1. Radio waves
2. Infrared - x -rays
3. Gamma rays
johnmulu answered the question on February 18, 2017 at 10:18
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A balloon is filled with a gas which is lighter than air. It is observed to rise in air up to a certain height.
(Solved)
A balloon is filled with a gas which is lighter than air. It is observed to rise in air up to a certain height. State a reason why the balloon stops rising.
Date posted:
February 18, 2017
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Answers (1)
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State the law of flotation
(Solved)
State the law of flotation
Date posted:
February 18, 2017
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Answers (1)
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When a piece of metal is placed on water, it sinks. But when the same piece of metal is placed on a block of wood, both are found to float.
(Solved)
When a piece of metal is placed on water, it sinks. But when the same piece of metal is placed on a block of wood, both are found to float. Explain this observation.
Date posted:
February 18, 2017
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Answers (1)
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A block of glass of mass 250 g floats in mercury. What volume of glass lies under the surface of the mercury? (Density of mercury is 13.6 x 103Kgm-3)
(Solved)
A block of glass of mass 250 g floats in mercury. What volume of glass lies under the surface of the mercury? (Density of mercury is 13.6 x 103Kgm-3)
Date posted:
February 18, 2017
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Answers (1)
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A block of wood weighing 2.0 N is held under water by a string attached to the bottom of a container. The tension in the string is 0.5 N
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A block of wood weighing 2.0 N is held under water by a string attached to the bottom of a container. The tension in the string is 0.5 N. Determine the density of the wood.
Date posted:
February 18, 2017
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Answers (1)
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Ice cubes float on water and solid benzene sinks in liquid benzene, Explain
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Explain the following observation: Ice cubes float on water and solid benzene sinks in liquid benzene
Date posted:
February 18, 2017
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Answers (1)
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A solid copper sphere will sink in water while a hollow copper sphere of the same mass may float.
(Solved)
A solid copper sphere will sink in water while a hollow copper sphere of the same mass may float. Explain this observation.
Date posted:
February 18, 2017
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Answers (1)
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When a bus goes a round bend on a flat road, it experiences a centripetal force, State what provides the centripetal force and the purpose of banking roads at bends.
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a) When a bus goes a round bend on a flat road, it experiences a centripetal force. State what provides the centripetal force
b) State the purpose of banking roads at bends.
Date posted:
February 18, 2017
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Answers (1)
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Explain applications of uniform circular motion in daily life.
(Solved)
Explain applications of uniform circular motion in daily life.
Date posted:
February 18, 2017
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Answers (1)
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State two ways in which the centripetal force on a body can be increased.
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State two ways in which the centripetal force on a body can be increased.
Date posted:
February 18, 2017
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Answers (1)
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Define the term angular velocity
(Solved)
Define the term angular velocity
Date posted:
February 18, 2017
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Answers (1)
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A body mass 0.50 kg is attached to the end of a string of length 50 cm and Whirled in a horizontal circle. If the tension in the string is 81N, Determine the velocity of the body.
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A body mass 0.50 kg is attached to the end of a string of length 50 cm and Whirled in a horizontal circle. If the tension in the string is 81N, Determine the velocity of the body.
Date posted:
February 18, 2017
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Answers (1)
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A car of mass 1200 kg is moving with a velocity of 25ms-1 around a flat bend of radius 150m. Determine the minimum frictional force between the tyres and the road that will prevent the car from sliding off
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A car of mass 1200 kg is moving with a velocity of 25ms-1 around a flat bend of radius 150m. Determine the minimum frictional force between...
Date posted:
February 18, 2017
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Answers (1)
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Explain why a pail of water can be swung in vertical circle without the water pouring out.
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Explain why a pail of water can be swung in vertical circle without the water pouring out.
Date posted:
February 18, 2017
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Answers (1)
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State the meaning of the term “Principal focus” as applied in lenses
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The term principal focus is used in lenses. What does it mean?
Date posted:
February 18, 2017
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Answers (1)
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Define the term accommodation as applied to human eye
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What is meant by the term accommodation with reference to the eye?
Date posted:
February 18, 2017
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Answers (1)
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An illuminated vertical object is initially placed on the principle axis of a converging lens and 32 cm from it
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An illuminated vertical object is initially placed on the principle axis of a converging lens and 32 cm from it. The focal length of the lens is 15 cm. The object is now placed at a point 12 cm from the lens and on the same side. State two changes other than magnification that are observed on the image formed due to this change.
Date posted:
February 18, 2017
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Answers (1)
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An object placed in front of a convex lens of focal length 10 cm produces an image at a distance of 15 cm from the lens and on the same side as the object.
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An object placed in front of a convex lens of focal length 10 cm produces an image at a distance of 15 cm from the lens and on the same side as the object. Determine the position of the object.
Date posted:
February 18, 2017
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Answers (1)
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The pressure of the air inside a car tyre increases if the car stands out in the sun for some time on a hot day. Explain the pressure increase in terms of the kinetic theory of gases.
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The pressure of the air inside a car tyre increases if the car stands out in the sun for some time on a hot day. Explain the pressure increase in terms of the kinetic theory of gases.
Date posted:
February 18, 2017
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Answers (1)
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A long horizontal capillary tube of uniform bore sealed at one end contains dry air trapped by a drop of mercury. The length of the air column is 142 mm at 17oC.
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A long horizontal capillary tube of uniform bore sealed at one end contains dry air trapped by a drop of mercury. The length of the air column is 142 mm at 17oC. Determine the length of the air column at 25oC.
Date posted:
February 18, 2017
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Answers (1)