| ⇦ | 
| ⇨ |
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: - Which of the following is an example of ideal black body?
- A particle moving in a straight line covers half the distance with speed of 3 m/s
- Unit of electrical conductivity is
- Two liquid drops having diameters of 1 cm and 1.5 cm. The ratio of excess
- Find the fundamental frequency of a closed pipe if the length of air column is 42m.
Topics: Work Energy and Power
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Which of the following is an example of ideal black body?
- A particle moving in a straight line covers half the distance with speed of 3 m/s
- Unit of electrical conductivity is
- Two liquid drops having diameters of 1 cm and 1.5 cm. The ratio of excess
- Find the fundamental frequency of a closed pipe if the length of air column is 42m.
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