InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
(a) Write an expression for the change in momentum of a body of mass m moving with velocity v if (i) v ≪ c and (ii) v ⟶ c.(b) State the condition when the change in the momentum of a body depends only on the change in its velocity. |
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Answer» (i) When v <c, Δp = mΔv. (ii) When v → c, the change in momentum is Δp = Δ(mv) If velocity v of the moving body is much smaller than the velocity of light c (v < c) |
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| 2. |
Calculate the acceleration produced in a body of mass 50g when acted upon by a force of 20 N. |
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Answer» Mass= 50g= 0.05kg Force, F= 20N Force = mass x acceleration = ma a = F/m = 20/0.05 = 400ms-2 |
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| 3. |
A vehicle is acted upon by a force of 120kgf. If the mass of vehicle is 80kg. What is the acceleration of the vehicle? [take g = 10ms-2] |
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Answer» Force = 120kgf = 120 x 10N mass = 80kg ∴ acc. a = f/m = 1200/80 = 15ms-2 |
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| 4. |
How much acceleration will be produced in a body of mass 10kg acted upon by a force of 2kgf? [g = 9.8ms-2] |
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Answer» Here m = 10kg a = ? F = 2kgf F = 2 x 9.8 = 19.6N F = ma ∴ a = f/m = 19.6/10 = 1.96ms-2 |
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| 5. |
State the principal of moments. Give one device as application of it. |
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Answer» According to the principle of moments, if the algebraic sum of moments of all the forces acting on the body about the axis of rotation is zero, the body is in equilibrium. A physical balance (or beam balance) works on the principle of moments. |
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