11.16 A child running a temperature of 101°F is given an antipyrin (i.e. a medicine that lowers fever) which causes an increase in the rate of evaporation of sweat from his body. If the fever is brought down to 98°F in 20 minutes, what is the average rate of extra evaporation caused, by the drug. Assume the evaporation mechanism to be the only way by which heat is lost. The mass of the child is 30 kg. The specific heat of human body is approximately the same as that of water, and latent heat of evaporation of water at that temperature is about 580 cal g –1.

0 3 Views | Posted 4 months ago
Asked by Shiksha User

  • 1 Answer

  • P

    Answered by

    Payal Gupta | Contributor-Level 10

    4 months ago

    11.16 Initial body temp of the child,  T1 = 101°F

    Final body temp of the child,  T2 = 98°F

    Change in temperature,  ?  T = T1-T2= (101°F- 98°F) = 3 °F = 59  (3-32) ° C = 1.666 ?

    Time taken t achieve this temperature, t = 20 min

    Specific heat of human body = Specific heat of water, c = 1000 cal/kg/ ?

    Latent heat of evaporation of water, L = 580 cal/g

    Mass of the child, m = 30 kg

    The heat lost by the child is given as ? θ=mc? T = 30 ×1000×1.666 = 49980 cal

    Let m1 be the mass of water evaporated from the child’s body in 20 mins.

    Loss of heat ? θ = m1×L = 580&nbs

    ...more

Similar Questions for you

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

m i c e = 5 × 0 . 3 9 × 5 0 0 3 3 5

= 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

= 1 2 0 × 1 0 3 = 1 . 2 × 1 0 5 c m 3

 

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

Get authentic answers from experts, students and alumni that you won't find anywhere else

Sign Up on Shiksha

On Shiksha, get access to

  • 65k Colleges
  • 1.2k Exams
  • 688k Reviews
  • 1800k Answers

Learn more about...

Share Your College Life Experience

Didn't find the answer you were looking for?

Search from Shiksha's 1 lakh+ Topics

or

Ask Current Students, Alumni & our Experts

×

This website uses Cookies and related technologies for the site to function correctly and securely, improve & personalise your browsing experience, analyse traffic, and support our marketing efforts and serve the Core Purpose. By continuing to browse the site, you agree to Privacy Policy and Cookie Policy.

Need guidance on career and education? Ask our experts

Characters 0/140

The Answer must contain atleast 20 characters.

Add more details

Characters 0/300

The Answer must contain atleast 20 characters.

Keep it short & simple. Type complete word. Avoid abusive language. Next

Your Question

Edit

Add relevant tags to get quick responses. Cancel Post