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Temperature

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.

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?

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)

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

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

Thermal conductivity: Heat required to maintain temperature of a house.

A house has well-insulated walls 17.1 cm thick (assume conductivity of air) and area 386 m2, a roof of wood 6.20 cm thick and area 298 m2, and uncovered windows 0.648 cm thick and total area 33.0 m2. Assuming that the heat loss is only by conduction, calculate the rate at which heat must be supplied to this house to maintain its

Temperature, Pressure and Heat

A constant volume (ideal) gas thermometer has a pressure of 62 kPa at 100 oC. What is its pressure at 197 oC to the nearest kPa? If the pressure in the thermometer above was 109 kPa, to the nearest celsius degree what is the temperature?

Ideal Gas Pressure

The temperature of an ideal gas is increased from 108oC to 348oC while the volume and the number of moles stay constant. By what factor does the pressure change?

Pendulum frequency problem

The pendulum in a grandfather clock is made of brass and keeps perfect time at 18.1 degree C. How much time is gained or lost in a year if the clock is kept at 24.3 degree C? Assume the frequency dependence on length for a simple pendulum applies. Enter a positive number for a gain, negative for a loss.

Rivet

To make a secure fit, rivets that are larger than the rivet hole are often used and the rivet is cooled (usually in dry ice) before it is placed in the hole. A steel rivet 1.806 cm in diameter is to be placed in a hole 1.805 cm in diameter. To what temperature (on the Celsius scale) must the rivet be cooled if it is to fit in th

Expansion Coefficient for Aluminum Rivets in Airplane Construction

Ensuring a tight fit - aluminum rivets used in airplane construction are made slightly larger than the rivet holes and cooled by "dry ice" (solid CO2) before being driven. If the diameter of a hole is 4.500mm, what should be the diameter of a rivet at 23.0 C if its diameter is equal to that of the hole when the rivet is cooled t

What is the temperature gradient from inside to outside the wall?

A wall has an inside temperature 149 Celsius and outside temperature 22 Celsius. Its area is 6 m^2 and its uniform thickness is .38m. What is the temperature gradient from inside to outside? If the inside temperature decreased, thereby increasing the temperature difference by a factor of 1.749 what would be the temperature gr

Saturation temperature

How do you determine when the saturation temperature is reached when dissolving at various temperatures?

Quadratics

An amateur brewer has made some experimental batches of beer with the aim of optimizing the taste of future batches. The brewer rates the beer on a scale of 0-10. Except for the brewing temperature, the brewer has already settled on the other aspects of the brewing process. These latest batches are meant to assist in the determi

Combined Gas Laws : Pressure, Volume and Temperature

P6. Solve problems involving the gas laws... Task 1: The temperature of 2 litres of gas at 100 kPa rises from 18°C to 163.5°C. If the volume remains constant, what does the pressure change to? Task 2: In an air pump, the cylinder volume is 20 litres when the piston is at the top of its compression stroke. The pressure is the

Physics: Problems Based on Refrigeration

Hi, I need some assistance solving the following problems: 1. An ice chest is maintained at 0 degrees Celsius by ice placed in it. The chest is cubical with each inside wall having an area of 1200cm^2 and a thickness of 4cm. Each wall is made of foam plastic with k= 1.3X10^-4 cal/cm/s/C. How much ice will melt in the chest i

Expansion Of Steel Rods During Temperature Change

A steel meter rod reads the correct length of objects at 20 degrees C. If the temperature of the steel rod increases to 30 degrees C and the scale to measure the length of an object, it will a) Give the correct length of the object b) Underestimate the actual length of an object c) Overestimate the actual length of the obje

A temperature

A temperature of -162 degrees C corresponds to a. 111k b. -111k c. -162k d. 162k

Volume; Density; Mass; Temperature - Frictional Heat

1. What volume of foam (lifevest) with a given density will be needed to keep a person, with a given mass and density, 1/3 out of the water? 2. A 20g lead bullet moving at 400m/s strikes a tree. How much will the temperature be raised if 1/2 of the frictional heat goes into the bullet?

Work done on gas, entropy changes, temperature.

1. A 4 L sample of a diatomic gas with specific heat ratio 1.4, confined to a cylinder, is carried through a closed cycle. The gas is initially at 1 atm and 300 K. First, its pressure is tripled under constant volume. Then, it expands adiabatically to its original pressure. Finally, the gas is compressed isobarically to its