Work that a man will do.

AIEEE Guidance › Mechanics questions › Work that a man will do.

A man pushes a compartment of a train in the direction in which the train is accelerating uniformly. Will the man do +ve ,-ve or no work ?

#Physics #Mechanics

UP 0 DOWN 0 1 35
Post on FacebookPost anonymously?

35 Answers

1
2

13

Ð”Ð²Ò¥Ñ—ÑuÏ now in medical c ·2009-02-12 23:13:08

is n't it no work if inside the train[7]??

UP 0 DOWN 0
Post on FacebookPost anonymously?

62

Lokesh Verma ·2009-02-12 23:42:52

no it is not 0 work if he is inside the train.

UP 0 DOWN 0
Post on FacebookPost anonymously?

1

Grandmaster ·2009-02-12 23:53:02

but then nishant bahiya , isn't the same friction and reaction force acting on the man and hence +ve work is done tby the train on man and hence

the energy of the system is unchanged and in accordance to the statement

"internal forces do not change the energy of the system

UP 0 DOWN 0
Post on FacebookPost anonymously?

13

Ð”Ð²Ò¥Ñ—ÑuÏ now in medical c ·2009-02-13 00:02:01

what work will be done if he is inside??[7]

UP 0 DOWN 0
Post on FacebookPost anonymously?

1

Grandmaster ·2009-02-13 00:07:51

the work done will be f_netx(displacement)

f_net=frictoin (on man)-normal reaction by train wall (on man)

diplacement is fixed =at²

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