A polar bear appears upside down in the sky due to mirage in very cold climates. When slightly warm air settles over very cold air which is near the ground, the sky reflects images on the ground to produce an upside down image.
QueenR answered the question on April 3, 2018 at 14:12
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A machine has an efficiency of 80%.if the machine is required to overcome a load of 60N with a force of 40N. Calculate the velocity ratio?
(Solved)
A machine has an efficiency of 80%.if the machine is required to overcome a load of 60N with a force of 40N. Calculate the velocity ratio?
Date posted:
March 22, 2018
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Answers (1)
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State TWO reasons why the earth pin in a three pin plug is longer than the others
(Solved)
State TWO reasons why the earth pin in a three pin plug is longer than the others
Date posted:
March 14, 2018
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Answers (1)
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Describe on how to measure the volume of oil drop
(Solved)
Describe on how to measure the volume of oil drop.
Date posted:
March 6, 2018
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Answers (1)
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Describe an experiment on how to measure the thickness of a razor Blade
(Solved)
Describe an experiment on how to measure the thickness of a razor Blade
Date posted:
March 6, 2018
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Answers (1)
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A butcher has a beam balance and masses 0.5kg and 2kg. How would he measure 1.5kg of meat on the balance at once
(Solved)
A butcher has a beam balance and masses 0.5kg and 2kg. How would he measure 1.5kg of meat on the balance at once.
Date posted:
March 5, 2018
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Answers (1)
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State two measurements you would take in an experiment to determine the upthrust of the object
(Solved)
State two measurements you would take in an experiment to determine the upthrust of the object.
Date posted:
March 3, 2018
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Answers (1)
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The density of granite is 2800kg/m3.What is the specific gravity of granite?.
(Solved)
The density of granite is 2800kg/m3.What is the specific gravity of granite?.
Date posted:
February 26, 2018
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Answers (1)
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A butcher has a beam balance and masses 0.5kg and 2.0kg. How would he measure 1.5kg of meat on the balance at once?
(Solved)
A butcher has a beam balance and masses 0.5kg and 2.0kg. How would he measure 1.5kg of meat on the balance at once?
Date posted:
February 26, 2018
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Answers (1)
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Explain how an electric bell works.
(Solved)
Explain how an electric bell works.
Date posted:
February 20, 2018
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Answers (1)
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A screw jack 25% efficient and having a screw pitch of 0.4cm is used to raise a load through a certain height. If the process...
(Solved)
A screw jack 25% efficient and having a screw pitch of 0.4cm is used to raise a load through a certain height. If the process the handle turns through a circle of radius 40cm. Calculate the
1. Velocity ratio of the machine
2. Mechanical advantage of the machine
3. Effort required to raise a load of 1000N with the machine ( take pi =3 1/4)
Date posted:
February 12, 2018
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Answers (1)
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An engineer is contracted to construct a permanent house on a sandy soil. What measure would he take to make sure the house does not...
(Solved)
An engineer is contracted to construct a permanent house on a sandy soil. What measure would he take to make sure the house does not sink?
Date posted:
February 9, 2018
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Answers (1)
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State one reason why racing cars are stable.
(Solved)
State one reason why racing cars are stable.
Date posted:
February 9, 2018
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Answers (1)
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State two factors that determines the efficiency of an inclined plane as a machine
(Solved)
State two factors that determines the efficiency of an inclined plane as a machine
Explain how these factors affect efficiency
Date posted:
February 9, 2018
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Answers (1)
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A crystal of potassium permanganate was carefully introduced at the bottom of water column held in a gas jar. After sometime, the whole volume of...
(Solved)
A crystal of potassium permanganate was carefully introduced at the bottom of water column held in a gas jar. After sometime, the whole volume of water was coloured. Explain this observation
Date posted:
February 9, 2018
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Answers (1)
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State any two maintenance practices for secondary cells
(Solved)
State any two maintenance practices for secondary cells
Date posted:
February 9, 2018
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Answers (1)
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Explain why nylon clothes crackles as you undress.
(Solved)
Explain why nylon clothes crackles as you undress
Date posted:
January 28, 2018
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Answers (1)
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A body weighs 3.6N in air and 2.4N when fully immersed in water.The density of the body in g/cm^3 is?
(Solved)
A body weighs 3.6N in air and 2.4N when fully immersed in water.The density of the body in g/cm^3 is?
Date posted:
January 25, 2018
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Answers (1)
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A bubble of soap blown to the wider end of a funnel,When the top is left open the bubbles flatten to a film which rises...
(Solved)
A bubble of soap blown to the wider end of a funnel,When the top is left open the bubbles flatten to a film which rises up the funnel. Explain observation.
Date posted:
January 23, 2018
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Answers (1)
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Two table tennis balls hang at the same level suspended from a thread a short distance apart. A stream of air is blown between the...
(Solved)
Two table tennis balls hang at the same level suspended from a thread a short distance apart. A stream of air is blown between the balls. Explain what happens to the balls.
Date posted:
January 23, 2018
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Answers (1)
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A beaker containing water was placed on a flat bench.State and explain the changes in stability of the beaker when the water freezes to ice.
(Solved)
A beaker containing water was placed on a flat bench.State and explain the changes in stability of the beaker when the water freezes to ice.
Date posted:
January 23, 2018
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Answers (1)