C- 1266 m^3 D- 872 m^3 E- 225 m^3 so since the...

Homework Statement A quantity of 100g of ice at 0°C and 50g steam at 100°C are added to a container that has 150g water at 30°C. What is the final temp of the container? Ignore the container itself in the calc. Homework Equations Q=mc (change in T) Q=mLThe Attempt at a Solution I know how to...

A is an open bounded set and its border is β. If a function f is known to have a constant unknown value k on this border β, what can we say about k if we know the value d of the following integral over the border β ? ∫((∂f)/(∂n))ds = d n being the exterior normal

Hi, I'm new to the forum, and I'm looking for input. I'm looking for a material that when it comes under pressure or is deformed, develops a magnetic or other resistant force that is released when the pressure is released and it is allowed to return to its original state. This could be on a...

i found the average specific heat of a metal through an experiment it is 200. my only problem now is identifying it. i have tried many website but can't find anything useful please make some suggestions

I understand the the specific heat capacity of a material is a function of temperature. Does anyone know of either a site (or reference) which has a large list of specific heat capacities for varying temperatures (large variety of temperatures is preferable to a large variety of materials)...

simple application please..o:)

I am creating a calculator and have 4 textboxes. I need to know what functions I need to delete the number '0' from a string of numbers such as, "0852" so it can look like "852." My goal is for the program to check the user input after the user has pressed the 'enter' button to go to the next...

I want to make a small spring piston to propel a 3 mm stainless steel ball to hit a target at a velocity of 15 m/s from just a few inches away. How can I calculate/determine the right spring to use?

can anybody tell me how the specific heat capacity varies with pressure and temperature for superheated vapors thanks

Homework Statement A system consists of N very weakly interacting particles at temperature T sufficiently high so that classical stat mech is applicable. Each particle has mass M and is free to perform one dimensional oscillations about its equilibrium position. Calculate the heat capacity...

I'm trying to get an equation to calculate how fast an automobile would be going to cover 500 feet if it takes the vehicle 8.9 seconds to go from 0 - 60 mph.

ASME y14.8M tells about the methods of making shopfloor drawing for Castings and forgings. Is there any standard available for making shop floor drawing for sheetmetal parts?

if I have 3 materials and mixed it, can I compute for the specific heat of the "mixed" material? i have the data of the specific heat of each of the material and the precentage by weight. example: material 1 is 46% of the total weight, material 2 is 52% and material 3 is 2% cd =...

Hi, Just recently I have began to panic over what I will do after uni even though I have two full years left. I am studying towards a Bsc physical science with honours but I don't think I can afford to stretch myself financially to carry on in education full time. I would love to study part...

Homework Statement A gold conductor with an electric field of 0.01 V/m applied, is 0.01 m long and 5.0E-5m in radius. Assuming one conduction electron per atom, what is the drift velocity of the electrons at a temperature of 20.0 degrees C? at 50 degrees C? Homework Equations I know that...

Hi guys, My problem is that i have a motor that needs to be turned ON once, every day at a programmable time and for a duration of 10-20 seconds. The power of the motor is bellow 80W. I have searched throught the net on Merlin Gerin, Schrack and similar catlogues but can't find any...

Hello! I stumbled upon these forums and it looks like this is a good place to get an answer to this question. I am an undergrad physics major doing biophysics research and writing a program to help with data analysis. The first step it to write a program in MATLAB that reads in a text file...