Q: A heat engine with a thermal efficiency of 45 percent rejects 500 kJ/kg of heat. How much heat does…
A: Given: Efficiency = 45 % heat rejected, QC = 500 kJ/kg
Q: If someone double the thickness of a wall built from a homogenous material, the rate of energy…
A:
Q: What is the physical mechanism of heat conduction in a solid, a liquid, and a gas?
A:
Q: A 1 kg block of ice is removed from a freezer where its temperature was –10°C. The amount of heat…
A: Given : Mass = 1 kg Temperature change = ( -10 - 0) = 10°C Specific Heat of water (C) = 2,000 J/kg-C…
Q: A Metal container with a mass of 2 kg and containing 2.30 kg of water is put it on a fire. Assume…
A: Mass of metal container = 2 kg Mass of water = 2.30 kg Initial temperature = 20o C Final temperature…
Q: Pieces of copper and glass are heated to a same temperature . Why does the piece of iron feel hotter…
A: Copper is a very good conductor of heat. So, it allows maximum amount of heat to pass through it…
Q: THe amount of heat that a substance has at a given temperature and pressure is called what?
A: Answer:- The amount of heat that a substance has at a given temperature and pressure is called…
Q: An unknown metal weighing 900g at an initial temperature 140oC is placed into an insulated container…
A:
Q: uired to raise the temperature of 4.1 kg of ice at -31.°C to water a
A: Given:- The mass of the ice m = 4.1 kg The change in temperature T1 = -31 oC = -31+273 = 242 K T2…
Q: An unknown metal of mass 1.46 kg absorbs 20.5 kJ of heat causing the temperature of the metal to…
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Q: An automobile cooling system holds 16 L of water. The specific heat of water is 4186 J/kg⋅C. How…
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Q: what factor determines the rate in which a material conducts heat?
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Q: A mass of 50 g of a certain metal at 150° C is immersed in 100 g of water at 11° C. The final…
A: Heat energy lost= heat energy gained Here, heat is lost by the metal and gained by water. Given:…
Q: The temperature of a silver bar rises by 10°C when it absorbs 1.23 kJ of energy by heat. The mass of…
A: The amount of heat absorbed is given as, Here, m, cs, and ΔT represent the sliver bar’s mass, the…
Q: what is the difference between heat transfer by conduction, convection and radiation
A: We know that, The heat transfer is slow in conduction. The heat transfer is faster in convection.…
Q: aluminum has a higher specific heat capacity than iron this means that for equal masses of aluminium…
A: Answer:- Aluminum has a higher specific heat capacity than iron this means that for equal masses of…
Q: Heat from an oven causes the whole kitchen to get warmer.
A: Radiant energy refers to energy that travels by electromagnetic radiation such as heat or x-rays.…
Q: Which of the following does not affect the heat flow by conduction through a slab? O Specific heat…
A: If we have a slab of area A, thickness x, thermal conductivity K, specific heat C and temperature…
Q: Two different objects receive the same amount of heat. Give at leasttwo reasons why their…
A: To determine: The reasons why the temperature changes will not be same for the two different objects…
Q: The rate of heat flow through a slab does not depend on whichof the following? (a) The temperature…
A: The expression for the heat flow rate through a slab is, Here, in the expression, dq/dt is the heat…
Q: If no heat is lost to the environment, what is the specific heat of the cup material? [Hint:…
A:
Q: If the amount of heat energy given to an iron rod is {53} calories, then its value in joules is.
A: The heat energy given to the iron rod is 53 cal. The energy in 1 cal is 41.184 J. The heat energy…
Q: Boiling water, uncovered, on a stove is an example of what method of heat transfer?
A:
Q: A small iron nail is out into a bucket of cool water. Which of the following is true? the decrease…
A: Heat flows from the high temperature to the low temperature. In this flow temperature of the body of…
Q: A potato initially at room temperature (25°C) is being baked in an oven that is maintained at…
A: Since, the system is not defined here, consider the potato as the system. The potato’s skin can be…
Q: 2. A 20 kg metal rod is heated 100°C with 2000 J of energy. What is the specific heat of the metal?
A: Ans. 1 J/kg C0 or 10-3J/g Co
Q: Y-ахis Х-ахis 46 Temperature of a point on the axis of a Displacement of points from the hotter…
A:
Q: Specific Heat refers to any amount of heat needed by one kind of substance for every increase in…
A: Since specific heat is defined as the amount of heat needed to raise the temperature of 1kg of a…
Q: The amount of heat transfered through conduction is proportional to surface area and as well as…
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Q: If the amount of heat energy given to an iron rod is {39} calories, then its value in joules is.
A: Given: The heat energy given to the iron rod is 39 cal.
Q: A house is losing heat at a rate of 1800 kJ/h per °C temperature difference between the indoor and…
A: a) The temperature in Degree Celsius is related to the Kelvin scale as,
Q: What is the relationship between heat and temperature?
