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JEE Mains 2015 Sample Questions › Thermal physics questions › Pls help

1)A solid sphere and a hollow sphere of same material ,size are heated to same temperature and allowed to cool. If temp diff bet body and sphere is t, then
a)Both spheres will cool at same rate
b)hollow faster
c)solid faster

2)A clock having brass is designed to keep accurate time at 20 degc? Wat is mag of error ,will it go faster or slower at 0degc? alpha brass=19x10⁶?

#Physics #Thermal physics

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virang1 Jhaveri ·2009-04-20 22:06:35

1
a)

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Thedarkknight ·2009-04-20 22:12:14

tats wat i thot but answer is c

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Thedarkknight ·2009-04-20 22:14:53

wat abt second ques?any idea?

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kartik sai ·2009-04-20 23:03:25

FOR Q2 WHEN TEMP DECREASES THE LENGTH OF STRING WILL ALSO DECREASE. SO IN THE TIME PERIOD FORMULA 'l' DECREASES SO THE TIME PERIOD OF THE PENDULUM DECREASES SO I THINK THE CLOCK WILL GO FASTER..

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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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