| ⇦ | 
| ⇨ |
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
Related Questions: - If the volume of a block of aluminium is decreased by 1%, the pressure
- If the wavelength of light in vacuum be, the wavelength in a medium of refractive index
- 64 drops of mercury, each charged to a potential of 10 V, are combined
- The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma
- Two lenses of power 15 D and -3 D are placed in contact.
Topics: Work Energy and Power
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If the volume of a block of aluminium is decreased by 1%, the pressure
- If the wavelength of light in vacuum be, the wavelength in a medium of refractive index
- 64 drops of mercury, each charged to a potential of 10 V, are combined
- The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma
- Two lenses of power 15 D and -3 D are placed in contact.
Topics: Work Energy and Power (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply