Consider a bar 1m long that expands 0.6cm when heated. Show that when similarly heated , a 100m bar of the same material becomes 100.6m 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 when an object at a high temperature touches an object at lower temperature?

A:

Q: Which contains more heat, a coffee cup of boiling water or a bathtub with water at room temperature?

A: An average size bathtub contains 250 kg of water and an average size cup contains 0.25 kg of water.…

Q: Does a liquid release energy or absorb energy when it changes into a gas?

A:

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: Why is evaporation a cooling process?

A: Evaporation is the process in which water changes its phase from liquid to gaseous.

Q: Which has the greater amount of internal energy- an iceberg or a cup of hot coffee? Defend your…

A: The internal energy is the sum of all energy within the substance.

Q: Show that 5000 cal are required to increase the temperature of 50 g of water from 0°C to 100°C. The…

A: Heat Required Q = m*c*(T2 - T1 )

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: Consider a bar 1 m long that expands 0.6 cm when heated. Show that when similarly heated, a 100-m…

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: 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: Taking the density of air to be 1.3 kg m near the surface of Earth, show that the number density of…

A: From the question, it is given that- Density of air: ρa=1.3 kg/m3 Pressure = 1 atm = 1.013×105 Pa…

Q: What heats faster, land or water?

A:

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: Cite three examples in which Thermos bottle inhibits heat transfer?

A: The Thermos bottles use thermal isolation to prevent the transfer of the thermal energy or heat.

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: 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: You know that the windows in your warm house get wet on a cold day. But can moisture form on the…

A: On a cooler day, the window surface will be probably cold enough that condensation will form as the…

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: Cooling is produced when a gas at high pressure suddenly expands. Explain.

A: When the gas at high pressure suddenly expands, the average distance between its molecules…

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: What happens to steam pressure and velocity in a converging nozzle?

A: A nozzle is a mechanical instrument/device which is used to control the motion of the fluid flowing…

Q: What type of heat transfer helps the balloon rise?

A: To determine the mode of heat transfer that helps the balloon to rise.

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: How are the speeds of molecules of air affected when the air is compressed by the action of a tire…

A: when the air is compressed by the action of a tire pump, due to high pressure the average speed of…

Q: If water had a lower specific heat capacity, would ponds be more likely to freeze or less likely to…

A: A lower heat capacity means that less energy must be transferred to result in a temperature change.

Q: Derivation of Newton's Law of Cooling from Stefan's Law:

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Q: What is internal energy?

A:

Q: Consider two fluids, one with a large coefficient of volume expansion and the other with a small…

A: The greater the volume expansion coefficient, the greater will be the change in density with…

Q: Cars and aeroplanes are streamlined. Why?

A: Cars and aero planes are streamlined because

Q: Why are heat and temperature not the same thing?

A: To explain : The difference between the heat and temperture

Q: Discuss why water can issue from deep underwater vents at temperatures of some 300°C without…

A: In hydrothermal vents, temperature of water might be as high as 300 degrees but it does not boil.

Q: If you wish to warm 50 kg of water by 20°C for your bath, show that the amount of heat needed is…

A: