time?????

BITSAT 2015 Papers › Thermal physics questions › time?????

A solid copper (density Ï and specific heat c) of radius r at an initial temperature 200 K is suspended inside a chamber whose walls are at almost 0 K.What is the time required for the temperature of sphere to drop to 100K

#Physics #Thermal physics

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eureka123 ·2009-02-08 00:06:07

i month gone,...........when will reply come??????????????/

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tapanmast Vora ·2009-02-08 00:32:53

THE TIME HAS CUM..... LOL.........

WATS DA ANS????????/

IS IT 100/150?????????

MAYBE I M MISSIN A FACTOR K????

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tapanmast Vora ·2009-02-08 07:38:09

WATS DA ANS DUDE??

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eureka123 ·2009-02-08 11:09:23

the answer is very astonishing..........7rlc*10^-6/72eÏƒ

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iitimcomin ·2009-02-13 19:52:43

ok so dQ/dt = eÏƒ(4Ï€r^2)(T^4 - 0^4)= d(mc (200-T))/dt..............integrate T from 200 to 100 and time from 0 to t ..............

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Basic Integral Calculus Operators Symbols Matrix Cases

√ √ || {} [] () → ~ ^ x x x → → ln log lg lim lim cos sin tan cot arcsin arccos arctan

∫ ∫ ∫ ∫ ∫ ∬ ∬ ∬ ∬ ∬ ∭ ∭ ∭ ∭ ∭ ⨌ ⨌ ⨌ ⨌ ⨌

∑ ∑ ∑ ∑ ∑ ∮ ∮ ∮ ∮ ∮ ∏ ∏ ∏ ∏ ∏ ∐ ∐ ∐ ∐ ∐

+ - × ÷ ± ∓ = ∪ ∩ ≠ ∼ ≈ ∅ ∀ ∃ ∈ ∋ ∝ ≤ ≥ ≃ ≅ ≡ < > ≪ ≫ ⊂ ∉ ⊃ ⊆ ⊇ ⇒ ⇐ ⇔ ⇒ ⇐ ⇔ ⇑ ⇓ ⇕ → ← ↔ → ← ↔ ↑ ↓ ↕ ↖ ↗ ↘ ↙ ↪ ↩ ⇀ ↼ ⇁ ↽

° ∂ ∞ α β γ δ θ λ μ ν ξ π ρ σ φ ω ε ƒ κ τ υ Γ Δ Λ Σ Π Ω

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time?????

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