Home
Class 12
PHYSICS
Two identical blocks of ice move in oppo...

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 `Jkg^(-1)K^(-1)` and Latent heat of fusion of ice is `3.36 xx 10^5 Jkg^(-1)`)

A

`840 ms^(-1)`

B

`420 ms^(-1)`

C

`8.4 ms^(-1)`

D

`84 ms^(-1)`

Text Solution

Verified by Experts

Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • QUESTION PAPER 2019

    WB JEE PREVIOUS YEAR PAPER|Exercise PHYSICS (CATEGORY -III)|3 Videos

  • QUESTION PAPER 2019

    WB JEE PREVIOUS YEAR PAPER|Exercise PHYSICS (CATEGORY -III)|3 Videos

  • QUESTION PAPER 2018

    WB JEE PREVIOUS YEAR PAPER|Exercise PHYSICS|40 Videos

  • QUESTION PAPER 2021

    WB JEE PREVIOUS YEAR PAPER|Exercise PHYSICS (CATEGORY -II)|6 Videos

Similar Questions

Explore conceptually related problems

Two billiard balls each of mass 0.05 kg moving in opposite directions with speed 6 m s^(-1) collide and rebound with the same speed. What is the impulse imparted to each ball due to the other ?

10g of water at 30^(@)C and 5g of ice at -20^(@) C are mixed together in a calorimeter. What is the final temperature of the mixture? Given specific heat of ice= 0.5 cal g^(-1) (""^(0)C)^(-1) and latent heat of fusion of ice =80 cal g^(-1)

A lead bullet melts on hitting a fixed target. What will be the minimum speed of the bullet, if it is assumed that the heat produced is retained entirely by the bullet? Initial temperature of the bullet = 47.6^(@)C , specific heat of lead = 0.03 cal cdot g^(-1) cdot^(@)C^(-1) , melting point of lead = 327^(@)C , latent heat of fusion of lead = 6 cal cdot g^(-1) , J = 4.2 xx 10^(7) erg cdot cal^(-1) .

A copper block of mass 2.5 kg ts heated in a furnace to a temperature of 500 ^(@) C and then placed on a large ice block. What is the maximum amount of ice that can melt? (Specific heat of copper = 0.39 J g^(-1) K^(-1), " heat of fusion of water " = 335 J g^(-1)) .

5 gm of ice at -10^@C are mixed with 20 gm of water at 39^@C . Will whole of the ice melt? If so, what is the final temperature of the mixture? Specific heat capacity of ice = 0.5 cal gm^-1 "^@C^-1 and latent heat of fusion of ice = 80 cal gm^-1 , specific heat capacity of water = 1cal gm^-1 "^@C^-1 .

A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500^@C and then placed on a large ice block. What is the maximum amount of ice that can melt? Specific heat of copper is 0.39 J gm^-1 "^@C^-1 , Heat of fusion of ice = 335 J gm^-1 .

How much heat is required to rise temperature from -8^@C to 50^@C of 10gm ice. Specific heat of ice 0.5 calorie gm ^-1^@C^ - 1 .

Find out the minimum height from which a piece of ice should be dropped to the ground so that it melts completely. Assume that 20% of energy is lost. J = 4.2 xx 10^(7) erg cdot cal^(-1) and latent heat of fusion of ice = 80 cal cdot g^(-1) .

Find out the minimum height from which a piece of ice at 0^(@)C should be dropped so that it melts completely. Assume that 50% of the energy lost due to its fall is responsible for the fusion of ice. J = 4.2 xx 10^(7) erg cdot cal^(-1) , latent heat of fusion of ice = 80 cal cdot g^(-1) .

Two pieces of ice, of equal mass and moving towards each other with the same velocity, collide head on and are vaporised due to this collision. Find out the minimum initial velocity of the pieces of ice. Given, initial temperature, specific heat and latent heat of fusion of ice are -12^(@)C, 0.5 cal cdot g^(-1) cdot^(@)C^(-1) and 80cal cdot^(@)g^(-1) respectively, latent heat of steam is 540 cal cdot g^(-1) .

Home
Profile