A: Heat and temperature are one of the two components in the thermodynamics. Heating a substance…
Q: When a material changes phase - liquid, solid, gas- heat exchange is required. This heat is called…
A: Given: Mass of water, m= 0.55kgChange in temperature, -20 to 20 degree celciusL for ice to water , L…
Q: The process of heat radiation is the ONLY method of heat transfer that can occur under water.…
A: The process of heat radiation is the ONLY method of heat transfer that can occur through space.
Q: If the heat capacity of a certain object of mass M is C, its specific heat is S, then: Select one: O…
A: Required : Relation between the heat capacity and specific heat capacity.
Q: A nail made of iron and a bowl of water have the same temperature because they are on the same table…
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Q: coefficient of thermal conductivity depends on what factors?
A: We know that, The thermal conductivity is defined as, K=QdA∆T Where Q= amount of heat transfer d =…
Q: The temperature of 200 g of water increases from 20°C to 50°C in 10 minutes. Calculate: i. the…
A: Given, amount of the water, m = 200 g = 0.2 kg temperature, T1 = 20 °CT2 = 50 °C time, t = 10…
Q: A mass of 50 g of a certain metal at 150° C is immersed in 100 g of water at 11° C. The final…
A: mass of metal = ms= 50 g temperature of metal = ts= 150 c mass of water = mw= 100 g temperature of…
Q: If there is no transfer of energy between two objects then their temperature is
A:
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- For the human body, what is the rate of heat transfer by conduction through the body's tissue with the following conditions: the tissue thickness is 3.00 cm, the difference in temperature is 2.00 , and the skin area is 1.50 m2. How does this compare with the average heat transfer rate to the body resulting from an energy intake of about 2400 kcal per day? (No exercise is included.)(a) What is the rate of heat conduction through the 3.00-cm-thick fur of a large animal having a I .40-m surface area? Assume that the animal's skin temperature is 32.0 , that the air temperature is 5.00 , and that has the same thermal conductivity as air. (b) What food intake will the animal need in one day to replace this heat transfer?Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 20 rubs, at a distance of 7.50 cm per nub, and with an average frictional force of 40.0 N, what is the temperature increase? The mass of tissues warned is only 0.100 kg, mostly in the palms and fingers.
- One easy way to reduce heating (and cooling) costs is to add extra insulation in the attic of a house. Suppose a single-story cubical house already had 15 cm of fiberglass insulation in the attic and in all the exterior surfaces. If you added an extra 8.0 cm of fiberglass to the attic, by what percentage would the heating cost of the house drop? Take the house to have dimensions 10 m by 15 m by 3.0 m. Ignore air infiltration and heat loss through windows and doors, and assume that the interior is uniformly at one temperature and the exterior is uniformly at another.An astronaut performing an extra-vehicular activity (space walk) shaded from the Sun is wearing a spacesuit that can be approximated as perfectly white ( e=0 ) except for a 5 cm × 8 cm patch in the form of the astronaut's national flag. The patch has emissivity 0.300. The spacesuit under the patch is 0.500 cm thick, with a thermal conductivity k 0.0600 W/m , and its inner surface is at a temperature of 20.0 . What is the temperature of the patch, and what is the rate of heat loss through it? Assume the patch is so thin that its outer surface is at the same temperature as the outer surface of the spacesuit under it. Also assume the temperature of outer space is 0 K. You will get an equation that is very hand to solve in closed form, so can solve it numerically with a graphing calculator, with software, or even by trial and error with a calculator.A sealed room has a volume of 24 m3. It's filled with air, which may be assumed to be diatomic, at a temperature of 24 and a pressure of 9.83104 Pa. A 1.00-kg block of ice at its melting point is placed in the room. Assume the walls of the room transfer no heat. What is the equilibrium temperature?
- A certain steel railroad rails 13 yd in length and weighs 70.0 lb/yd How much thermal energy is required to increase the length of such a rail by 3.0 mm? .Note: Assume the steel has the same specific heal as iron.(a) The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount of heat transfer is measured. How many kilocalories per gram ale there in a 5.00-g peanut if the energy from burning it is transferred to 0. 500 kg of water held in a 0.100-kg aluminum cup, causing a 54.9- temperature increase? Assume the process takes place in an ideal calorimeter, in other words a perfectly insulated container. (b) Compare your answer to the following labeling information found on a package of dry roasted peanuts: a sewing of 33 g contains 200 calories. Comment on whether the values are consistent.A 30.0-g ice cube at its melting point is dropped into an aluminum calorimeter of mass 100.0 g in equilibrium at 24.0 with 300.0 g of an unknown liquid. The final temperature is 4.0 . What is the heat capacity of the liquid?
- When watching a circus during the day in a large, dark-colored tent, you sense significant heat transfer from the tent. Explain why this occurs.Suppose a person is covered head to foot by wool clothing with average thickness of 2.00 cm and is transferring energy by conduction through the clothing at the rate of 50.0 W. What is the temperature difference across the clothing, given the surface area is 1.40 m2?An engineer wants to design a structure in which the difference in length between a steel beam and an aluminum beam remains at 0.500 m regardless of temperature, for ordinary temperatures. What must the lengths of the beams be?