EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 12 - Thermal Properties of Matter>WBJEE 2019>Q 4

HARD

WBJEE

IMPORTANT

Earn 100

Two identical blocks of ice move in opposite directions with equal speed and collide with each other. What will be the minimum speed required to make both the blocks melt completely, if the initial temperatures of the blocks were $- 8 ° C$ each? (Specific heat of ice is $2100 J {kg}^{- 1} K^{- 1}$ and latent heat of fusion of ice is $3.36 \times 10^{5} J {kg}^{- 1})$

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Important Questions on Thermal Properties of Matter

HARD

WBJEE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 12 - Thermal Properties of Matter>WBJEE 2018>Q 5

The water equivalent of a calorimeter is

10 g

and it contains

50 g

of water at

15 ° C

. Some amount of ice, initially at

- 10 ° C

is dropped in it and half of the ice melts till equilibrium is reached. What was the initial amount of ice that was dropped (when specific heat of ice

= 0.5

cal

{gm}^{- 1} {}^{\circ}C^{- 1},

specific heat of water

= 1.0

cal

{gm}^{- 1 \circ} C^{- 1}

and latent heat of melting of ice

= 80

cal

{gm}^{- 1}

)?