Old-time kitchen lore suggests that things cook better (evenly and without burning) in heavy cast-iron pots. What desirable characteristics do such pots have?

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 you want to preserve the hotness of the coffee, while waiting for your date, should you add the…

A: If you want to preserve the hotness of the coffee, you should add the cream now or later by the…

Q: If you vigorously shake a can of chicken broth back and forth for more than a minute, will the…

A: Yes increases.

Q: How an ice box or refrigerator keep things cold for a long time?

A: Refrigerator works based on the principle heat is taken from the source at a higher temperature and…

Q: In cooling a drink, does it make any difference whether 10 g of water at 0oC is added or 10 g of…

A: There are three different states of matter : solid(ice) , liquid(water), gas(steam) The energy…

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: A beaker full of hot water is placed on a wooden table. Does it lose heat? If yes in what ways?

A: Yes, the hot water in the beaker will lose heat.

Q: When is a system considered to be in thermal equilibrium? When does heat transfer from one body to…

A: Required : When is a system considered to be in thermal equilibrium.

Q: On a cold winter morning, why does the metal of a bike feel colder than the wood of a porch?

A: The thermal conductivity of the metal of a bike is higher when compared to that of the thermal…

Q: Why is wet sand at a beach cooler to walk on than dry sand?

A: Walk on the wet sand

Q: Will pasta cook faster if the water boils more vigorously?Explain

A: No, the pasta will not cook faster if the water boils vigorously

Q: Can the temperature of a system be increased without heating it?

A: Yes, the temperature of a system can be increase without supplying heat to the system.

Q: Consider two identical 4-kg pieces of roast beef. The first piece is baked as a whole, while the…

A: Two identical 4 kg pieces of roast beef are given. One of them is baked as a whole and another one…

Q: Why do thin french fries cook faster than thick fries?

A: Surface area of small object is large, so the smaller the object the larger the surface area.

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: Show how a change in ⁰C is equal to a change in K (Kelvin).

A:

Q: Air-conditioning units contain no water whatever, yet it is common to see water dripping from them…

A: Given:  air conditioning unit

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: You apply a flame to 2 L of water for a certain time and its temperature rises by 1°C. If you apply…

A: We know,  Q = m*c*Δt Mass can further be represented in terms of volume as - Density = mass/volume.…

Q: Why does the fire in fireplace burn more briskly on a windy day?

A: There are two reasons for the fire burns more briskly on a windy day. On a windy day, the wind…

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: Two rods each having a length of 20 cm and a radius of 5 cm are coonected as shown. How much heat is…

A:

Q: A process in which no energy is transferred by heat between a system and its surrounding, is called?

A:

Q: An old remedy for a pair of nested drinking glasses that stick together is to run water at different…

A: When two thinking glasses are nested together, in order to separate them, cold water flows into the…

Q: Consider two cold canned drinks, one wrapped in a blanket and the other placed on a table in the…

A: The heat transfer from the drink which is placed on a table is more because in this resistance due…

Q: Consider two equal-size rooms connected by an open door. One room is maintained at a higher…

A: Since rooms are identical they have same volume and since the doors are open they have same…

Q: Why do frying pans have a thick base?

A: A thick base pan has higher mass hence higher heat capacity. A substance with large heat capacity…

Q: A spring is made of steel and not of copper. Why?

A: A good spring should have high restoring capacity and elasticity properties and both these…

Q: How much heat energy is required to raise 3.97 g of aluminum by 17.0 K? A. 0.23 J B. 73 J C. 62 J…

A: Given data :- mass of aluminum m = 3.97 g change in temperature ∆T = 17 K  = 17 °C

Q: Suppose that the breakfast of a typical 65 kg adult gives him 1.85 x 105 J of energy. How long does…

A: Given: The mass of the adult m = 65 kg The energy had in breakfast E = 1.85 x 105 J The acceleration…

Q: Can you explain to me in about 5 sentences why a metal bench feels colder then a wooden bench even…

A: Given statement :  " A metal bench feels colder then a wooden bench even though they are both under…

Q: Metal lids on glass jars can often be loosened by running hot water over them. Why does that work?

A: Metal lid on glass jar is generally made up of steel or aluminum.

Q: Farmers resort to spraying fruit trees with water before a frost to protect the fruit from freezing.…

A:

Q: The heat never flows spontaneously from a colder object to a hotter object. why?

A: Heat flows

Q: What has the greatest increase in Temperature given these materials of the same mass receive the…

A:

Q: Can two objects be in thermal equilibrium if they are not touching ?

A: Zeroth law of thermodynamics If two objects A and B are in thermal equilibrium with another object…

Q: Inside a room at a uniform comfortable temperature, metallic objects generally feel cooler to the…

A:

Q: A piece of wood lying in the Sun absorbs more heat than a piece of shiny metal. Yet the metal feels…

A: A piece of wood lying in the Sun absorbs more heat than a piece of shiny metal.

Q: If you have steel and wood at 0 °C, which feels colder? If you have steel and wood at 100 °C, which…

A: Material having high thermal conductivity transfers heat more easily. Case 1. Metals usually have…

Q: Does a hot object contain internal energy or does it contain heat?

A: Heat is the energy transferred from hot object to the cold object.

Q: Which law of thermodynamics tackles the role of insulators and conductors in heat flow: zeroth,…

A:

Q: Why is it easier to start a fire with kindling rather than with large sticks and logs of the same…

A: Oxygen in air help to burn. Kindling has large surface area than the large sticks and logs of the…

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: Why must an object be weighed at room temperature?

A: To explain :  Why must an object be always weighed at room temperature