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- sound waves require a material medium to travel while microwaves do not require a material medium to
travel / for transmission.
- sound waves travel with slower speeds while microwaves travel with the speed of light (3.0 x 108m/s).
- sound waves are longitudinal waves while microwaves are transverse in nature.
sharon kalunda answered the question on September 30, 2019 at 07:14
- A current carrying wire is placed above a compass needle as shown in the figure below.If the current flows in the direction A to B,...(Solved)
A current carrying wire is placed above a compass needle as shown in the figure below.If the current flows in the direction A to B, show in the diagram the deflection of the compass needle.
Date posted: September 30, 2019. Answers (1)
- The figure below shows a bulb hydrometer.(Solved)
The figure below shows a bulb hydrometer.
i) State the principle in the hydrometer.
ii) Explain why the hydrometer has a weighted bulb and narrow stem.
Date posted: September 30, 2019. Answers (1)
- Give a reason why when a passenger jumps from a floating boat, the boat moves backwards.(Solved)
Give a reason why when a passenger jumps from a floating boat, the boat moves backwards.
Date posted: September 30, 2019. Answers (1)
- A trailer of mass 30 tonnes travelling at a velocity of 72km/h runs onto a stationary bus of mass 10 tonnes.The impact takes 0.5 seconds...(Solved)
A trailer of mass 30 tonnes travelling at a velocity of 72km/h runs onto a stationary bus of mass 10 tonnes.The impact takes 0.5 seconds before the two vehicles move off together at a constant velocity for 15 seconds. Determine:
i) The common velocity.
ii) The distance moved after the impact.
iii) The impulsive force on the trailer on impact.
Date posted: September 30, 2019. Answers (1)
- The figure below shows a trolley moving on a circular rail with a vertical plane, given that the mass of the trolley is 250g and...(Solved)
The figure below shows a trolley moving on a circular rail with a vertical plane, given that the mass of the trolley is 250g and the radius of the rail is 1.6m.
i) Determine the minimum velocity at which trolley passes point X.
ii) Find the angular velocity at point Z.
iii) The force exerted on the rail at this point.
Date posted: September 30, 2019. Answers (1)
- What does study of thermodynamics entails?(Solved)
What does study of thermodynamics entails?
Date posted: September 30, 2019. Answers (1)
- A tall building has two barometers, one at the ground floor reading 750mmHg and the other at the top reading 748mmHg. Determine the height of...(Solved)
A tall building has two barometers, one at the ground floor reading 750mmHg and the other at the top reading 748mmHg. Determine the height of the building.
Date posted: September 30, 2019. Answers (1)
- The figure below shows a thermometer used by a doctor to determine the temperature of a patient. Why is it difficult to work with this...(Solved)
The figure below shows a thermometer used by a doctor to determine the temperature of a patient. Why is it difficult to work with this thermometer?
Date posted: September 30, 2019. Answers (1)
- A uniform meter rule is balanced as shown in the figure below.By displacement method, the immersed object is found to occupy 13.5cm3. Determine the density...(Solved)
A uniform meter rule is balanced as shown in the figure below.By displacement method, the immersed object is found to occupy 13.5cm3. Determine the density of the liquid in SI units.
Date posted: September 30, 2019. Answers (1)
- The figure below shows a marble placed on an inverted bowl.State and explain the type of equilibrium the marble is.(Solved)
The figure below shows a marble placed on an inverted bowl.State and explain the type of equilibrium the marble is.
Date posted: September 30, 2019. Answers (1)
- Water flows through a narrow pipe of radius 6cm connected to another pipe of radius 9cm. If the speed of water in the narrow pipe...(Solved)
Water flows through a narrow pipe of radius 6cm connected to another pipe of radius 9cm. If the speed of water in the narrow pipe is 3m/s, determine the speed of water in the wider section.
Date posted: September 30, 2019. Answers (1)
- The springs in figure below are identical.The extension produced in A is 4cm. What is the extension in B?(Solved)
The springs in figure below are identical.The extension produced in A is 4cm. What is the extension in B?
Date posted: September 30, 2019. Answers (1)
- The water level in a burette is 20.3cm3. 50 drops of water each of volume 0.1cm3 are added to the water in the burette. What...(Solved)
The water level in a burette is 20.3cm3. 50 drops of water each of volume 0.1cm3 are added to the water in the burette. What is the final reading of the burette?
Date posted: September 30, 2019. Answers (1)
- A 60 litre giant density bottle weighs 100N when empty. What will be its mass when filled with liquid W whose density is 0.72g/cm3? (g=10N/kg)(Solved)
A 60 litre giant density bottle weighs 100N when empty. What will be its mass when filled with liquid W whose density is 0.72g/cm3? (g=10N/kg)
Date posted: September 27, 2019. Answers (1)
- The figure below shows a set used in a physics demonstration.(Solved)
The figure below shows a set used in a physics demonstration.
Briefly suggest two conclusions that may be drawn from the experiment.
Date posted: September 27, 2019. Answers (1)
- On increasing the temperature of a fixed mass of a gas its pressure was noted to increase. Explain(Solved)
On increasing the temperature of a fixed mass of a gas its pressure was noted to increase. Explain
Date posted: September 27, 2019. Answers (1)
- A load was raised using the system shown below. The system was then modified as in (b) and used to raise the same load.(Solved)
A load was raised using the system shown below. The system was then modified as in (b) and used to raise the same load.
State and explain the change in efficiency
Date posted: September 27, 2019. Answers (1)
- A body of mass 25kg moving with uniform accelaration has an initial momentum of 60kgm/s and after 10s the momentum is 90kgm/s. calculate the acceleration...(Solved)
A body of mass 25kg moving with uniform accelaration has an initial momentum of 60kgm/s and after 10s the momentum is 90kgm/s. calculate the acceleration of the body
Date posted: September 27, 2019. Answers (1)
- To what temperature must 2,000cm3 of a gas at 27oC be heated at constant pressure in order for its volume to increase to 25000cm3?(Solved)
To what temperature must 2,000cm3 of a gas at 27oC be heated at constant pressure in order for its volume to increase to 25000cm3?
Date posted: September 27, 2019. Answers (1)
- The stability of a body can be increased by increasing the base area and lowering its centre of gravity. State one way of lowering its...(Solved)
The stability of a body can be increased by increasing the base area and lowering its centre of gravity. State one way of lowering its centre of gravity.
Date posted: September 27, 2019. Answers (1)