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
A wall is composed of two materials. Material 1 has a thickness of 4.72 cm and a thermal conductivity of 0.1 while material two has a thickness of 6.06 cm and a conductivity of 1. If the temperature difference inside to outside is 25 Co and the wall has an area of 10 m2, what is the energy loss per second to the nearest watt?
A steel (α = 12 x 10-6Co) container with a volume of 571 cm3 is filled with oil (β = 0.7x10-3 Co). If the temperature is increased by 30.6 Co how many cubic centimeters overflow to the nearest tenth of a cm3?
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?
A tire is filled with air at 14.9 degree C to a gauge pressure of 231 kPa. If the tire reaches a temperature of 37.5 degree C, what fraction of the original air must be removed if the original pressure of 231 kPa is to be maintained?
The pendulum in a grandfather clock is made of brass and keeps perfect time at 18.1oC. How much time is gained or lost in a year if the clock is kept at 24.3oC? Assume the frequency dependence on length for a simple pendulum applies. Enter a positive number for a gain, negative for a loss. Remember it is for a year.
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?
A tyre is filled with air at 14.9 degree C to a gauge pressure of 231 kPa. If the tyre reaches a temperature of 37.5 degree C, what fraction of the original air must be removed if the original pressure of 231 kPa is to be maintained?
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.
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
A vibrating stretched string has length 38 cm, mass 25 grams and is under a tension of 30 newtons. What is the frequency to the nearest Hz of its 3rd harmonic? If the source of the wave was an open organ pipe of the same length as the wire, what would be the frequency of the 2th harmonic?
Both the pressure and volume of a given sample of an ideal gas double. This means that its temerature in kelvin did what?
Aluminum has a positive coefficient of thermal expansion. Consider a round hole that has been drilled in a large sheet of aluminum. As the temperature increases and the surrounding metal expands, what will the diameter of the hole do?
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. If we use the following data points: Fahrenheit Celsius
An air conditioner maintains a room at 70 degrees F (294.3K) when the outdoors temperature is 90 degrees F (305.4K). If its actual coefficient of performance, K, is half that of an ideal Carnot refrigerator, what is the value of K? (See attached file for full problem description)
Water at 50 degrees C can be obtained by mixing together which one or more of the following combinations? Which of the others would have final temperatures higher than 50 degrees C and which lower than 50 degrees C? What will be the final temperatures for these combinations? a. 1 kilogram of ice at 0 degrees C and 1 kilogr
In one hour the average person at rest consumes 14.5 L of oxygen at a pressure of 1 atm. and a temperature of 20 degree C. A person at rest inhales and exhales 0.5 L of air with each breath. The inhaled air is 21.0 % oxygen, and the exhaled air is 16.3 % oxygen. a) How many breaths per minute will satisfy the person's oxygen
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
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 gradi
How do you determine when the saturation temperature is reached when dissolving at various temperatures?
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
P6. Solve problems involving the gas laws... Task 1: The temperature of 2 liters 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 liters when the piston is at the top of its compression stroke. The pressure is the
Fill an empty 2 liter bottle 1/3 full with the hottest tap water you can get. Immediately screw the cap on. Set the bottle aside and let it cool. The side buckles. Why?
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
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 of -162 degrees C corresponds to a. 111k b. -111k c. -162k d. 162k
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?
Technical Physics How do you find the bouyancy force of a spherical balloon given radius and 1atm pressure.
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
By how much will a slab of concrete 18m long contract when the temperature drops from 24 degrees C to -16 degrees C. (the coefficent of linear thermal expansion for concrete is 12*10^-6 per degree C.) a. 0.86 cm b. 0.52 cm c. 8.6 cm d. 0.17 cm