3 Fig. 3.1 shows the arm of a crane when it is lifting a heavy box.

Fig. 3.1
(a) By the use of a scale diagram (not calculation) of the forces acting at P, find the weight
of the box. [5]

To find the weight of the box using a scale diagram at point P, we need to use the principle of vector addition. Here's a step-by-step explanation of how to do it:

1. Draw a scale diagram: Start by drawing a clear and accurate diagram of the forces acting on the arm of the crane. Make sure to include all the forces and label them accordingly.

2. Identify the forces: Identify and label all the forces acting at point P. In this case, we are looking for the weight of the box, so we need to identify the force of gravity acting on the box.

3. Draw vectors: Using the scale you have chosen, draw vectors to represent each force. Remember to ensure that the direction and magnitude of each vector accurately represent the corresponding force.

4. Scale the diagram: Scale the diagram appropriately to represent the forces accurately. Make sure all the vectors are proportional when compared to their respective forces.

5. Vector addition: Use vector addition to find the resultant vector at point P. Start by aligning the vectors tip-to-tail and then draw the resultant vector, which represents the sum of all the forces acting at that point.

6. Measure the magnitude: Measure the magnitude of the resultant vector using a ruler or measuring tape. Make sure to use the same scale as the rest of the diagram.

7. Determining the weight: The magnitude of the resultant vector represents the total force at point P, which is the sum of all the forces acting at that point. Since we are looking for the weight of the box, we need to equate this force to the weight of the box.

8. Calculate the weight: Convert the magnitude of the resultant vector to weight units (e.g. kilograms or pounds) based on the scale chosen for the diagram. This will give you the weight of the box.

Follow these steps, and you will be able to find the weight of the box using a scale diagram at point P. Remember to be accurate in drawing and scaling the diagram to get the most precise result.

I do not do magic and also can not solve a problem using a scale diagram that I do not have.

Abay yaar. Scale diagram banana seekh le.

how do you expect him to answer when you dint even give the measurements??