A body cools at the rate of `0.75^(@)C//s` when it is `50^(@)C` above the surrounding. Its rate of cooling when it is `30^(@)C` above the same surroun

Question

A body cools at the rate of `0.75^(@)C//s` when it is `50^(@)C` above the surrounding. Its rate of cooling when it is `30^(@)C` above the same surroun

A body cools at the rate of `0.75^(@)C//s` when it is `50^(@)C` above the surrounding. Its rate of cooling when it is `30^(@)C` above the same surrounding is
A. `0.32^(@)C//s`
B. `0.36^(@)C//s`
C. `0.40^(@)C//s`
D. `0.45^(@)C//s`

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - D
`R_(1)=K(theta_(1)-theta_(0))`
`R_(2)=K(theta_(2)-theta_(0))`
`(R_(2)))/(R_(1))=((theta_(2)-theta_(0)))/((theta_(1)-theta_(0)))`
`R_(2)=(0.75xx30)/(50)=0.45^(@)C//s`.

4 views Answered 2023-02-05 15:29