Question

12.
lines?
If a particle is displaced from (1,1,1) to (2,2,2), then find the angle that the
displacement vector makes with the +ve x axis.​

Answer 1

Answer:

The vector at point A(−1,2) is

r

1

=−

i

^

+2

j

^

The vector at point B(1,2) is

r

2

=

i

^

+2

j

^

Displacement vector,

r

=

r

2

−

r

1

r

=(

i

^

+2

j

^

)−(−

i

^

+2

j

^

)

r

=2

i

^

Force,

F

=4

i

^

N

The work done by the force,

W=

F

.

r

W=(4

i

^

).(2

i

^

)=8cos0

0

W=8J