The power required to exert 4-n force over 3 meters in 2 seconds is

a) 4 w.
b) 6 w.
c) 8 w.
d) 12 w.
e) none of the above

B) 6 W

Explanation:

First of all, we need to find the work done by the force. This is given by

where

F = 4 N is the magnitude of the force

d = 3 m is the distance through which the force is applied

Substituting,

Now we can find the power, which is given by

where

W = 12 J is the work done by the force

t = 2 s is the time taken

Substituting,

specific latent heat of fusion, lf, of a substance is defined as the amount of heat required to change a unit mass of the substance from solid to liquid state, without any change in the temperature.

explanation:

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this