| ⇦ | 
| ⇨ |
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: - When an object is placed 40cm from a diverging lens, its virtual image is formed 20 cm
- A person wants a real image of his own, 3 times enlarged. Where should he stand
- X-rays when incident on a metal
- The photoelectric threshold wevelength for potassium (work function being 2 eV) is
- The magnetic susceptibility does not depend upon the temperature in
Topics: Work Energy and Power
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When an object is placed 40cm from a diverging lens, its virtual image is formed 20 cm
- A person wants a real image of his own, 3 times enlarged. Where should he stand
- X-rays when incident on a metal
- The photoelectric threshold wevelength for potassium (work function being 2 eV) is
- The magnetic susceptibility does not depend upon the temperature in
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