a. Luminous sources- objects that produces their own light, for example the sun, stars, burning candles,
wood or charcoal fire, electric light bulb, television screens, and glowing worms.
b. Non-luminous –object that do not produce light of their own for example- moon, planets, plants, people,
books, walls, clothes, and wall charts.
joseph rimiru answered the question on October 30, 2017 at 17:40
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Explain the following: (a) Two thin T-shirts are warmer than a single thick one (b) Hot flames go upwards (c) A chimney and a fire help to ventilate a room.
(Solved)
Explain the following:
a. Two thin T-shirts are warmer than a single thick one
b. Hot flames go upwards
c. A chimney and a fire help to ventilate a room.
Date posted:
October 30, 2017
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Answers (1)
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What is thermal equilibrium?
(Solved)
What is thermal equilibrium?
Date posted:
October 30, 2017
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Answers (1)
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(a) Define the terms heat and temperature of stating their SI units (b) How is heat measured?
(Solved)
a. Define the terms heat and temperature of stating their SI units
b. How is heat measured?
Date posted:
October 30, 2017
.
Answers (1)
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In designing a solar heater explain the following: (a) Why the pipe is fixed to a dark coloured collector plate (b) Why the pipe is made of copper
(Solved)
In designing a solar heater explain the following:
a. Why the pipe is fixed to a dark coloured collector plate.
b. Why the pipe is made of copper
c. Why the pipe is coiled several times
d. Why the collector plate is fixed to an insulator
e. Why the panel front is made of glass.
Date posted:
October 30, 2017
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Answers (1)
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A man's feet felt cold while standing on cement compare to a wooden floor. Explain
(Solved)
A man's feet felt cold while standing on cement compare to a wooden floor. Explain.
Date posted:
October 30, 2017
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Answers (1)
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Which features of the clinical thermometer make it special?
(Solved)
Which features of the clinical thermometer make it special?
Date posted:
October 30, 2017
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Answers (1)
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List three main feature of the common liquid-in-glass thermometer.
(Solved)
List three main feature of the common liquid-in-glass thermometer.
Date posted:
October 30, 2017
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Answers (1)
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State four properties of a liquid that is suitable for use in a thermometer.
(Solved)
State four properties of a liquid that is suitable for use in a thermometer.
Date posted:
October 30, 2017
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Answers (1)
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A mechanic wants to fit an iron ring tightly onto a steel rod of equal diameter to the inner diameter of the ring. Explain how...
(Solved)
A mechanic wants to fit an iron ring tightly onto a steel rod of equal diameter to the inner diameter of the ring. Explain how this can be achieved.
Date posted:
October 30, 2017
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Answers (1)
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State and explain two disadvantages of anomalous expansion of water.
(Solved)
State and explain two disadvantages of anomalous expansion of water.
Date posted:
October 27, 2017
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Answers (1)
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Explain briefly a mechanism by which heat is conducted through a metal.
(Solved)
Explain briefly a mechanism by which heat is conducted through a metal.
Date posted:
October 27, 2017
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Answers (1)
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Force F acts on a body of mass M such that its velocity changes from u to v in time t. Derive from first principles...
(Solved)
Force F acts on a body of mass M such that its velocity changes from u to v in time t. Derive from first principles the equation: F=ma.
Date posted:
October 27, 2017
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Answers (1)
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Explain why water stored in an earthen jar becomes cooler than the one which is stored in a metallic jar.
(Solved)
Explain why water stored in an earthen jar becomes cooler than the one which is stored in a metallic jar.
Date posted:
October 27, 2017
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Answers (1)
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State and explain the effect of decrease in temperature on the surface tension.
(Solved)
State and explain the effect of decrease in temperature on the surface tension.
Date posted:
October 27, 2017
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Answers (1)
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A spring extends by 2cm when a mass of 50g is hanged on it. What force is required to extend it by 2.5cm?
(Solved)
A spring extends by 2cm when a mass of 50g is hanged on it. What force is required to extend it by 2.5cm?
Date posted:
October 27, 2017
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Answers (1)
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Why is the scald from steam more hurting than that of boiling water?
(Solved)
Why is the scald from steam more hurting than that of boiling water?
Date posted:
October 27, 2017
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Answers (1)
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A driving gear wheel having 25 teeth engages with a second wheel with 100 teeth. If the gear system is 85% efficient, find the mechanical...
(Solved)
A driving gear wheel having 25 teeth engages with a second wheel with 100 teeth. If the gear system is 85% efficient, find the mechanical advantage.
Date posted:
October 27, 2017
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Answers (2)
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What is the purpose of the pear- shaped cross section of a clinical thermometer.
(Solved)
What is the purpose of the pear- shaped cross section of a clinical thermometer.
Date posted:
October 27, 2017
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Answers (1)
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Describe how microwaves are used in determining distances of objects as in the radar
(Solved)
Describe how microwaves are used in determining distances of objects as in the radar
Date posted:
October 27, 2017
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Answers (1)
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The element of an electric hot plate has a resistance of 80Ohms. What is the energy dissipated when the element is kept on for 20...
(Solved)
The element of an electric hot plate has a resistance of 80Ohms. What is the energy dissipated when the element is kept on for 20 minutes on a 240V supply
Date posted:
October 27, 2017
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Answers (1)