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Temperature

Heat

Problem: Which would require more heat, melting 500 g of 00C ice or turning 500 g of 1000C water into steam? Problem: A 500g sample of an unknown material requires 750 calories of heat to raise its temperature by 500C. Use equation to solve the problem.

Financial or Public Economic Questions

1. Consider an economy with two people, Henry and Catherine, who consume two commodities, bread and water. Suppose that, due to a drought, the authorities decide to allocate exactly half the available water to each person. In order to prevent one person from "exploiting" the other, neither person may trade away any water to t

Speed of Sound in a Gas

A monatomic ideal gas(y=1.67) is contained within a box whose volume is 2.5 m^3. The pressure of the gas is 3.5 x 10^5 Pa. The total mass of the gas is 2.3 kg. What is the speed of sound in the gas?

Sound Travel Distance; wavelengths in the distance traveled

The distance between a loudspeaker and the left ear of a listener is 2.70 m. a.) How long would it take for sound to travel this distance if the air temperature is 20 degrees C. b.) Assuming that the sound frequency is 523 Hz, how many wavelengths of sound are contained in this distance?

Length of Wire To Support a Mass

I have rubber as having a negative coefficient of thermal expansion when it is under tension and that value being -43 x 10^-6/deg K. A rubberband will shrink when heated if it is under tension. The problem has a large rubberband attached to a ceiling, a wire of aluminum of unknown cm. length attached to the hanging end of t

Determining the Diameter of a Bore in a Thermometer

How would I find the diameter of a bore (tube) in a thermometer if I have the mercury expanding about 2 cm in length for 10 degrees C. rise in temperature and that the volume of mercury in the bulb is 0.1 cubic meter?

The Kelvin Temperature of a Fixed Mass of an Ideal Gas

The Kelvin temperature of a fixed mass of an ideal gas is halved. Simultaneously, the pressure applied to the gas is increased by a factor of two. By what factor does the volume of the gas change due to the changes in temperature and pressure?

Maximum Thermodynamic Efficiency

A company that produces pulsed gas heaters claims its efficiency is approximately 90%. If the engine operates between 250 degrees C and 25 degrees C, what is its maximum thermodynamic efficiency?

Temperature conversion program

Write a temperature conversion program in Java that converts from Fahrenheit to Celsius. The Fahrenheit temperature should be entered from the keyboard (via a JTextField). A JLabel should be used to display the converted temperature. Use the following formula for the conversion: Celsius = 5/9 x ( Fahrenheit -32) Input of l

Psychrometry Questions

A psychrometer gives a wet bulb and a dry bulb temperature of 19.7°C and 25°C respectively. Solving the problem without the psychrometric chart determine: i. The humidity ratio ii. The relative humidity iii. The dewpoint temperature iv. The specific volume of the mixture v. The enthalpy per kg of dry air.

Volumetric Efficiency and Delivery Temperature

A single stage double acting air compressor takes in air at a pressure of 1.013 bar and a temperature of 15 C. The air is delivered at a pressure of 7 bar and the clearance volume is 5% of the swept volume. The indicated power of the compressor is 60 kW. Assuming that the compression index, n = 1.3 and that the specific gas con

Thermal Expansion of a flagpole

A tall steel flagpole was erected in Vancouver for Canadian Expo 1986. If the flagpole gets 5.1 mm taller when the average ambient temperature increases by 5.0^o C, approximately how tall is the flagpole?

Expansion of Solids - Solve for Each Variable

Expansion of Solids: Lo = length ?t = temperature change x = coefficient of linear expansion Using the following equation, show the final equation needed to solve for each variable: ?L = x Lo ?t Solve for: x = Lo = ?t = ?

Two large containers A and B...

Two large containers A and B of the same size are filled with different fluids. The fluids in containers A and B are maintained at 0 C and 100 C, respectively. A small metal bar, whose initial temperature is 100 C, is lowered into container A. After 1 minute the temperature of the bar is 90 C. After 2 minutes the bar is removed

Copper bar increasing in length to activate switch for air conditioning

See attached graph. A thin, straight copper bar 3.00 meters long at 30.0 degrees C is arranged to activate a switch that turns on the air conditioning when the temperature gets too high. The bar must increase in length 0.300 mm to reach the switch. What must the higher temperature be to increase the length of the copper bar

Ice Cube Melting

A 500.0 gram ice cube (initially at 0.00 oC) is placed in a Styrofoam box with wall thickness 1.0 cm and total surface area of 6.0 x 102 cm2. If the air surrounding the box is at 20.0 oC and after 4.0 hours the ice is completely melted, what is the conductivity of the Styrofoam material?

