A body cools from 80 °C to 50 °C in 5 minutes. Calculate the time it takes to cool from 60 °C to 30 °C. The temperature of the surroundings is 20 °C.

Q: If 7.5 kg of ice at 0 degrees celcius is put into an icebox, how many joules of heat are absorbed…

A: The heat absorbed by the ice to melt into water is given by                          Q= m L…

Q: On a day when the temperature reaches 50°F, what is the temperature in degrees Celsius and in…

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Q: On a day when the temperature reaches 500 F, what is the temperature in degrees Celsius and in…

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Q: If 16,000 cal of heat are added to 50 g of water initially had a temperature of 10°C, what is the…

A: Given: Mass m = 50 g Heat added Q = 16000 cal or 6694.4 joule Temperature initially Ti = 10o C To…

Q: A change of 20 degrees Celsius is the same as a change of ________ Kelvin.

A: Given: The change in temperature on Celsius scale is 20oC.

Q: A 30-kg child has a temperature of 39 °C. How much heat must be removed from the child’s body to…

A: The change in thermal energy is given by

Q: The heat of vaporization of water is 2257 Joules/gram or 540 calories/gram. What energy in Joules is…

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Q: How much heat is needed to heat 5 kg of water from 20 degrees Celsius to water vapor at 100 degrees…

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Q: A woman finds the front windshield of her car covered with ice at -14.3 °C. The ice has a thickness…

A: Given, temperature of the ice in front windshield, T = -14.3 °C thickness of the ice, t = 4.86×10-4…

Q: What is the change in the rate of the radiated heat by a body at the temperature T1 = 20ºC compared…

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Q: How much heat is transferred in 9 minutes through a glass window of size 1.4 m by 1.3 m, if its…

A: Solution:

Q: What is the new area of a copper plate that is 50 mm long, 30 mm wide, and 10 mm high when it…

A: The expression for area thermal expansion is written as, Here, Anew, Ao, α  and ΔT represent the…

Q: By what percent will the radiated heat per square meter increase due to such a temperature…

A: We know that radiated head energy per unit area = eσT4 Where ,e is emmisivity and σ is Stefan…

Q: One cold winter morning you discover a 0.62 cm thick layer of ice on the windshield, which has an…

A: Given:  Thickness of ice layer, t = 0.62 m  Area of ice layer, A = 1.7 m2 density of ice, d = 917…

Q: What would be the rate of energy loss, in Watts, for a piece of asphalt that has an area of 2.80 m2…

A: Given data: The area is A=2.8 m2. Temperature is T=60°C.

Q: The temperature reading on this outdoor thermometer is in degreesFahrenheit. What is the temperature…

A: 1 small division=2°F The temperature shown here is 5 divisions after 40°F, So the temperature…

Q: What is the SI unit of temperature?

A: SI Unit of temperature is

Q: a small metal bar, whose initial temperature was10 degrees celcius, is dropped into a large…

A: According to Newton's Law of Cooling, T = Tm + cekt, where T = the required temperature after time…

Q: Luis and Salman are trying to increase the temperature of a substance by heating it.. What is the…

A: Given:mass of substance, m = 3.2 kgSpecific heat,Cp for: Solid phase→600 J/kg K…

Q: Some amount of heat energy is removed from a 9cm X 22cm X 16cm block of ice to cool from 0°C to…

A: Dimensions of ice block = 9 cm , 22 cm , 16 cm Volume of ice block = 9×22×16 cm3= 3168 cm3Initial…

Q: How much heat in joules is needed to raise the temperature of 5.0 L of water from 0 degrees Celsius…

A: Given data:  Volume of water = 5.0 L = 5.0 × 10-3 m3 Initial temperature (T0) = 0 °C Final…

Q: Some amount of heat energy is removed from a 16cm X 26cm X 28cm block of ice to cool from 0°C to…

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Q: A bottle containing 6 kg of water at a temperature of 15°C is placed in a refrigerator where the…

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Q: A temperature change of 20 degree Celsius is equal to a temperature change of how many in degree…

A: The temperature conversion formula to change degree Celsius to degree Fahrenheit is given by,…

Q: In a warm room a naked resting person has a skin temperature of 33°C if the room temperature is 29°…

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Q: What is the ratio of specific heat of sand to the specific heat of water?

A: The specific heat of water is very high, and the specific heat of sand is low.

Q: The temperature on a winter day is 14f . What is the temperature in degrees Celsius.?

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Q: A person with a skin temperature of 33°C is in a room at 24°C. What is the net rate of heat transfer…

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Q: If you have 500 g of water at 25 degrees celcius and wish to heat it to 74 degrees Celsius, how much…

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Q: A scientist is trying to determine the specific heat of 15.0 g of an unknown substance. He heats up…

A: Given: Mass of unknown substance = 15 g Temperature before placing it into water = 100 °C Mass of…

Q: A 10-kg iron ball is dropped onto a pavement from a height of 100 m. If half of the heat generated…

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Q: A 240.0 g china serving bowl is warmed 64.7°C when it absorbs 3.5 kcal of heat from a serving of hot…

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Q: Ex(1): What is the amount of heat energy necessary to raise temperature ( 3 kg ) of Aluminum from (…

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Q: Some amount of heat energy is removed from a 10cm X 20cm X 43cm block of ice to cool from 0°C to…

A: Given that -- Some amount of heat energy is removed from a 10cm X 20cm X 43cm block of ice to cool…

Q: a comfortable temperature is 75 degree f. what is this temperature, expressed in degrees kelvin

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Q: A hot steel plate with a surface area of 2.47 m2 and a constant surface temperature of 161°C is…

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Q: What is the amount of heat it generates in a minute?

A: according to joules heat law. heat generated in conductor H = i2Rt where i = amount of current…

Q: A body cools from 72 degrees to 60 degrees C in 10 minutes. How much time will it take to cool from…

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Q: Water flowing over the Osprey Falls in Yellowstone National Park drops  46 m.  If all of the…

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Q: window glass 0.50-cm thick has dimensions of 3.0 m by 1.5 m. If the outside temperature is -10°C and…

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Q: A box ,total surface area 2.20m² and a wall thickness 6cm is made of an insulating material.10 W…

A: We have to find the thermal conductivity(k) of the insulating material. And it is given that we have…

Q: If the degrees Fahrenheit scale is twice the degrees Celsius scale, what is the temperature value in…

A: Given data: TF = 2TC Required: Temperature valve in °F and °C

Q: A bottle containing 6 kg of water at a temperature of 15°C is placed in a refrigerator where the…

A:

Q: A hot steel plate with a surface area of 2.17 m2 and a constant surface temperature of 165°C is…

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Q: A biology experiment requires the preparation of a water bath at 37.0°C (body temperature). The…

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Q: How much heat is required to melt 30kg of ice at 0 degrees celsius to water at 90 degrees celsius?

A: Converting ice at 0oC to water at 90oC is two step process. step 1 - The ice at 0oC is converted is…

Calorimetry

Measuring the heat transferred during chemical reactions or other physical processes is known as calorimetry. It comes under the branch of thermochemistry.