1. Radio waves
2. Infrared - x -rays
3. Gamma rays
johnmulu answered the question on February 18, 2017 at 10:18
- 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. Answers (1)
- a)State the condition necessary for a body to float in fluid
b) A ship made of steel is observed to float on water yet the density of steel is approximately eight times that of water(Solved)
a) State the condition necessary for a body to float in fluid
b) A ship made of steel is observed to float on water yet the density of steel is approximately eight times that of water. Explain this observation.
Date posted: February 18, 2017. Answers (1)
- State the law of flotation (Solved)
State the law of flotation
Date posted: February 18, 2017. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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(Solved)
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. Answers (1)
- Ice cubes float on water and solid benzene sinks in liquid benzene, Explain(Solved)
Explain the following observation: Ice cubes float on water and solid benzene sinks in liquid benzene
Date posted: February 18, 2017. Answers (1)
- 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. Answers (1)
- 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. (Solved)
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. Answers (1)
- Explain applications of uniform circular motion in daily life. (Solved)
Explain applications of uniform circular motion in daily life.
Date posted: February 18, 2017. Answers (1)
- State two ways in which the centripetal force on a body can be increased.(Solved)
State two ways in which the centripetal force on a body can be increased.
Date posted: February 18, 2017. Answers (1)
- Define the term angular velocity(Solved)
Define the term angular velocity
Date posted: February 18, 2017. Answers (1)
- 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. (Solved)
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. Answers (1)
- 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(Solved)
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. Answers (1)
- Explain why a pail of water can be swung in vertical circle without the water pouring out.(Solved)
Explain why a pail of water can be swung in vertical circle without the water pouring out.
Date posted: February 18, 2017. Answers (1)
- State the meaning of the term “Principal focus” as applied in lenses(Solved)
The term principal focus is used in lenses. What does it mean?
Date posted: February 18, 2017. Answers (1)
- Define the term accommodation as applied to human eye(Solved)
What is meant by the term accommodation with reference to the eye?
Date posted: February 18, 2017. Answers (1)
- An illuminated vertical object is initially placed on the principle axis of a converging lens and 32 cm from it(Solved)
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. Answers (1)
- 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. (Solved)
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. Answers (1)
- 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.
(Solved)
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. Answers (1)