CBSE Class 11-science Answered
Slove the questions
![question image](https://images.topperlearning.com/topper/new-ate/topr_3723303451464534520190913121345.jpeg)
Asked by arya7117aman | 13 Sep, 2019, 12:18: PM
Force = 10i - 3j + 6k
Initial position = 6i + 5k - 3k
Final position = 10i - 2j +7k
We know, Work done,
![W space equals F with rightwards arrow on top. space d with rightwards arrow on top space](https://images.topperlearning.com/topper/tinymce/cache/2d8a335218df180f6aa2ef66f75decb7.png)
Let us first calculate displacement.
Displacement is nothing but the difference between the final position and initial position.
Thus,
![d space equals space space open parentheses 10 i with hat on top space minus space 2 j with hat on top space plus space 7 k with hat on top space close parentheses space minus open parentheses space 6 i with hat on top space plus space 5 k with hat on top space minus space 3 k with hat on top close parentheses space equals space open parentheses 4 stack i space with hat on top minus space 7 j with hat on top space plus 10 k with hat on top close parentheses space
T h u s comma space
W o r k space d o n e comma space W space equals space open parentheses 10 i with hat on top space minus space 3 j with hat on top space plus space 6 k with hat on top space close parentheses. open parentheses 4 stack i space with hat on top minus space 7 j with hat on top space plus 10 k with hat on top close parentheses
therefore W space equals space left parenthesis 10 cross times 4 right parenthesis plus open parentheses left parenthesis negative 3 right parenthesis cross times left parenthesis negative 7 right parenthesis close parentheses plus open parentheses 6 cross times 10 close parentheses space equals space 40 space plus 21 plus 60 space equals space 121 space J space](https://images.topperlearning.com/topper/tinymce/cache/aae76dbf28f52daf639464924c6a1120.png)
Thus, work done = 121 J
Answered by Shiwani Sawant | 13 Sep, 2019, 14:19: PM
Concept Videos
CBSE 11-science - Physics
Asked by manjusrihalder395 | 07 Jan, 2024, 21:55: PM
CBSE 11-science - Physics
Asked by spandya632 | 17 Nov, 2023, 08:36: AM
CBSE 11-science - Physics
Asked by hy9022075 | 10 Jan, 2023, 21:06: PM
CBSE 11-science - Physics
Asked by ad4957216 | 03 Jan, 2023, 16:54: PM
CBSE 11-science - Physics
Asked by prashantgaikwadfox000 | 25 Sep, 2022, 17:38: PM
CBSE 11-science - Physics
Asked by ukalyadab | 18 Jul, 2022, 11:52: AM
CBSE 11-science - Physics
Asked by piyushhoney2006 | 20 Jun, 2022, 16:12: PM
CBSE 11-science - Physics
Asked by chinttubabu9692 | 27 Jan, 2022, 18:37: PM