A sphere, a cube and a thin circular plate, all of same material and same mass are initially heated to same high temperature.

(a) Plate will cool fastest and cube the slowest

(b) Sphere will cool fastest and cube the slowest

(c) Plate will cool fastest and sphere the slowest

(d) Cube will cool fastest and plate the slowest.

0 2 Views | Posted 4 months ago
Asked by Shiksha User

  • 1 Answer

  • P

    Answered by

    Payal Gupta | Contributor-Level 10

    4 months ago

    This is a multiple choice answer as classified in NCERT Exemplar

    (c) density = mass/volume as density is same so volume is also same.

    According to Stefan’s law H AT4  where A is the area and T is the temperature

    Hsphere:Hcube:Hplate= Asphere:Acube:Aplate

    As Aplate is maximum.

    Hence the plate will cool the fastest.

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A
alok kumar singh

According to question, we can write

d = d 0 ( 1 + α Δ T ) 6 . 2 4 1 = 6 . 2 3 0 ( 1 + 1 . 4 × 1 0 5 × Δ T )

T = 1 2 6 . 1 8 + 2 7 = 1 5 3 . 1 8 ° C

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Heat Released by block = Heat gain by large Ice block

m c Δ T = M i c e L

5 × 0.39 × 500 = mice × 335

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= 2.91 kg

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Given

6a2 = 24

a2 = 4

a = 2m

Δ v = v ( γ ) Δ T

= 3 α v Δ T

= 3 × 5 × 1 0 4 × ( a 3 ) × 1 0

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P
Payal Gupta

This is a multiple choice answer as classified in NCERT Exemplar

(b), (c), (d) When the hot milk in the table is transferred to the surroundings by conduction, convection and radiation.

According to newton's law of cooling temperature of the milk falls of exponentially. Heat also will be transferred from surroundings to the milk but will be lesser than that of transferred from milk to surroundings. So option b, c, d satisfy.

P
Payal Gupta

This is a multiple choice answer as classified in NCERT Exemplar

(a), (d) During the process AB temperature of the system is 00C . hence it represents phase change that is transformation of ice into water while temperature remains 00C.

BC represents rise in temperature of water from 00C to 1000C. now water starts converting into steam which is represented by CD.

Which is only represents by a, d options

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