To use the shear formula, the internal shear force must be:
1 answer:
Answer:
vertical, and directed along an axis of symmetry of the cross-section
Explanation:
Shear is a force in an object is in the form of stress or strain. Shear strain is the ratio of length of deformation (extension) to the perpendicular length in the plane of the force applied. Shear stress, which is the stress that tends to shear a material, is the ratio of shear force applied on a surface to the area of the surface.
The shear formula can be used to determine the maximum shear in an object and is given by; τ = . It is applicable when the internal shear force is vertical and directed along an axis of symmetry of the cross-section.
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Solution :
The nuclear reaction for boron is given as :
And the reaction for Cadmium is :
We know that it is easier that to shield or stop an alpha particle (i.e. He nucli) as they can be stopped or obstructed by only a few centimetres of the material. However, the gamma rays ( γ ) can penetrate through the material to a greater distance. Therefore, we can choose the first one.