A uniform force of (3i + j) newton acfs on a particle of mass 2kg

A Uniform Force Of 3i J Newton Acfs On Physics Question

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:

  1. Consider the following two statements about Kirchhoff’s law
  2. Huygen’s principle of secondary wavelets may be used to
  3. The velocity of sound is V, in air. If the density of air is increased to four times
  4. The angle of a prism is A. One of its refracting surfaces is silvered
  5. Three particles A,B and C are thrown from the top of a tower with the same speed.

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.

NEETLab Mobile App

Share this page with your friends

Be the first to comment

Leave a Reply

Your email address will not be published.


*