hi can u please answer question 7 on the image I have attached thank you OleksandrAll Me29/07/2021, 11:13 a.m.Introduction to momentsO A uniform plank has length 6m and mass 40 kg. It is placed on horizontalground at the edge of a vertical river bank, so that 1.5 m of the plank isprojecting over the edge, as shown in Figure 8.27.6m1.5mFigure 8.27How far can a man of mass 70 kg walk along the plank without tipping it?6 Two young children of mass 30 kg and 35 kg sit at the ends of a see-sawEach child is 2.5 m from the fulcrum. Their father whose mass is 75 kg joinsthem. Where must he sit in order for the see-saw to balance?O A light rod, 2m long is hanging horizontally supported by vertical strings ateach end. The maximum tension which the strings can exert is 80 N.A lamina is a flatobject that hasnegligible thicknesscompared with itsength and widthAlong what range of positions on the rod is it safe to hang a 10kg mass,O A sign consists of a uniform rectangular lamina of weight 50 N. It issuspended in equilibrium in a vertical plane by vertical light chainsattached to the sign at the points A and B, with AB horizontal, as shownin Figure 8.28.0.45 m0.15mAB.Figure 8.28li) Draw a diagram showing all the forces acting on the sign.lii) Find the tensions in the chains.® AB represents a uniform horizontal shelf of weight 30N which is supportedat X and Y. Blocks are placed along the shelf, as shown in Figure 8.29.30 cm120 cm30 cm60 cm2 kg3 kg5 kgA45 cm135 cmFigure 8.29i)Find the reaction forces of the supports on the shelf at X and Y.li What is the greatest mass of an object which can be placed at Dwithout the shelf tipping?

Answered: Image /qna-images/answer/a67661ae-b6a6-45e1-90c4-c7f387fe8603.jpg

A sign consists of a uniform rectangular lamina of weight 50 N. It is suspended in equilibrium in a vertical plane by vertical light chains attached to the sign at the points A and B, with AB horizontal, as shown in Figure 8.28. 0.45 m 0.15m A B. Figure 8.28 li Draw a diagram showing all the forces acting on the sign. lii) Find the tensions in the chains.

A sign consists of a uniform rectangular lamina of weight 50 N. It is suspended in equilibrium in a vertical plane by vertical light chains attached to the sign at the points A and B, with AB horizontal, as shown in Figure 8.28. 0.45 m 0.15m A B. Figure 8.28 li Draw a diagram showing all the forces acting on the sign. lii) Find the tensions in the chains.

Elements Of Electromagnetics

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ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Engineering Drawing

Technical drawing has been around since ancient times. As in the ancient Renaissance, complicated drawings were created, including Leonardo da Vinci's drawing. Modern engineering drawing, including its specific orthographic projection with scale conventions, began in Europe (France) during the early stages of Industrialization. L.T. C. Rolt also made some of Marc's drawings for its block-making machinery (in 1799) that also may have contributed significantly to British engineering technology. Since he learned the art of presenting three-dimensional(3D) items in a two-dimensional(2D) plane, as we now term mechanical drawing. 

Question

hi can u please answer question 7 on the image I have attached

thank you

Oleksandr
All Me
29/07/2021, 11:13 a.m.
Introduction to moments
O A uniform plank has length 6m and mass 40 kg. It is placed on horizontal
ground at the edge of a vertical river bank, so that 1.5 m of the plank is
projecting over the edge, as shown in Figure 8.27.
6m
1.5m
Figure 8.27
How far can a man of mass 70 kg walk along the plank without tipping it?
6 Two young children of mass 30 kg and 35 kg sit at the ends of a see-saw
Each child is 2.5 m from the fulcrum. Their father whose mass is 75 kg joins
them. Where must he sit in order for the see-saw to balance?
O A light rod, 2m long is hanging horizontally supported by vertical strings at
each end. The maximum tension which the strings can exert is 80 N.
A lamina is a flat
object that has
negligible thickness
compared with its
ength and width
Along what range of positions on the rod is it safe to hang a 10kg mass,
O A sign consists of a uniform rectangular lamina of weight 50 N. It is
suspended in equilibrium in a vertical plane by vertical light chains
attached to the sign at the points A and B, with AB horizontal, as shown
in Figure 8.28.
0.45 m
0.15m
A
B.
Figure 8.28
li) Draw a diagram showing all the forces acting on the sign.
lii) Find the tensions in the chains.
® AB represents a uniform horizontal shelf of weight 30N which is supported
at X and Y. Blocks are placed along the shelf, as shown in Figure 8.29.
30 cm
120 cm
30 cm
60 cm
2 kg
3 kg
5 kg
A
45 cm
135 cm
Figure 8.29
i)
Find the reaction forces of the supports on the shelf at X and Y.
li What is the greatest mass of an object which can be placed at D
without the shelf tipping?

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