| ⇦ | 
| ⇨ |
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: - A body travels 200 cm in the first two seconds and 220 cm in the next 4 secs
- If h is planck’s constant and λ is wavelength, h/λ has dimensions of
- If the nucleus ²⁷₁₃Al has nuclear radius of about 3.6 fm
- A projectile is fired from the surface of the earth with a velocity of 5 m s⁻¹ and angle
- A proton is moving in a uniform magnetic field B in a circular path of radius a
Topics: Work Energy and Power
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A body travels 200 cm in the first two seconds and 220 cm in the next 4 secs
- If h is planck’s constant and λ is wavelength, h/λ has dimensions of
- If the nucleus ²⁷₁₃Al has nuclear radius of about 3.6 fm
- A projectile is fired from the surface of the earth with a velocity of 5 m s⁻¹ and angle
- A proton is moving in a uniform magnetic field B in a circular path of radius a
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