If you drop a piece of ice on a hard surface, the energy of impact will melt some of the ice. The higher it drops, the more ice will melt upon impact. Show that to completely melt a block of ice that falls without air drag, it should ideally be dropped from a height of 34 km. [Hint: Equate the joules of gravitational potential energy to the product of the mass of ice and its heat of fusion (in SI units, 335,000 J/kg). Do you see why the answer doesn’t depend on mass?]

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: Which of the following is NOT unit of heat? O calorie O Btu sanor O none of these Joules

A: The SI unit of energy is Joule.  The other units are calorie and Btu.  1 calorie = 4.18 J  1 Btu =…

Q: Steam expands behind a piston doing 67,800 joules of work. If 12.7 kJ of heat is radiated to the…

A: Given ∆Q=-12.7kJ∆W=-67.8kJ

Q: In which form of heat transfer is a medium not required?

A: There are three ways of heat transfer. They are conduction, convection and radiation. Conduction is…

Q: Why is thermal pollution a relative term?

A: Thermal pollution is the thermal energy pumped into the atmosphere, water bodies, etc. by the…

Q: When you take a bath in 185 kg of water, how many kilograms of hot water (60.0°C) and cold water…

A: By condition, Again,

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

A:

Q: An insulated beaker with negligible mass contains liquid water with a mass of 0.265 kg and a…

A:

Q: A 50 KW electric furnace measure 1.2m x 1.0m x 0.8m. When the temperature inside the furnace is 1520…

A:

Q: Suppose 9.30 x 105J of energy are transferred to 2.00 kg of ice at 0°C. What is the energy required…

A:

Q: A person with skin of surface area 1.85 m2 and temperature 30.0°C is resting in an insulated room…

A: Area = 1.85 m2 ambient temperature = 20+273= 293 K

Q: Calculate the amount of heat necessary to change 2.5 kg of ice at 0°C into steam?

A:

Q: How much heat is necessary to raise 30 g of water at 10°C to 62°F?

A:

Q: The average thermal conductivity of the walls (including windows) and roof of a house in the figure…

A: According to given, Total area is given by, A= Area of end walls + Area of ends of attic + Area of…

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

A: Determining Specific Heat

Q: Since all objects emit energy to their surroundings, why don’t the temperatures of all objects…

A: The method of heat transfer which doesn't require any medium is radiation. In radiation, heat is…

Q: A slab of stone of area 0.36 m² and thickness 0.1 is exposed on the lower surface to steam at 100°C.…

A:

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: 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: An aluminumn block, of mass 200 g and a temperature of 400°C, is dropped into an aluminum…

A:

Q: A bulb delivers 25 W of radiant energy when its filament is at 1500 °C . If the temperature…

A:

Q: A platinum ball weighing 100 g is removed from a furnace and dropped into 400 g of water at 0°C. If…

A:

Q: Why heat is called the disordered energy?

A: As the heat energy of a system increases, its entropy will increase. Entropy is a measure of…

Q: Does a body at 0 degree C radiate any heat?

A:

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: A ½ kg ball dropped from a height of 2 m rebounds to only 1.2 m after hitting the ground. The amount…

A: Find the amount of energy converted to heat. ∆E=mg∆h=mgh2-h1

Q: 1 kilogram of boiling water is poured into an empty thermos whose mass is 1 kilogram and whose…

A: The temperature of boiling water is 100o Celsius. The temperature of empty thermos is 25o Celsius.…

Q: How much heat is required to raise 7.9 kg of gold 55°F? (include units with answer)

A:

Q: The rate of heat conduction out of a glass window on a winter day is rapid enough to chill the air…

A: Area of the glass window, A=4.43 m2 The thickness of the glass window, d=0.95 cm The temperature of…

Q: At what temperature will the air in the oven have a thermal energy of 5.0 x 10 J?

A: Thermal energy of the air inside oven (E)=50 J Boltzmann's constant (k)=1.38×10-23 J/K

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: 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: One gram of ice at 0°C is placed on a container containing 2,000,000 cubic meters of water at 0°C.…

A: Given data: ice's mass m = 1 g  Initial temperature Ti = 0 oC final temperature Tf = 0 oC volume of…

Q: How much heat in Calories does it take to raise 2000 g of water by 4.5 Degrees C?

A: The amount of heat required to rise the temperature of water is, Q=mc∆T the specific heat of water…

Q: What determines whether an object is a net absorber or net emitter of radiant energy at given time?

A: All substance above absolute temperature emit radiant energy. Whether the object emits more than it…

Calorimetry

Measuring the heat transferred during chemical reactions or other physical processes is known as calorimetry. It comes under the branch of thermochemistry.