Our ancestors found that by tying two or more circular logs together to form a raft instead of digging a hollow in each log, it would have a more stable platform to carry more weight and enabled them to migrate further across the oceans. The reasons for this added stability are: (i) It increases the metacentric height GM by increasing the height of metacenter M. It increases the metacentric radius BM. It enables a large shift of the centre of buoyancy B laterally to produce a strong restoring moment when it is tilted. (ii) (iii) (A) (B) (C) (D) (i) (ii) (iii) (iv) (i) and (ii) (ii) and (iii) (i) and (iii) All of the above In flow of air past an aerofoil with velocity U, a viscous boundary layer is formed arising from the viscous effect on the surface of the aerofoil. Due to no-slip condition at the wall, the velocity at the wall is zero. Across the boundary layer, the relationship between the static pressure at the wall P, and that at the edge of boundary layer P, is given by: P> P Pw = P₂ PP₂ Rw = P₂ + p U²

Our ancestors found that by tying two or more circular logs together to form a raft instead of digging a hollow in each log, it would have a more stable platform to carry more weight and enabled them to migrate further across the oceans. The reasons for this added stability are: (i) It increases the metacentric height GM by increasing the height of metacenter M. It increases the metacentric radius BM. It enables a large shift of the centre of buoyancy B laterally to produce a strong restoring moment when it is tilted. (ii) (iii) (A) (B) (C) (D) (i) (ii) (iii) (iv) (i) and (ii) (ii) and (iii) (i) and (iii) All of the above In flow of air past an aerofoil with velocity U, a viscous boundary layer is formed arising from the viscous effect on the surface of the aerofoil. Due to no-slip condition at the wall, the velocity at the wall is zero. Across the boundary layer, the relationship between the static pressure at the wall P, and that at the edge of boundary layer P, is given by: P> P Pw = P₂ PP₂ Rw = P₂ + p U²

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Description: Our ancestors found that by tying two or more circular logs together to form araft instead of digging a hollow in each log, it would have a more stable platformto carry more weight and enabled them to migrate further across the oceans. Thereasons fo

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Section: Chapter Questions

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Question

Our ancestors found that by tying two or more circular logs together to form a
raft instead of digging a hollow in each log, it would have a more stable platform
to carry more weight and enabled them to migrate further across the oceans. The
reasons for this added stability are:
(i) It increases the metacentric height GM by increasing the height of
metacenter M.
(ii)
It increases the metacentric radius BM.
It enables a large shift of the centre of buoyancy B laterally to produce a
strong restoring moment when it is tilted.
(A) (i) and (ii)
(B)
(ii) and (iii)
(C)
(i) and (iii)
(D)
All of the above
In flow of air past an aerofoil with velocity U, a viscous boundary layer is formed
arising from the viscous effect on the surface of the aerofoil. Due to no-slip
condition at the wall, the velocity at the wall is zero. Across the boundary layer,
the relationship between the static pressure at the wall and that at the edge of
boundary layer is given by:
P> P
P₁ = Pe
P₂
P<P
P₁ = P₁+ ²p U²
(i)
(ii)
(iii)
(iv)
(A)
(B)
(C)
(D)

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