| ⇦ | 
| ⇨ |
A uniform force of (3i + j) newton acfs on a particle of mass 2kg. The particle is displaced from position (2i + k) meter to position (4i + 3j – k) meter. The work done by the force on the particle is
Options
(a) 6 J
(b) 13 J
(c) 15 J
(d) 9 J
Correct Answer:
9 J
Explanation:
Given : F⃗ = 3i + j
r⃗₁ = (2i + k), r⃗₂ = (4i + 3j – k⃗)
r⃗ = r⃗₂ – r⃗₁ = (4i + 3j – k⃗) – (2i + k)
or r⃗ = 2i + 3j – 2k
so, work done by the given force w = f⃗ . r⃗
= (3i + j) x (2i + 3j – 2k) = 6 + 3 = 9 J
Related Questions: - If the unit of force and length are doubled, then unit of energy will be
- A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth
- A n-p-n transistor is connected in common emitter configuration in a given amplifier.
- A long straight wire is carrying a current of 12 A. The magnetic field at a distance
- Two wheels having radii in the ratio 1:3 are connected by a common belt
Topics: Work Energy and Power
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If the unit of force and length are doubled, then unit of energy will be
- A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth
- A n-p-n transistor is connected in common emitter configuration in a given amplifier.
- A long straight wire is carrying a current of 12 A. The magnetic field at a distance
- Two wheels having radii in the ratio 1:3 are connected by a common belt
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