A man is riding a bicycle whose paddle is at a distance of 20cm from the fulcrum .the man can exert the force of 4oN. what is the moment produced on the crank of bicycle when the paddle makes the angle of 1.(90) ° 2(45)° what is the line of action of force?

the force on the thing and the distance the force moves the thing

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west