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- A metal bench feels colder than a wooden one when one sits on it on a cold morning even though both are at the same...(Solved)
A metal bench feels colder than a wooden one when one sits on it on a cold morning even though both are at the same temperature. Explain this observation.
Date posted: June 3, 2019. Answers (1)
- The diagram below shows an empty wine glass.
(a) State the effect on its stability when wine is put into the glass.
(b) Explain your answer in...(Solved)
The diagram below shows an empty wine glass.
(a) State the effect on its stability when wine is put into the glass.
(b) Explain your answer in (a) above.
Date posted: June 3, 2019. Answers (1)
- Complete figure (a) and (b) below by showing the level of the liquids in the glass tubes.(Solved)
Complete figure (a) and (b) below by showing the level of the liquids in the glass tubes.
Date posted: June 3, 2019. Answers (1)
- The figure below shows a sheet of paper rolled into a tube.
When a stream of air at high speed is blown into the tube,...(Solved)
The figure below shows a sheet of paper rolled into a tube.
When a stream of air at high speed is blown into the tube, the paper tube collapses.
Explain this observation.
Date posted: June 3, 2019. Answers (1)
- The figure below shows a wire A and a spring B made of the same material. The thickens of the wire is the same in...(Solved)
The figure below shows a wire A and a spring B made of the same material. The thickens of the wire is the same in both cases. Masses are added on each at the same interval and the extension noted each time. Sketch the graphs of load against extension for each assuming Hookes law is obeyed.
Date posted: June 3, 2019. Answers (1)
- The graph below shows stopping potential V against frequency for a photocell.
From the graph determine:
(i) Threshold frequency
(ii) Planck’s constant
(iii) Work function of the metal...(Solved)
The graph below shows stopping potential V against frequency for a photocell.
From the graph determine:
(i) Threshold frequency
(ii) Planck’s constant
(iii) Work function of the metal
(Takee = 1.6 x 10-19c)
Date posted: June 3, 2019. Answers (1)
- An object is placed 12cm from a convex lens and it forms a virtual image 36cm from the lens
Calculate the focal length of the lens.(Solved)
An object is placed 12cm from a convex lens and it forms a virtual image 36cm from the lens
Calculate the focal length of the lens.
Date posted: June 3, 2019. Answers (1)
- Complete the diagram below indicating the rays that will lead to the formation of the image I shown below and locate the object position.(Solved)
Complete the diagram below indicating the rays that will lead to the formation of the image I shown below and locate the object position.
Date posted: June 3, 2019. Answers (1)
- A student designed a transformer to provide power to an electric bell marked 24W, 6V from a 240V mains. He wound 50 turns and N...(Solved)
A student designed a transformer to provide power to an electric bell marked 24W, 6V from a 240V mains. He wound 50 turns and N turns on an iron ring. When he a connected the coil of 50 turns to the bell and the N turns coil to an a.c, he found that the transformer was only 60% efficient. Find:
(i) The value of N
(ii) The power in the coil with N turns
Date posted: June 3, 2019. Answers (1)
- Use the law to determine the direction of the induced current in the circuit below(Solved)
Use the law to determine the direction of the induced current in the circuit below
Date posted: June 3, 2019. Answers (1)
- The graph below shows the variation of potential difference V with current, I for a certain cell.
From the graph determine:
(i) Internal reaction of the cell....(Solved)
The graph below shows the variation of potential difference V with current, I for a certain cell.
From the graph determine:
(i) Internal reaction of the cell.
(ii) The e.m.f of the cell
Date posted: June 3, 2019. Answers (1)
- The figure below shows an arrangement of capacitor connected to a 10V DC supply.
Determine
(i) The combined capacitance of the arrangement.
(ii) The total energy stored.(Solved)
The figure below shows an arrangement of capacitor connected to a 10V DC supply.
Determine
(i) The combined capacitance of the arrangement.
(ii) The total energy stored.
Date posted: June 3, 2019. Answers (1)
- In the pipe below complete the diagram to show how air in the open pipe vibrates with a frequency of first overtone.(Solved)
In the pipe below complete the diagram to show how air in the open pipe vibrates with a frequency of first overtone.
Date posted: June 3, 2019. Answers (1)
- The figure below shows a set up by a student.
State and explain what happens to the sound from the buzzer as the bottle and its...(Solved)
The figure below shows a set up by a student.
State and explain what happens to the sound from the buzzer as the bottle and its contents are cooled to 0oC
Date posted: June 3, 2019. Answers (1)
- The figure shows a simple cell.
Use the information on the figure to answer the questions below.
(a) Name the parts labeled A and B
(b) It is...(Solved)
The figure shows a simple cell.
Use the information on the figure to answer the questions below.
(a) Name the parts labeled A and B
(b) It is observed that the bulb goes off after a short time. Explain this observation
Date posted: June 3, 2019. Answers (1)
- A mine worker stands between two vertical cliffs 400m from the nearest cliff. The cliff are x and metres apart. Every time he strike the...(Solved)
A mine worker stands between two vertical cliffs 400m from the nearest cliff. The cliff are x and metres apart. Every time he strike the rock once , he hears two echoes, the first one after 2.5 seconds, while the second follows 2 seconds later.
Calculate
(i) The speed of sound in air.
(ii) The value of x
Date posted: June 3, 2019. Answers (1)
- A bullet of mass 20g moving at 400 m/s strikes a block of wood of mass 3.5kg initially at rest. The bullet sticks into the...(Solved)
A bullet of mass 20g moving at 400 m/s strikes a block of wood of mass 3.5kg initially at rest. The bullet sticks into the block and the two move off together on a horizontal surface, where a frictional retarting force of 4N is acting between the block and surface.
(i) Determine the initial common velocity of bullet and wooden block.
(ii) What distance does the block move before coming to rest?
Date posted: June 3, 2019. Answers (1)
- A striker kicks a ball of mass 250g initially at rest with a force of 75N. if the foot was in contact with the ball...(Solved)
A striker kicks a ball of mass 250g initially at rest with a force of 75N. if the foot was in contact with the ball for 0.10sec. Calculate the take off velocity of the ball.
Date posted: June 3, 2019. Answers (1)
- 1200g of a liquid at 100C is poured into a well-logged calorimeter. An electric heater rated 1KW is used to heat the liquid. The graph...(Solved)
1200g of a liquid at 100C is poured into a well-logged calorimeter. An electric heater rated 1KW is used to heat the liquid. The graph in fig 4 below shows the variation of temperature of the liquid with time.
Use the graph to answer the following questions:
(i) What is the boiling point of the liquid?
(ii) How much heat is given out by the heater to take the liquid to the boiling point?
(iii) Determine the specific heat capacity of the liquid stating any assumptions made.
(iv) If 50g of the liquid vapour was collected by the end of the 8th minute, determine the specific latent heat of vaporization of the liquid.
Date posted: June 3, 2019. Answers (1)
- A test tube of mass 10g and uniform cross-sectional area 4cm2 is partly filled with lead shots and floats vertically in water with 5cm of...(Solved)
A test tube of mass 10g and uniform cross-sectional area 4cm2 is partly filled with lead shots and floats vertically in water with 5cm of its length submerged.
Find the:-
(i) Mass of the lead shots.
(ii) Length of the test tube that would be submerged in a liquid of density 0.75g/cm3.
Date posted: June 3, 2019. Answers (1)