| ⇦ | 
| ⇨ |
A body of mass 3 kg acted upon by a constant force is displaced by S meter, given by relation S=1/3t², where t is in second. Work done by the force in2 seconds
Options
(a) 8/3 J
(b) 19/5 J
(c) 5/19 J
(d) 3/8 J
Correct Answer:
8/3 J
Explanation:
S = (1/3) t²; v = dS / dt = (2/3) t
a = d²S / dt² = 2/3
F = ma = 3 × (2/3) = 2N
Work = 2 × (1/3) t²
At t = 2 seconds
.·. Work = 2 × (1/3) × 2 × 2 = (8/3) J
Related Questions: - A wire of length 1 m is placed in a uniform magnetic field of 1.5 tesla at an angle
- The velocity of electromagnetic radiation in a medium of permittivity ε₀
- The magnifying power of a convex lens of focal length 10 cm, when the image
- A plane polarised light is incident normally on a tourmaline plate. Its E vector make
- A source is moving towards an observer with a speed of 20 m/s and having frequency
Topics: Work Energy and Power
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A wire of length 1 m is placed in a uniform magnetic field of 1.5 tesla at an angle
- The velocity of electromagnetic radiation in a medium of permittivity ε₀
- The magnifying power of a convex lens of focal length 10 cm, when the image
- A plane polarised light is incident normally on a tourmaline plate. Its E vector make
- A source is moving towards an observer with a speed of 20 m/s and having frequency
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