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A particle of mass m is driven by a machine that delivers a constant power k watts.If the particle starts from rest the force on the particle at time t is
Options
(a) √(mk/2) t⁻¹/²
(b) √(mk) t⁻¹/²
(c) √2mk t⁻¹/²
(d) 1/2√(mk) t⁻¹/²
Correct Answer:
√(mk/2) t⁻¹/²
Explanation:
As we know power P = dw / dt
w = Pt = (1/2) mV²
So, v = √(2Pt / m)
Hence, acceleration a = dV / dt = √(2P / m).(1/2√t)
Therefore, force on the particle time ‘t’ = ma
= √(2Km² / m) . (1/2√t) = √(Km / 2t) = √(mK / 2) t⁻¹/₂
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Topics: Work Energy and Power
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A ball rolls without slipping. The raidus of gyration of the ball about an axis
- A particle is released from rest from a tower of height h, i.e,t₁ : t₂ : t₃ is
- The resistance of a carbon resistor of colour code Red-Red Green Silver is(in kΩ)
- Two cells, having the same e.m.f. are connected in series through an external resistance
- An object placed at 20 cm in front of a concave mirror produces three times
Topics: Work Energy and Power (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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