One day in the morning, Ramesh filled up 1/3 bucket of hot water from geyser, to take bath. Remaining 2/3 was to be filled by cold water (at room temperature) to bring mixture to a comfortable temperature. Suddenly Ramesh had to attend to something which would take some times, say 5-10 minutes before he could take bath. Now he had two options:

(i) Fill the remaining bucket completely by cold water and then attend to the work,

(ii) First attend to the work and fill the remaining bucket just before taking bath. Which option do you think would have kept water warmer ? Explain

0 1 View | Posted 4 months ago
Asked by Shiksha User

  • 1 Answer

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    Answered by

    Payal Gupta | Contributor-Level 10

    4 months ago

    This is a short answer type question as classified in NCERT Exemplar

    The first option kept water warmer because according to newton's law of cooling the rate of loss of heat is directly proportional to the difference of temperature of the body and the surroundings and in the first case temperature difference is less. So rate of loss of heat will be less.

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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

R
Raj Pandey

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

R
Raj Pandey

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

= 3 × 5 × 1 0 4 × 8 × 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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