Consider a bar 1 m long that expands 0.6 cm when heated. Show that when similarly heated, a 100-m bar of the same material becomes 100.6 m long.

Q: Why will wrapping a bottle in a wet cloth at a picnic often produce a cooler bottle than placing the…

A: When a bottle is kept in a bucket of cold water, the bottle is being cooled by the process called…

Q: What happens to the amount of 'microscopic slush' in cold water when its temperature is increased?

A:

Q: What happens when an object at a high temperature touches an object at lower temperature?

A:

Q: Woollen clothes are poor conductor of heat but they keeps us warm. Give reason

A: Woolen clothes are thin and there is no much air gap between the fabric. The air pockets lying in…

Q: Why is a calorimeter box made up of Copper?

A: A calorimeter box is made up of Copper because i) Cu has low SHC & thus it reaches the…

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: How does running hot water on a jar lid loosen it?

A: The running hot water on a jar lid loosen it because metals conduct more heat than glass.

Q: Why does the pressure of gas enclosed in a rigid container increase as the temperature increases?

A: Increase in temperature means increase in the kinetic energy of the particles. And increase in…

Q: Show that 600 J is turned into heat.

A: Heat is the form of energy which gives us the sensation of warmth or coldness.

Q: Your friend states that the average speed of all hydrogen and nitrogen molecules in a gas is the…

A: The average speed will not be same for all hydrogen and nitrogen molecules.

Q: Why does the temperature of gas increase when it is suddenly compressed?

A: Temperature of gas increase when it is suddenly compressed because

Q: Why will water at the bottom of a geyser not boil when it is at 100°C?

A:

Q: Consider two glasses, one filled with water and the other half-full, both at the same temperature.…

A: There are two glasses, one of which is completely filled, and the other is half filled, both at the…

Q: Why is it incorrect to say that, when a hot object warms a cold object , temperature flows between…

A: The first law of thermodynamics states that when the two bodies those have the different…

Q: When planes fly in cold weather, the planes need to be de-iced before liftoff. Why is that done?

A: The area serves two purposes  : to collect runoff of deicing fluids in order to protect the…

Q: Consider two glasses, one filled with water and the other half-full, with the water in the two…

A: The average speed of the molecules depends upon the temperature at which the substance is. Since…

Q: Why do woolen blankets keep us warm better than cotton sheets?

A: In the woolen blanket, there are more gaps. So, more air are confined within woolen blanket. Air is…

Q: Why does an iron ball seem to have a lower temperature than a wooden ball despite having the same…

A: iron ball seem to have a lower temperature than a wooden ball despite having the same temperature

Q: When air is quickly compressed, why does its temperature increase?

A: Explanation:

Q: Blow a quick stream of air at the top of the paper and observe what happens.

A:

Q: Is it the boiling of water or the higher temperature of water that cooks food faster in a pressure…

A: Food can be cooked more quickly in a pressure cooker.

Q: Show that 5000 cal of heat is needed to increase the temperature of 50 g water from 0 deg C to 100…

A: Given data as per question Mass of water =50 g Temperature range = 0 to 1000 c Specific heat…

Q: When an air molecule is hit by an approaching faster-moving molecule, does its rebound speed…

A: Given:  an air molecule is hit by an approaching fast moving molecule

Q: In a mixture of hydrogen and oxygen gases at the same temperature, which molecules move faster? Why?

A: The system has two gases that is hydrogen and oxygen. The system will have constant kinetic energy…

Q: why a metal spoon left in a pot of boiling water gets hot so fast ?

A: In metals heat transfer takes place by conduction . In conduction heat transfer takes place by…

Q: Why will wrapping a bottle in a wet cloth for an outing often produce a cooler bottle than placing…

A: Wrapping a bottle in a wet cloth for an outing often produces a cooler bottle than placing the…

Q: How does the frequency of radiant energy relate to the absolute temperature of the radiating source?

A: The frequency of the radiant energy is directly proportional to the absolute temperature of 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: Which generally expands more for an equal increase in temperature- solids or liquids?

A:

Q: Why does the balloon in a smaller container filled with hot water sink after it has been put in a…

A: Given: Why does the balloon in a smaller container filled with hot water sink after it has been put…

Q: Why does a piece of watermelon stay cool for a longer time than sandwiches do when both are removed…

A: Given:  watermelon and sandwiches

Q: Show that heat always flows from high temperature to low temperature.

A: Heat always flows from high temperature to low temperature because of Second law of thermodynamics

Q: Assuming that no molecules leave or are added to the water, what happens to the pot's mass as it…

A: the pot has a small pores on it outer surface  this leads to movement of air molecules through…

Q: Consider 50 g of hot water at 80°C poured into a cavity in a very large block of ice at 0°C. What…

A:

Q: Is the boiling point of water or the higher temperature of the water that cooks food faster in…

A: Pressure cooker works on the principal of steam pressure.

Q: Consider two walls of a house that are identical except that one is made of 10-cm-thick wood, while…

A:

Q: Cars and aeroplanes are streamlined. Why?

A: Cars and aero planes are streamlined because

Q: What does the high specific heat of water have to do with convection currents in the air at the…

A: Specific heat capacity is the amount of heat energy required to raise the temperature of unit amount…

Q: Why is heating more efficient in large apartment buildings than in single-family dwellings?

A: The surface to volume ratio is inversely proportional to the dimension of the building. Hence, a…

Q: Does a good insulator prevent heat from escaping , or does it simply slow its passage?

A:

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.