| ⇦ | 
| ⇨ |
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: - The conductivity in the intrinsic semiconductor does not depend on
- A point source emits sound equally in all directions in a non-absorbing medium.
- There are four light-weight-rod samples A,B,C,D seperately suspended by threads
- Which two of the following five physical parameters have the same dimensions?
- The angular momentum of an electron is J. The magnitude of the magnetic moment
Topics: Work Energy and Power
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The conductivity in the intrinsic semiconductor does not depend on
- A point source emits sound equally in all directions in a non-absorbing medium.
- There are four light-weight-rod samples A,B,C,D seperately suspended by threads
- Which two of the following five physical parameters have the same dimensions?
- The angular momentum of an electron is J. The magnitude of the magnetic moment
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