(b) Fig. 3.1 shows a diagram of an arm with the hand holding a weight of 120N. 2 cm 1 1 P 15 cm V20N 120N 33 cm Fig. 3.1 The 20 N force is the weight of the forearm, acting at its centre of mass. F is the force in muscle of the upper arm. P is the point in the elbow about which the arm pivots. The distan of the forces from point P are shown. (i) By taking moments about point P, calculate the force F.

Iwould say a is accurate

What the heck r u talkin bout? ?

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.