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Transformation of heat to and from other forms of energy.
sharon kalunda answered the question on September 30, 2019 at 06:27
- 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)
- A steel sphere released in a tall transparent water jar attains a constant velocity after a while. The same sphere released in air falls at...(Solved)
A steel sphere released in a tall transparent water jar attains a constant velocity after a while. The same sphere released in air falls at a constant acceleration. Explain with a reason the difference in its motion in water and in air
Date posted: September 27, 2019. Answers (1)
- A transformer with 6000 turns in the primary circuit and 300 turns in the secondary circuit has its primary circuit connected to a 400V a.c....(Solved)
A transformer with 6000 turns in the primary circuit and 300 turns in the secondary circuit has its primary circuit connected to a 400V a.c. source. A heater connected to the secondary circuit produces heat at the rate of 600W. Assuming that the transformer is 100% efficient determine:-
i). The voltage in the secondary circuit.
ii). The current in the primary circuit.
iii). The current in the secondary circuit.
Date posted: September 27, 2019. Answers (1)
- The figure below shows two adjacent solids of materials Diamond and Ruby.(Solved)
The figure below shows two adjacent solids of materials Diamond and Ruby.
The refractive index of Diamond is 2.4 and that of Ruby is 1.75.
(i) Find the refractive index of Ruby with respect to diamond.
(ii) Draw an accurate ray from diamond such that no light is incident on the screen.
Date posted: September 27, 2019. Answers (1)
- Refraction is the bending of light as it travels from one media to another. State the cause of the bending.(Solved)
Refraction is the bending of light as it travels from one media to another. State the cause of the bending.
Date posted: September 27, 2019. Answers (1)
- The maximum Kinetic energy of the electrons emitted from a metallic surface is 1.6 x 10-19J when the incident radiation is 7.5 x 1014Hz. Calculate...(Solved)
The maximum Kinetic energy of the electrons emitted from a metallic surface is 1.6 x 10-19J when the incident radiation is 7.5 x 1014Hz. Calculate the minimum frequency of radiation for which electrons will be emitted.(A planck’s constant = 6.6 x 10-34Js)
Date posted: September 27, 2019. Answers (1)
- The figure below shows the features of a Geiger-Muller (G.M) Tube used for detecting radiation.(Solved)
The figure below shows the features of a Geiger-Muller (G.M) Tube used for detecting radiation.
(i) State the use of Argon gas and Bromine.
Argon gas
Bromine
(ii) Explain how radiation from the source is detected by the tube.
(iii) State one use of radio activity in medicine.
Date posted: September 27, 2019. Answers (1)