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Becomes less stable. When the water freezes it expands raising the position of centre of gravity.
Githiari answered the question on January 23, 2018 at 14:12
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Why is a metal cap of a leaf electroscope circular?
Date posted: January 21, 2018. Answers (1)
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State what happens to the molecules of a gas in a sealed container when temperature of the gas is increased.
Date posted: January 20, 2018. Answers (1)
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Give five examples of suspended particulate matter.
Date posted: January 20, 2018. Answers (1)
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List the two categories of suspended particulate matter that causes pollution.
Date posted: January 20, 2018. Answers (1)
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Describe ozone depletion and its effects.
Date posted: January 20, 2018. Answers (1)
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Describe global warming and greenhouse effect in details and state their effects to environment.
Date posted: January 20, 2018. Answers (1)
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While heating water in a beaker, a wire gauze is placed below the beaker. Explain.
Date posted: January 16, 2018. Answers (1)
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Define principal focus of a concave mirror(Solved)
Define principal focus of a concave mirror
Date posted: January 10, 2018. Answers (1)
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How does the distance between the interference fringes and the separation distance of the slits relate?
Date posted: January 8, 2018. Answers (1)
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Can visible light produce interference fringes? Explain
Date posted: January 8, 2018. Answers (1)
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Briefly explain how unpolarized light and plane polarized lights can be distinguished.
Date posted: January 8, 2018. Answers (1)
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A student makes a loud sound and hears the echo of the sound after 2.0s. If the speed of sound in air is 330.5m/s, calculate the distance between the student and the object causing the echo.
Date posted: January 7, 2018. Answers (1)
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What do you understand by the term e.m.f of a cell?
Date posted: January 7, 2018. Answers (1)
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Is it safe to stay in a car during a lightning storm? Explain.
Date posted: January 7, 2018. Answers (1)
- (i) State Snell’s law of refraction of light (ii) Give two advantages of totally internally reflecting prisms over plane...(Solved)
(i) State Snell’s law of refraction of light
(ii) Give two advantages of totally internally reflecting prisms over plane mirrors.
Date posted: January 7, 2018. Answers (1)
- A form 4 student observed that his grandfather positions a book far from his eyes when reading it. Explain the type of lenses that the...(Solved)
A form 4 student observed that his grandfather positions a book far from his eyes when reading it. Explain the type of lenses that the student should advice his grandfather to wear.
Date posted: January 7, 2018. Answers (1)
- When a new dry cell is connected in series with a 2.7 ohms resistor, a current of 0.5A flows in the circuit. Determine the internal resistance...(Solved)
When a new dry cell is connected in series with a 2.7 ohms resistor, a current of 0.5A flows in the circuit. Determine the internal resistance of the cell.
Date posted: January 7, 2018. Answers (1)
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Why does a gun recoil when it is fired ?
Date posted: January 7, 2018. Answers (1)
- Water flows along a horizontal pipe of cross-section area 35^2 cm and constriction of cross section 5^2 cm . if the speed of water...(Solved)
Water flows along a horizontal pipe of cross-section area 35^2 cm and constriction of cross section 5^2 cm . if the speed of water at the construction is 2 m/s
Calculate:
i)Continuity constant in SI unit
ii) the speed in the wide section
Date posted: January 7, 2018. Answers (1)
- A boy heats 5kg of water to a temperature of 80oC. When she adds m kg of water at 15oC the mixture attains a...(Solved)
A boy heats 5kg of water to a temperature of 80oC. When she adds m kg of water at 15oC the mixture attains a temperature of 40oC. Determine the value of m
Date posted: January 7, 2018. Answers (1)