MEDIUM

JEE Advanced

IMPORTANT

Earn 100

A lead bullet penetrates into a solid object and melts. Assuming that $50 %$ of its kinetic energy was used to heat it, calculate the initial speed of the bullet. The initial temperature of the bullet is $27 ° C$ and its melting point is $327 ° C$ . Latent heat of fusion of lead $= 2.5 \times 10^{4} J {kg}^{- 1}$ and specific heat capacity of lead $= 125 J {kg}^{- 1} K^{- 1}$ .

Important Questions on Calorimetry and Heat Transfer

MEDIUM

JEE Advanced

IMPORTANT

Understanding Physics JEE Main & Advanced WAVES AND THERMODYNAMICS>Chapter 6 - Calorimetry and Heat Transfer>Exercises>Q 11

A ball is dropped on a floor from a height of

v^{2} = 4 \times 62500

. After the collision, it rises up to a height of

1.5 m

. Assume that

40 %

of the mechanical energy lost goes as thermal energy into the ball. Calculate the rise in the temperature of the ball in the collision. The specific heat of the ball is

800 J K^{- 1}

[Take

g = 10 m s^{- 2}

MEDIUM

JEE Advanced

IMPORTANT

Understanding Physics JEE Main & Advanced WAVES AND THERMODYNAMICS>Chapter 6 - Calorimetry and Heat Transfer>Exercises>Q 1

A ball is dropped on a floor from a height of

2.0 m

. After the collision, it rises up to a height of

1.5 m

. Assume that

40 %

of the mechanical energy lost goes as thermal energy into the ball. Calculate the rise in the temperature of the ball in the collision. The specific heat of the ball is

800 J K^{- 1}

EASY

JEE Advanced

IMPORTANT

Understanding Physics JEE Main & Advanced WAVES AND THERMODYNAMICS>Chapter 6 - Calorimetry and Heat Transfer>Exercises>Q 2

A nuclear power plant generates

500 MW

of waste heat that must be carried away by water pumped from a lake. If the water temperature is to rise by

10 ° C

, what is the required flow rate in

kg s^{- 1}

EASY

JEE Advanced

IMPORTANT

Understanding Physics JEE Main & Advanced WAVES AND THERMODYNAMICS>Chapter 6 - Calorimetry and Heat Transfer>Exercises>Q 3

The emissivity of tungsten is

0.4

. A tungsten sphere with a radius of

4.0 cm

is suspended within a large evacuated enclosure whose walls are at

300 K

. What power input is required to maintain the sphere at a temperature of

3000 K

, if heat conduction along the supports is neglected? Take

σ = 5.67 \times 10^{- 8} W m^{- 2} K^{- 4}

EASY

JEE Advanced

IMPORTANT

Understanding Physics JEE Main & Advanced WAVES AND THERMODYNAMICS>Chapter 6 - Calorimetry and Heat Transfer>Exercises>Q 4

A pot with a steel bottom

1.2 cm

thick, rests on a hot stove. The area of the bottom of the pot is

0.150 m^{2}

. The water inside the pot is at

100 ° C

and

0.440 kg

are evaporated every

5.0 \min

. Find the temperature of the lower surface of the pot which is in contact with the stove. Take

L_{v} = 2.256 \times 10^{6} J {kg}^{- 1}

and

k_{steel} = 50.2 W m^{- 1} K^{- 1}

EASY

JEE Advanced

IMPORTANT

Understanding Physics JEE Main & Advanced WAVES AND THERMODYNAMICS>Chapter 6 - Calorimetry and Heat Transfer>Exercises>Q 5

A carpenter builds an outer house wall with a layer of wood

2.0 cm

thick on the outside and a layer of an insulation

3.5 cm

thick as the inside wall surface. The wood has

K = 0.08 W m^{- 1} K^{- 1}

and the insulation has

K = 0.01 W m^{- 1} K^{- 1}

. The interior surface temperature is

19 ° C

and the exterior surface temperature is

- 10 ° C

.
(a) What is the temperature at the plane where the wood meets the insulation?
(b) What is the rate of heat flow per square metre through this wall?

EASY

JEE Advanced

IMPORTANT

Understanding Physics JEE Main & Advanced WAVES AND THERMODYNAMICS>Chapter 6 - Calorimetry and Heat Transfer>Exercises>Q 6

A closed thermally insulated vessel contains

100 g

of water at

0 ° C

. If air from this vessel is rapidly pumped out, intensive evaporation will produce cooling and as a result of this, water freezes. How much ice will be formed by this method, if latent heat of fusion is

80 cal g^{- 1}

and of evaporation

560 cal g^{- 1}

MEDIUM

JEE Advanced

IMPORTANT

Understanding Physics JEE Main & Advanced WAVES AND THERMODYNAMICS>Chapter 6 - Calorimetry and Heat Transfer>Exercises>Q 7

In a container of negligible mass,

140 g

of ice, initially at

- 15 ° C

, is added to

200 g

of water that has a temperature of

40 ° C

. If no heat is lost to the surroundings, what is the final temperature of the system and masses of water and ice in the mixture?

Important Questions on Calorimetry and Heat Transfer

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