Laws of Motion doubt!

JEE Advanced Questions › Mechanics questions › Laws of Motion doubt!

Q. A boy with a mass of 70kg is standing on a bathroom scale in a lift which is accelerating upwards at 3m/s². Calculate the resultant force on the boy.

Ans: 210 N

Shouldn't the resultant force be 910 N?

#Physics #Mechanics

UP 0 DOWN 0 0 4
Post on FacebookPost anonymously?

4 Answers

Ashish Kothari ·2010-09-10 21:07:13

I realised the mistake as soon as I posted the question. lol! Thanks .. =D

UP 0 DOWN 0
Post on FacebookPost anonymously?

Subhomoy Bakshi ·2010-09-10 22:16:48

btw whom are u thanking?

even i was mislead by the question

and that is due to our bad habit of reading half the question and speculating what the rest half of the question might be...

on looking carefully i saw the word resultant force not reaction force(normal reaction) :P

UP 0 DOWN 0
Post on FacebookPost anonymously?

Ashish Kothari ·2010-09-10 23:03:47

same mistake here! :D

UP 0 DOWN 0
Post on FacebookPost anonymously?

AKHIL ·2010-09-11 00:39:19

yup
same here as well!!!!:P:P

UP 0 DOWN 0
Post on FacebookPost anonymously?

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

Close [X]

Laws of Motion doubt!

4 Answers

Your Answer

Add Image

Similar Questions