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Air is warmer at upper layers.
Velocity of sound waves will be higher in the upper layers than lower layers hence they will be refracted downwards.
Kavungya answered the question on June 3, 2019 at 09:04
- A student set up a mass attached to a spring such that when it oscillates, it taps on water surface in a wide shallow tank.
The...(Solved)
A student set up a mass attached to a spring such that when it oscillates, it taps on water surface in a wide shallow tank.
The student measured time for 20 oscillations and found that the mass takes 36 seconds. Given that the student counted four rippies between the mass and end B of the tank. Determine the speed of the waves.
Date posted: June 3, 2019. Answers (1)
- State two properties of an image formed by a concave mirror that makes it suitable for use by barbers.(Solved)
State two properties of an image formed by a concave mirror that makes it suitable for use by barbers.
Date posted: June 3, 2019. Answers (1)
- Define focal plane.(Solved)
Define focal plane.
Date posted: June 3, 2019. Answers (1)
- Figure below shows a current carrying conductor placed perpendicularly between the poles of a magnet.
(i) Show on the diagram the magnetic field pattern.
(ii) The...(Solved)
Figure below shows a current carrying conductor placed perpendicularly between the poles of a magnet.
(i) Show on the diagram the magnetic field pattern.
(ii) The direction of net force on the conductor.
Date posted: June 3, 2019. Answers (1)
- The table below shows the type of radiation detection method and uses of electro-magnetic radiations. Complete the table.(Solved)
The table below shows the type of radiation detection method and uses of electro-magnetic radiations. Complete the table.
Date posted: June 3, 2019. Answers (1)
- The figure below shows an electroscope being charged by induction.
(i) State the reason why the cap of the electroscope is made circular.
(ii) On the...(Solved)
The figure below shows an electroscope being charged by induction.
(i) State the reason why the cap of the electroscope is made circular.
(ii) On the same diagram, show the direction of the flow of electrons on the earth wire.
Date posted: June 3, 2019. Answers (1)
- Figure below shows an image formed in a plane mirror.
By drawing incident rays for the rays shown, locate the position of the object.(Solved)
Figure below shows an image formed in a plane mirror.
By drawing incident rays for the rays shown, locate the position of the object.
Date posted: June 3, 2019. Answers (1)
- The figure below shows rectangular block of height 4cm floating vertically in a beaker containing two
immiscible liquid A and B. The densities of the liquid...(Solved)
The figure below shows rectangular block of height 4cm floating vertically in a beaker containing two
immiscible liquid A and B. The densities of the liquid are 8000 kg/m³ and 12,000kg/m³ respectively.
The cross sectional area is 2cm².
Determine.
(i) the weight of the liquid A displaced by the black.
(ii) the weight of the liquid B displaced by the block.
(iii) the mass of the block.
(iv) the density of the block.
Date posted: June 3, 2019. Answers (1)
- A man uses the inclined plane to lift a 50kg load through a vertical line height of 4.0m. The inclined plane makes an angle of...(Solved)
A man uses the inclined plane to lift a 50kg load through a vertical line height of 4.0m. The inclined plane makes an angle of 300 with the horizontal. If the efficiency of the inclined plane is 80%, determine.
(a) The effort needed to move the load up the inclined plane at a constant velocity.
(b) The work done against friction in raising the load through the height of 4.0m. (Take g = 10N/kg).
Date posted: June 3, 2019. Answers (1)
- A minibus of mass 1600kg travelling at a constant velocity of 20mls collides with a stationary car of mass 800kg. The impact takes 2 seconds...(Solved)
A minibus of mass 1600kg travelling at a constant velocity of 20mls collides with a stationary car of mass 800kg. The impact takes 2 seconds before the two moves together and come to rest after 15 seconds. Determine.
(a) The common velocity.
(b) The distance moved after the impact.
(c) The impulse force.
Date posted: June 3, 2019. Answers (1)
- What is meant by perfectly inelastic collision.(Solved)
What is meant by perfectly inelastic collision.
Date posted: June 3, 2019. Answers (1)
- The moon goes round the earth at a constant speed. Explain why it is true to say the moon is accelerating.(Solved)
The moon goes round the earth at a constant speed. Explain why it is true to say the moon is accelerating.
Date posted: June 3, 2019. Answers (1)
- A block of metal of mass 150g at 1000C is dropped into a lagged calorimeter of heat capacity 40Jk-1 containing 100g of water at 250C....(Solved)
A block of metal of mass 150g at 1000C is dropped into a lagged calorimeter of heat capacity 40Jk-1 containing 100g of water at 250C. The temperature of the resulting mixture is 340C. (Specific heat capacity of water = 4200Jkgˉ¹).
Determine;
(i) Heat gained by calorimeter.
(ii) Heat gained by water.
(iii) Heat lost by the metal block.
(iv) Specific heat capacity of the metal block.
Date posted: June 3, 2019. Answers (1)
- State the difference between the temperature measured in Kelvin scale and Celsius scale.(Solved)
State the difference between the temperature measured in Kelvin scale and Celsius scale.
Date posted: June 3, 2019. Answers (1)
- A steel cylinder of capacity 0.5m³ contains nitrogen at a pressure of 30,000Pa when the temperature is 270C. What will be the pressure of nitrogen...(Solved)
A steel cylinder of capacity 0.5m³ contains nitrogen at a pressure of 30,000Pa when the temperature is 270C. What will be the pressure of nitrogen if it is allowed to flow into another cylinder of capacity 9.5m³ with the temperature reduced to -230C?
Date posted: June 3, 2019. Answers (1)
- The figure below shows a set-up that may be used to verify pressure law.
(i) State the measurements that should be taken in the experiment.
(ii) Explain...(Solved)
The figure below shows a set-up that may be used to verify pressure law.
(i) State the measurements that should be taken in the experiment.
(ii) Explain how the measurements in (i) above may be used to verify pressure law.
Date posted: June 3, 2019. Answers (1)
- What is meant by the term “banking” of the road?(Solved)
What is meant by the term “banking” of the road?
Date posted: June 3, 2019. Answers (1)
- When the temperature of a gas in a closed container is raised, the pressure of the gas increases. Explain in terms of kinetic energy how...(Solved)
When the temperature of a gas in a closed container is raised, the pressure of the gas increases. Explain in terms of kinetic energy how the molecules of the gas cause an increase in pressure.
Date posted: June 3, 2019. Answers (1)
- A uniform metre rule pivoted at it’s 15.0cm mark is balanced by a 2N weight suspended at the 5.0cm mark. Determine the mass of the...(Solved)
A uniform metre rule pivoted at it’s 15.0cm mark is balanced by a 2N weight suspended at the 5.0cm mark. Determine the mass of the metre rule.
Date posted: June 3, 2019. Answers (1)
- On the Cartesian plan below sketch a graph to show how the density of water varies from O0C to 100C.(Solved)
On the Cartesian plan below sketch a graph to show how the density of water varies from O0C to 100C.
Date posted: June 3, 2019. Answers (1)