Question

calculate the work done when a force f = 37+2j-2k produces a [ans.: 8 unit] characteristics lacing a body d during the rs. state righ rection of the actors. + kb, then displacement r = 4i + j + 3k

Answer 1

Answer:

The body is displaced from

r

1

to

r

2

.

Therefore, displaeement of the body is,

s

=

r

2

−

r

1

=(

i

^

+

j

^

+

k

^

)−(2

i

^

+3

j

^

+

k

^

)=(−

i

^

−2

j

^

)m

Now, work done by the force is:

W=

F

⋅

s

=(2

i

^

+3

j

^

+4

k

^

)⋅(−

i

^

−2

j

^

)

=(2)(−1)+(3)(−2)

=−8J