Air flows over the top faster than air flow underneath; so air pressure on the top is less than air
pressure underneath.The difference in pressure causes the lift effect.
sharon kalunda answered the question on April 4, 2019 at 05:35
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In the diagram in figure, water flows through a section of a pipe whose diameter changes as shown
(Solved)
In the diagram in figure, water flows through a section of a pipe whose diameter changes as shown
Sketch a graph of the variation of pressure along the line ABCD.
Date posted:
April 4, 2019
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Answers (1)
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The diagram below shows a section of a pipe with different cross – sectional area.
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The diagram below shows a section of a pipe with different cross – sectional area.
If water flows with a velocity of 5m/s in section P, what would be the velocity of water in section Q if the cross sectional areas are as shown?
Date posted:
April 4, 2019
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Answers (1)
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Figure below shows the cross-section of an aerofoil, with the aeroplane moving in the direction shown by the arrow.
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Figure below shows the cross-section of an aerofoil, with the aeroplane moving in the direction shown by the arrow.
Sketch the streamlines to show how air flows past the wing as the aeroplane moves
Date posted:
April 4, 2019
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Answers (1)
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A uniform metre rule is balanced at its centre. It is balanced by the 30N, 5N and the magnetic
force between P and Q. P is...
(Solved)
A uniform metre rule is balanced at its centre. It is balanced by the 30N, 5N and the magnetic
force between P and Q. P is fixed and Q has a weight of 5N
Ignoring the weight of the metre rule, calculate the value of the magnetic force between Q and P
Date posted:
April 3, 2019
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Answers (1)
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Figure shows a spring coin which tends to remain vertical but topples immediately it stops spinning.
(Solved)
Figure shows a spring coin which tends to remain vertical but topples immediately it stops spinning.
Explain this observation
Date posted:
April 3, 2019
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Answers (1)
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In the set up in figure, the metre rule is in equilibrium
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In the set up in figure, the metre rule is in equilibrium.
Given that the metre rule is uniform, determine its weight
Date posted:
April 3, 2019
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Answers (1)
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The figure below shows a wine glass
(Solved)
The figure below shows a wine glass
State and explain the effect on its stability when wine is put into the glass.
Date posted:
April 3, 2019
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Answers (1)
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A uniform half metre long beam, pivoted at the 10cm mark, balances when a mass of 150g is suspended at the 0cm mark as shown...
(Solved)
A uniform half metre long beam, pivoted at the 10cm mark, balances when a mass of 150g is suspended at the 0cm mark as shown below:
Calculate the weight of the beam
Date posted:
April 3, 2019
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Answers (1)
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Figure below shows a uniform rod AE which is 40cm long. It has a mass of 2kg and pivoted at D. If 2N is acting...
(Solved)
Figure below shows a uniform rod AE which is 40cm long. It has a mass of 2kg and pivoted at D. If 2N is acting at point E, and 30N force is passed through a frictionless pulley.
Find the force (x) acting at end A.
Date posted:
April 3, 2019
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Answers (1)
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Figure shows a uniform wooden plank which weighs 10N. The plank is balanced at 0.8m from one end by a mass of 2.5kg.
(Solved)
Figure shows a uniform wooden plank which weighs 10N. The plank is balanced at 0.8m from one end by a mass of 2.5kg.
What is the length of the wooden plank in metres?
Date posted:
April 3, 2019
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Answers (1)
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The fig. below shows a floating object of volume 40,000 cm3 and mass 10g. It is held as shown in water of density 1.25g/cm3 by...
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The fig. below shows a floating object of volume 40,000 cm3 and mass 10g. It is held as shown in water of density 1.25g/cm3 by a light cable at the bottom so that ¾ of the volume of the object is below the water surface. (Assume that up thrust due to air is negligible)
Calculate the volume of the object under water. *
Date posted:
April 3, 2019
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Answers (1)
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The figure below shows a system in equilibrium at room temperature. The system is taken outside where the temperature is 20oC higher for sometime.
(Solved)
The figure below shows a system in equilibrium at room temperature. The system is taken outside where the temperature is 20oC higher for sometime.
Explain why it tips to the right when it is taken outside the room.
Date posted:
April 3, 2019
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Answers (1)
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The diagram below shows a uniform meter rule of mass 300g balanced by two forces F1 and F2.Force F2 is 5N. Assuming there is no...
(Solved)
The diagram below shows a uniform meter rule of mass 300g balanced by two forces F1 and F2.Force F2 is 5N. Assuming there is no frictional force on the pulleys,
Calculate the force F1
Date posted:
April 3, 2019
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Answers (1)
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Figure below shows a uniform metre rule in equilibrium under the forces shown
(Solved)
Figure below shows a uniform metre rule in equilibrium under the forces shown.
Determine the weight of the metre rule
Date posted:
April 3, 2019
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Answers (1)
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Draw a sketch of a micrometer screw gauge showing a reading of 8.53mm.
(Solved)
Draw a sketch of a micrometer screw gauge showing a reading of 8.53mm.
Date posted:
April 3, 2019
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Answers (1)
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Give the reading on the micrometer screw gauge if it has a positive zero error of 0.01mm
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Give the reading on the micrometer screw gauge if it has a positive zero error of 0.01mm.
Date posted:
April 3, 2019
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Answers (1)
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Figure (a) Shows vernier calipers with the jaws completely closed while (b) shows the same vernier calipers in use to measure the diameter of a...
(Solved)
Figure (a) Shows vernier calipers with the jaws completely closed while (b) shows the same vernier calipers in use to measure the diameter of a coin.
Determine the actual diameter of the coin
Date posted:
April 3, 2019
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Answers (1)
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When a drop of olive oil of radius 1.36mm is placed on the surface of water, it spreads out
to form a circular film of diameter...
(Solved)
When a drop of olive oil of radius 1.36mm is placed on the surface of water, it spreads out
to form a circular film of diameter 40cm. Calculate;
(a) The volume of the olive oil drop in m3 (Take pi = 22/7)
(b) Using the value of (a) above, estimate the thickness of the film.
Date posted:
April 3, 2019
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Answers (1)
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Three identical springs A, B and C of negligible weight are arranged as shown below;
(Solved)
Three identical springs A, B and C of negligible weight are arranged as shown below;
If C stretches by 3cm, and bar XY is assumed to be weightless, determine the extension in A
Date posted:
April 3, 2019
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Answers (1)
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Figure shows marble of mass 2.0g placed between the jaws of Vernier calipers. The magnified section is also shown. The reading of the gauge when...
(Solved)
Figure shows marble of mass 2.0g placed between the jaws of Vernier calipers. The magnified section is also shown. The reading of the gauge when the jaws were fully closed without the marble was 0.01cm. Use this information and the figure to answer questions a and b.
a)What is the diameter of the marble?
b)Determine the density of the marble give your answer to three significant figure (assume that the
marble is spherical)
Date posted:
April 3, 2019
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Answers (1)