Ice is a poor conductor of heat and less dense than water. During winter, ice floats and insulates the water under it. Below the frozen layer, the water remains in its liquid state and does not freeze. Also, oxygen is trapped beneath the layer of ice. This makes it possible for aquatic animals to survive during winter.
chrispohmomanyi answered the question on September 16, 2017 at 18:39
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Define the following terms as applied to curved mirrors. (a) Principal axis. (b) Centre of curvature(c) Principal focus
(Solved)
Define the following terms as applied to curved mirrors.
a) Principal axis.
b) Centre of curvature.
c) Principal focus.
Date posted:
September 16, 2017
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Answers (1)
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Differentiate between the images formed by a convex mirror and a pinhole camera
(Solved)
Differentiate between the images formed by a convex mirror and a pinhole camera
Date posted:
September 16, 2017
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Answers (1)
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State three properties of a liquid used in the thermometer
(Solved)
State three properties of a liquid used in the thermometer
Date posted:
September 16, 2017
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Answers (1)
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Distinguish between cohesive and adhesive forces.
(Solved)
Distinguish between cohesive and adhesive forces.
Date posted:
September 16, 2017
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Answers (1)
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When mercury in a glass thermometer is used to measure the temperature of hot water, it is observed
that the mercury level first drops before beginning...
(Solved)
When mercury in a glass thermometer is used to measure the temperature of hot water, it is observed
that the mercury level first drops before beginning to rise. Explain.
Date posted:
September 16, 2017
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Answers (1)
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A metal ball is cooled.State how the density of the ball will be affected
(Solved)
A metal ball is cooled, state how the density of the ball will be affected
Date posted:
September 16, 2017
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Answers (1)
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Explain how air enters the barrel of a Bunsen burner when the gas supply is opened.
(Solved)
Explain how air enters the barrel of a Bunsen burner when the gas supply is opened.
Date posted:
September 16, 2017
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Answers (1)
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Explain how dynamic lift of the aeroplane is caused by the wings
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Explain how dynamic lift of the aeroplane is caused by the wings
Date posted:
September 16, 2017
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Answers (1)
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Define the term streamline flow.
(Solved)
Define the term streamline flow.
Date posted:
September 16, 2017
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Answers (1)
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Explain how heat loss by radiation is minimized in a vacuum flask.
(Solved)
Explain how heat loss by radiation is minimized in a vacuum flask.
Date posted:
September 16, 2017
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Answers (1)
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State one factor which affects stability of objects.
(Solved)
State one factor which affects stability of objects.
Date posted:
September 16, 2017
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Answers (1)
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A meter rule is balanced by masses of 18g and 12g suspended from its ends. Find the position of its pivot point.
(Solved)
A meter rule is balanced by masses of 18g and 12g suspended from its ends. Find the position of its pivot point.
Date posted:
September 16, 2017
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Answers (1)
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The volume of a fixed mass of gas collected at 73°C is 0.04m³ at normal atmospheric pressure. Determine the volume when the temperature drops to...
(Solved)
The volume of a fixed mass of gas collected at 73⁰C is 0.04m³ at normal atmospheric pressure. Determine the volume when the temperature drops to 10⁰C at the same pressure.
Date posted:
September 16, 2017
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Answers (1)
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Explain why convection currents in gases are set up much faster than convection currents in liquids.
(Solved)
Explain why convection currents in gases are set up much faster than convection currents in liquids.
Date posted:
September 16, 2017
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Answers (1)
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In an experiment to estimate the size of a molecule of olive oil, a drop of oil of volume 0.24mm³ was placed on a clean...
(Solved)
In an experiment to estimate the size of a molecule of olive oil, a drop of oil of volume 0.24mm³ was placed on a clean water surface. The oil spread into a patch of area 4.2 x 10⁴mm². Estimate the size of a molecule of olive oil and express your answer in meters.
Date posted:
September 16, 2017
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Answers (1)
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Explain how aquatic animals and plants survive in a lake whose top layer is ice at 0oC.
(Solved)
Explain how aquatic animals and plants survive in a lake whose top layer is ice at 0oC.
Date posted:
September 16, 2017
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Answers (1)
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Explain why the smell of a rotting body is very strong when the sun is hot as compared to early in the morning.
(Solved)
Explain why the smell of a rotting body is very strong when the sun is hot as compared to early in the morning.
Date posted:
September 16, 2017
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Answers (1)
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Explain how oiling still water controls the breeding of mosquitoes
(Solved)
Explain how oiling still water controls the breeding of mosquitoes
Date posted:
September 16, 2017
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Answers (1)
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If the ball is spinning in the anticlockwise direction, the ball is seen to move upwards from its initial path. Explain
(Solved)
If the ball is spinning in the anticlockwise direction, the ball is seen to move upwards from its initial path. Explain
Date posted:
September 16, 2017
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Answers (1)
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Explain how the braking system of a car works.
(Solved)
Explain how the braking system of a car works.
Date posted:
September 15, 2017
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Answers (1)