Home
Class 12
PHYSICS
Two uniform solid spheres made of copper...

Two uniform solid spheres made of copper have radii 15 cm and 20 cm respectively. Both of them are heated to a temperature of `70^(@)C` and then placed in a region of ambient temperature equal to `45^(@)C` . What will be the ratio of the initial rates of cooling of both the spheres?

Text Solution

Verified by Experts

The correct Answer is:
1.33
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • JEE MOCK TEST 7

    NTA MOCK TESTS|Exercise PHYSICS - Subjective Numerical|5 Videos

  • JEE MOCK TEST 6

    NTA MOCK TESTS|Exercise PHYSICS|25 Videos

  • JEE MOCK TEST 8

    NTA MOCK TESTS|Exercise PHYSICS|25 Videos

Similar Questions

Explore conceptually related problems

A and B are two sphere made of same material. Radius of A is double that of B and initially they are at same temperature (T). Both of them are kept far apart in a room at temperature T_(0)(lt T) . Calculate the ratio of initial rate of cooling (i.e. rate of fall of temperature) of sphere A and B if (a) the spheres are solid, (b) the spheres are hollow made of thin sheets of same thickness

Two metallic spheres S_1 and S_2 are made of the same material and have got identical surface finish. The mass of S_1 is thrice that of S_2 . Both the spheres are heated to the same high temperature and placed in the same room having lower temperature but are thermally insulated from each other. the ratio of the initial rate of cooling of S_1 to that of S_2 is (a)1/3 (b)1/(sqrt3) (c) (sqrt3)/1 (d) (1/3)^(1/3)

Knowledge Check

  • Two solid sphere of copper have radii 10 cm and 8 cm respectively. Their temperature are 227^(@)C and 127^(@)C respectively they are allowed to cool by radiation in a room of temperature 27^(@)C then the initial rates of heat los are in the ratio

    A
    `(85)/(14)`
    B
    `(34)/(7)`
    C
    `(7)/(34)`
    D
    `(14)/(85)`

  • Two sphere of copper of diameters 10 cm and 20 cm will have thermal capacities in the ratio

    A
    `(1)/(8)`
    B
    `(1)/(2)`
    C
    `(1)/(4)`
    D
    `(1)/(6)`

  • Two copper spheres of radii 6 cm and 12 cm respectively are suspended in an evacuated. Each of them is at a temperature 15^(@)C above the surroundings. The ratio of their of loss of heat is

    A
    `2 : 1`
    B
    `1 : 4`
    C
    `1 : 8`
    D
    `8 : 1`

    • Similar Questions

    Explore conceptually related problems

    Two liquids are at temperatures 20^@C and 40^@C . When same mass of both of them is mixed, the temperature of the mixture is 32^@C . What is the ratio of their specific heats?

    Two copperr spheres of radii 6 cm and 12 cm respectively are suspended in an evacuated enclosure. Each of them are at a temperature 15^(@)C above the surroundings. The ratio of their rate of loss of heat is

    Two metallic spheres A and B are made up of same material and also have identical surfaces. Both spheres are heated to same temperature and are then placed in a chamber which is at a lower temperature, thermally insulated from each other. If ratio of masses of A and B is 3:1, then the ratio of their initial rate of cooling is

    A solid cube and a sphere are made of the same material and both have the same surface area. If both are at the temperature of 300 K then initial

    Two spheres P and Q , of same colour having radii 8cm and 2cm are maintained at temperatures of 127^(@)C . If temperature is increased to 927^(@)C , then it radiates energy at the rate of

    Home
    Profile