Saved Bookmarks
| 1. |
A particle is shifted from `A` to `B` and then from `B` to `C` where `A`,`B` and `C` are the midpoints of the corresponding faces of a cube of side `2m`. If a force `vec(F)=(3hat(i)+4hat(j)-5hat(k))N` is continously acting on the particle, then select incorrect alternative `:-` A. work done form `A` to `B` is `7J`B. work done from `B` to `C` is `1J`C. work done `A` to `C` is `8J`D. force `vec(F)` is non`-`conservative force . |
|
Answer» Correct Answer - D `vec(OA)=hat(i)+hat(k)`, `vec(OB)=2hat(i)+hat(j)+hat(k)`, `vec(OC)=hat(i)+2hat(j)+hat(k)rArr``vec(AB)=vec(OB)-vec(OA)=hat(i)+hat(j)` `vec(BC)=vec(OC)-vec(OB)=hat(j)-hat(i)`, `vec(AC)=vec(OC)-vec(OA)=2hat(j)` `W_(AB)=vec(F).vec(AB)=7`, `W_(BC)=vec(F).vec(BC)=1` `W_(AC)=vec(F).vec(AC)=8` A constant force is always a conservative force. |
|