Consider a 6.0-g steel nail 8.0 cm long and a hammer that exerts an average force of 600 N on the nail when it is being driven into a piece of wood. The nail becomes warmer. Show that the increase in the nail’s temperature is 17.8°C. (Assume that the specific heat capacity of steel is 450 J/kg?°C.)

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: Consider a cylinder with a length of 15 cm and a diameter of 10 cm. The cylinder has a surface…

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Q: Which has more heat: 1g of ice at 0 degree C or 1g of water at 0 degree C? Give reason.

A: Latent heat is the measure of the heat energy per mass released or absorbed during a phase change.

Q: On a chilly 10°C day, your friend who loves cold weather says she wishes it were twice as cold.…

A: Here, 10°C in Kelvin = 10+273 = 283 K         -131.5°C in Kelvin = -131.5+273 = 141.5 K

Q: Hovering over the surface of our skin is a layer of air some 3 millimeters in thickness that acts as…

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Q: Compare the rate of heat conduction through a 13.0-cm-thick wall that has an area of 10.0 m2 and a…

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Q: Does the temperature of a body depend on its size?

A: Answer : No  Temperature is an intensive property it does not depend on the size. Example : If you…

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: 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: If the specific heat capacity of water were less, would a nice hot bath be a longer or shorter…

A: The formula of the specific heat:

Q: In terms of thermal expansion, why is it important that a key and its lock be made of the same or…

A: Given: Key and lock

Q: At what common temperature would a block of wood and a block of metal feel equally cold or equally…

A: for any object feel equal cold or equal hot when it is touched since the temperature of any object…

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: A block of wood and steel is placed in a thermally stable room, which one has a lower temperature?,…

A: Wooden and steel block both are placed in a thermal stable room.

Q: What makes heat transfer by radiation different from conduction and convection?

A:

Q: Why do you feel uncomfortably warm on a hot and humid day?

A: We feel uncomfortably warm on a humid day because as the humidity increases the rate of evaporation…

Q: Consider a car radiator at 110.5°C in a 53.5°C environment and the exchange of heat between them by…

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Q: When determining the specific heat of a metal specimen, why must the water in the inner cup be…

A: Determining Specific Heat

Q: Consider a person whose exposed surface area is 1.7 m2, emissivity is 0.5, and surface temperature…

A:

Q: Why are cloudy nights generally warmer than clear ones?

A: Cloud is defined as dense texture of moisture molecules present in the atmosphere.

Q: When you step out of a swimming pool on a hot , dry day in the southwest , you feel quite chilly.…

A: When heat flows from our body, we feel chilly.

Q: Why do we wear woollen clothes in winter?

A: During winter season the human body temperature increases to the environmental temperature and heat…

Q: Why two thin blankets are warmer than a single blanket of double the thickness?

A: Step 1If there are more layers, air can’t pass deeper.

Q: What is the specific heat of a substance that requires 3500J in order to raise its temperatures from…

A: Given data-        Heat required (δQ) = 3500 J       change in temperature (δT) = 25 K        mass…

Q: Is fur a source of heat to our body?

A: Step 1Animals maintain their body temperature by thermo regulation.

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: Name the method of heat transfer which doesnot depend on gravity.

A: In radiation, heat is transferred without any motion of the medium particles

Q: What do fiberglass and snow have in common that make them good insulators?

A:

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: In terms of thermal expansion, why is it important that a key and its lock be made of same or…

A:

Q: Compare the rate of heat conduction through a 13.0-cm-thick wall that has an area of 10.0m2 and a…

A: The expression for rate of transfer energy through wall is  Pw=kwAw∆Ttw                   ...... (1)…

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

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Q: The cover of a solar coker is made of glass because:    A) it absorbs sun's rays B) it reflects…

A: The glass always produces the green house effect. It does not allow the smaller wavelength to escape…

Q: The energy stored in a foot of snow on a steel roof is

A: NOTE: The question must be (on a steep roof) instead of (on a steel roof) To find out which type of…

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

A:

Q: Why must the mercury bulb of the thermometer not touch the wall or base of the beaker when measuring…

A: Mercury thermometer is a temperature measuring device which is made of a mercury bulb which is…