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: What is the role of Phase transitions in heat flow?
A: In the heat flow, element takes heat and increase its temperature. Or element release the heat and…
Q: Does a substance absorb or liberate any heat energy during the change of phase?
A: Phase transition is when a material transitions to a different state from a solid, liquid, or gas…
Q: Explain why burns caused by steam at 100°C on the skinare often more severe than burns caused by…
A: Given information: It is given that the burns caused by steam at 100 oC on the skin are more severe…
Q: It’s a hot day, and your apartment is rather warm. Your roommate suggests cooling off the apartment…
A:
Q: How do you calculate specific heat capacity given heat flow, mass and temperature change?
A: We know, the heat flow is given by
Q: How does the kind of material of the calorimeter affect the cooling of the liquid samples?
A: The change in temperature of the liquid is dependent on the material of the calorimeter. A liquid…
Q: Suppose a gas is in an insulated container, so that no heat energy can escape. If a piston is used…
A: Lets says there is a cylindrical container whose wall as well as roof and bases are insulated that…
Q: Using own words, discuss latent heat.
A: The amount of heat required to change the phase of a substance at constant temperature per unit mass…
Q: How do specific heats of solids vary with temperature?
A: The ability of a substance to absorb heat is known as Specific heat
Q: How is the loss of heat due to radiation minimised in a calorimeter?
A: Heat loss due to radiation is minimized by polishing the box in order to smoothen it.
Q: Can a heat be added to a system without increasing its temperature?
A: The isothermal process in which the temperature of a system remains constant, the transfer of heat…
Q: Does a substance that cools off quickly have a high or low specific heat capacity?
A:
Q: What happens if the calorimeter is not covered properly?
A: Calorimeter or bomb calorimeter is defined as a apparatus used for measuring the amount of heat…
Q: Can a rooom be cooled by keeping the door of refrigerator open?
A:
Q: How does the second law of thermodynamics relate to the direction of heat flow?
A: Let us understand this with an example. A hot cup of coffee is kept in open atmosphere.
Q: When can you add heat to object without raising its temperature?
A: When two phases co-exists in a system, any heat added or removed from the system will result in…
Q: Distinguish between a calorie and a Calorie?
A: Distinguish between a calorie and a Calorie is given below:
Q: A process in which no energy is transferred by heat between a system and its surrounding, is called?
A:
Q: What does it mean to say that two systems are in thermal equilibrium?
A: What does it mean to say that two systems are in thermal equilibrium?
Q: E7. How much heat must be removed fro aluminum to lower its temperature fr The specific heat…
A:
Q: When thermal energy is removed from a system, what happens to temperature and the average kinetic…
A: Temperature is a measure of average kinetic energy of the molecules of the system. As the…
Q: Why is thermal equilibrium always established when two objects transfer heat?
A: Heat is a form of energy that transfers from higher temperature to the lower temperature. At higher…
Q: Calculate the amount of heat needed to change a 1 kg block of ice at -10 degrees Celsius to steam at…
A: Heat used to increase the temperature H = m c (T'- T) The heat used to change the phase H = m L…
Q: propertie3 U gu3 la atte sanadoud 5) Can you add heat to a sub something else that is not
A: According to conservation of energy Energy can neither be created nor be destroyed but it can be…
Q: One method of getting a tight fit, say of a metal peg in a hole in a metal block, is to manufacture…
A:
Q: The heat supplied to a substance during its change of state, does not cause any rise in temperature?…
A: The heat energy supplied to the substance during its change of state does not occur any rise in…
Q: Name three factors on which the heat energy absorbed by a body depends and state how does it depend…
A:
Q: Someone claims that the air space in a double-pane window enhances the heat transfer from a house…
A: We would disagree with this recommendation since the air space introduces some thermal resistance to…
Q: cific heat capacity is rel a. Needed to change th b. Transferred by one c. Transferred by one d. A…
A: Heat capacity is the amount of heat required to change the heat content of 1 mole of material by…
Q: How are you quickly able to bring a pan of water to a boil when water is poor conductor of heat?
A: The conductivity of water is less than that of most metals but greater than that of air. Even though…
Q: Does a common electric fan cool the air in the room? If not then why it is used an overly warm room?
A: A fan doesn’t cool the room but it only recirculates the air in the room and the air inside is…
Q: What is the definition of an “empty calorie”?
A:
Q: Discuss the modern concept of heat based on internal energy.
A:
Q: Why is there a need for a quick transfer of the hot shots into the water in the calorimeter?
A: The transfer hot shots into the water in calorimeter should be done as quick as possible.
Q: Distinguish between a calorie and a joule?
A: Both calorie and joule are the units of energy. The main difference in both the units is that a…
Q: Do water and ice have same specific heats?
A: The specific heat capacity is the amount of heat energy desired to increase the temperature of a…
Step by step
Solved in 2 steps
- Unreasonable results. (a) Find the temperature of 0.360 kg of water, modeled as an ideal gas, at a pressure of 1.01105 Pa if it has a volume of 0.615 m3. (b) What is unreasonable about this answer? How could you get a better answer?Can carbon dioxide be liquefied at room temperature (20 If so, how? If not, why not? (See the phase diagram in the preceding problem.)A diver 60 mm deep in 10∘C∘C fresh water exhales a 1.5 cmcm diameter bubble. What is the bubble's diameter just as it reaches the surface of the lake, where the water temperature is 20∘C∘C? Assume that the air bubble is always in thermal equilibrium with the surrounding water. Express your answer in centimeters.
- In an experiment, a 0.240-kg piece of ceramic superconducting material at 21 °C is placed in liquid nitrogen at itsboiling point (-195.8 °C) to cool. The nitrogen is in a perfectly insulated flask that allows the gaseous N2 to escapeimmediately. How much mass of liquid nitrogen will be boiled away? (Take the specific heat of the ceramic material to bethe same as that of glass.)The specific heat of water is quite large. Explain why thisfact makes water particularly good for heating systems(that is, hot-water radiators).Why do we characterize the heat conduction ability of insulators in terms of their apparent thermal conductivity instead of the ordinary thermal conductivity?
- A 10 cm thick piece of beef steak will be frozen in the freezer room -35 ° C. This product has a moisture content of 73%, a density of 970 kg / m³, and a thermal conductivity (frozen) of 1.1 W / (m K). Estimate the freezing time. using the Plank equation. This product has an initial freezing temperature of -1.75 ° C, and the movement of air in the freezing room gives a convective heat transfer coefficient of 10 W / (m² K). t f = hour.What Have I Learned So Far? The silica cylinder of a radiant wall heater is 60 cm long and has a radius of 5 mm. If it is rated at 1.5 kWatts estimate its temperature when in operation. 2.4 -8 W / m K Assume e = 1 and =5.67 x 10I want the calculation for this expiremnt Note: the unit of thermal conductivity w/m.k
- To compare the 3 temerature scales, "phase transition temperture of water is used. Phase transition temperature of water in Kelvin sclae is listed as ..........choose one correct answer A. Freezing 0K Boiling 273K B. Freezing 0K Boiling 373K C. Freezing 0K Boiling 100 K D. Freezing 273 K Boiling 373 KGiven the heat capacity of copper (0.385 J/goC) and of water, if you place a 100oC copper block into a cup of 20oC water, what do you expect the equilibrium temperature of the two to be, in oC? Assume that the cup is well insulated so that there is no heat gain from or loss to the environment. The block and the water in the cup have the same mass.A 12-g lead bullet traveling at 220 m/s passes through a thinwall and emerges at a speed of 160 m/s If the bullet absorbs50% of the heat generated, (a) what will be the temperaturerise of the bullet? (b) If the bullet’s initial temperature was20°C, will any of the bullet melt, and if so, how much?