Specific Heat of Ice and Calorimetry

A 40 g block of ice is cooled to -78 degrees C and is then added to 560 g of water in an 80 g copper calorimeter at a temperature of 25 degrees C Determine the final temperature of the system consisting of the ice, water and calorimeter. If all the ice melts, determine how much ice is left. Remeber that the ice must fir

Heat and Temperature: Thermal Expansion

A brass ring of diameter 10.00 cm at 20.0 degrees C is heated and slipped over an aluminum rod of diameter 10.01 cm at 20 degrees C. Assuming the average coefficients of linear expansion are constant, a) to what temperature must the combination be cooled to separate the two metals? Is that temperature attainable? b)

Temperature Dependence of Resistance: Currents

While taking photographs in death valley on a day when the temperature is 58.0 degree Celsius, Bill hiker finds that a certain voltage applied to a copper wire produces a current of 1.000A. Bill then travels to Antarctica and applies the same voltage to the same wire. What current does he register there if the temperature is -88

Thermal physics and Ideal gas law

Question 1: The figure below is a plot of Fahrenheit temperature versus Celsius temperature. (a) Is the value of the y-intercept found by setting (Helpful Hint: The y-intercept is found by setting your x-value to 0. Look at the graph and determine what your x and y-axis represent.) 1. TF = TC 2. TC = 0 or 3. TF = 0? (b) C

Pressure Volume and Temperature of a Compressed Piston

See attached file. A cylinder that has a 40.0 cm radius and is 50.0 cm deep is filled with air at 20.0°C and 1.00 atm (Fig. P19.58a). A 22.0 kg piston is now lowered into the cylinder, compressing the air trapped inside (Fig. P19.58b). Finally, a 75.0 kg man stands on the piston, further compressing the air, which remains at

Thermal Expension: Gasoline volume at different temperature

The density of gasoline is 730 kg/m^3 at 0°C. Its average coefficient of volume expansion is 9.60x10^-4/C°. If 1.00 gallon of gasoline occupies 0.00380 m^3, how many extra kilograms of gasoline would you get if you bought 11.0 gal of gasoline at 0°C rather than at 17.0°C from a pump that is not temperature compensated?

Equations

In the real world, what might be a situation where it is preferable for the data to form a relation but not a function? There is a formula that converts temperature in degrees Celsius to temperature in degrees Fahrenheit. You are given the following data points: Fahrenheit Celsius Freezi

Latent heat and phase change

A 40-g block of ice is cooled to -78 degrees C. It is added to 560 g of water in an 80-g copper calorimeter at a temperature of 25 degrees C. Determine the final temperature. (If not all the ice melts, determine how much ice is left) Remember that the ice must first warm to 0 Degrees C to melt, and then continue warming as water

Heat Transfer and Change of Phase: Mixing ice and water

A beaker of water sits in the sun until it reaches an equilibrium temperature of 30 degrees C. The beaker is made of 100g of aluminum and contains 180g of water. In an attempt to cool this system, 100g of ice at 0 degrees C is added to the water. A) determine the final temperature. If Tf = 0 degree C, determine how much ice rema

The following table shows the daily high temperature and maximum market price for electricity during 7 days this last summer. Using the data in the table calculate the regression equation, including the slope and intercept terms, R squared, and the SE of

The following table shows the daily high temperature and maximum market price for electricity during 7 days this last summer. Using the data in the table calculate the regression equation, including the slope and intercept terms, R squared, and the SE of the regression (SE of the estimate). Based on your results, how well does

Heat: Change in phase and latent heat capacity

1) 1 kg of ice is taken from a temperature of -34 o C into steam at 161 o C. To the nearest kJ what is the energy used? 2) 2 kg of ice at 0 oC is dropped into 3.99 kg of water at 13 oC. To two decimal places what fraction of the ice melts? 3) 1 kg of ice at -30 oC is dropped into 25 kg of water at 56 oC. To the nearest t