very easy bt ans nt matching

IIT JEE 2015 Forum › Mechanics questions › very easy bt ans nt matching

a force -f(k^) acts onthe originof coordinate system .torque abt the point (1,-1)

#Physics #Mechanics

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8 Answers

11

Subash ·2009-04-22 04:13:10

-f(i^+j^)?

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1

Â°áƒ¦â€¢à¹“ÑÏ…Î ·2009-04-22 04:17:05

f(i +j )

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1

ith_power ·2009-04-22 04:20:49

(\hat{-i}+\hat{j})\times(-f\hat{k})

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1

vector ·2009-04-22 04:27:10

i got same as subash bt ans provided is f(i+j)

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11

Subash ·2009-04-22 04:35:32

@Wats in name :P can you explain?

Btw i used what ith_power wrote .Why is that wrong?

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1

Â°áƒ¦â€¢à¹“ÑÏ…Î ·2009-04-22 04:39:19

:D

torque =rxf

r=i -j
f=-k

so take their cross prodduct

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11

Subash ·2009-04-22 04:42:51

isnt r=-i+j

let the point be P
shouldnnt r be PO rather than OP which youve considered?

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9

Celestine preetham ·2009-04-22 06:30:15

ya subash and ithpower are right

ans provided is wrong

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Your Answer

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