| ⇦ | 
| ⇨ |
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 damping force on an oscillator is directly proportional to the velocity.
- A ballet dancer, dancing on smooth floor, is spinning about a vertical axis
- A thin film of soap solution (n=1.4) lies on the top of a glass plate (n=1.5).
- A battery having e.m.f. 4 volt and internal resistance 0.5 Ω is connected
- Across a metallic conductor of non-uniform cross-section, a constant potential
Topics: Work Energy and Power
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The damping force on an oscillator is directly proportional to the velocity.
- A ballet dancer, dancing on smooth floor, is spinning about a vertical axis
- A thin film of soap solution (n=1.4) lies on the top of a glass plate (n=1.5).
- A battery having e.m.f. 4 volt and internal resistance 0.5 Ω is connected
- Across a metallic conductor of non-uniform cross-section, a constant potential
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