Question

An ice berg is displaced against water current by d=15i-12j if water apply a force F=210i-150j Newtown on ice find the work done in displacing ice​

Answer 1

Explanation:

We find the work done by the water on the ice block:

W=

F

.

d

$$= \Big[ (210 N) \hat{i} - (150 N) \hat{j}\Big].\Big[ (15m)\hat{i} - (12 m) \hat{j} \Big]

$$= (210 N)(15 m) + (-150 N) (-12 m)

=5.0×10

3

J.