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- The figure below shows a drop of fatty acid on a wire of diameter 1.4mm(Solved)
The figure below shows a drop of fatty acid on a wire of diameter 1.4mm
When the drop of the fatty acid was placed on clean water surface it formed a circular patch of diameter 91cm.
i) Estimate the length of the molecule of the fatty acid.
ii) State the assumption made in part (i) above.
Date posted: September 30, 2019. Answers (1)
- The arrangement in the figure below was used to determine the specific heat capacity of the metal.(Solved)
The arrangement in the figure below was used to determine the specific heat capacity of the metal.
State the precautions that need to be taken.
Date posted: September 30, 2019. Answers (1)
- A boy poured some boiling water into a plastic can and placed an air-tight cork on its open end. He then ran some cold water...(Solved)
A boy poured some boiling water into a plastic can and placed an air-tight cork on its open end. He then ran some cold water on it for about 20 seconds after which he shook the can vigorously. State and explain what he observed.
Date posted: September 30, 2019. Answers (1)
- State the law represented in figure below.(Solved)
State the law represented in figure below.
Date posted: September 30, 2019. Answers (1)
- State the contribution physics has made to the entertainment industry.(Solved)
State the contribution physics has made to the entertainment industry.
Date posted: September 30, 2019. Answers (1)
- The figure below shows a uniform bar of weight 5N and length 1.1m pivoted at a point and in equilibrium under the action of the...(Solved)
The figure below shows a uniform bar of weight 5N and length 1.1m pivoted at a point and in equilibrium under the action of the forces shown.
Determine the value of weight W.
Date posted: September 30, 2019. Answers (1)
- Two forces are acting on a body as shown in the figure below. By use of a vector, draw the body and show the resultant...(Solved)
Two forces are acting on a body as shown in the figure below. By use of a vector, draw the body and show the resultant force.
Date posted: September 30, 2019. Answers (1)
- The figure below shows a graph showing the behaviour of a helical spring.(Solved)
The figure below shows a graph showing the behaviour of a helical spring.
Determine the spring constant in SI units.
Date posted: September 30, 2019. Answers (1)
- The water level in a burette is 30.6cm³, 50 drops of water each of volume 0.2cm³ are added to the water in the burette. What...(Solved)
The water level in a burette is 30.6cm³, 50 drops of water each of volume 0.2cm³ are added to the water in the burette. What is the final reading of the burette.
Date posted: September 30, 2019. Answers (1)
- A transformer with 1200 turns in the primary circuit and 120 turns in the secondary circuit has its primary circuit connected to a 400V a.c....(Solved)
A transformer with 1200 turns in the primary circuit and 120 turns in the secondary circuit has its primary circuit connected to a 400V a.c. source. It is found that when a heater is connected to the secondary circuit, it produces heat at the rate of 600W. Assuming 100% efficiency, determine the:
i) voltage in the secondary circuit.
ii) current in the primary circuit.
iii) current in the secondary circuit.
Date posted: September 30, 2019. Answers (1)
- The cost of electricity per kilowatt hour- kWh is Ksh.8, determines how much a household running a device rated 1500W continuously for 1.08 x 105...(Solved)
The cost of electricity per kilowatt hour- kWh is Ksh.8, determines how much a household running a device rated 1500W continuously for 1.08 x 105 seconds, would pay.
Date posted: September 30, 2019. Answers (1)
- A uniform resistance wire of length 2.0m conducts a current of 0.25A when connected in series with a cell of e.m.f of 1.6V. How much...(Solved)
A uniform resistance wire of length 2.0m conducts a current of 0.25A when connected in series with a cell of e.m.f of 1.6V. How much current would be conducted if the wire is now cut into 2 equal lengths which are then arranged in parallel.
Date posted: September 30, 2019. Answers (1)
- Diagram below represents a metre bridge used to determine the resistance of an electrical component, X.(Solved)
Diagram below represents a metre bridge used to determine the resistance of an electrical component, X.
From the diagram,
i) Explain why wide brass strips are used as terminals.
ii) Explain why a cell of low e.m.f is preferable.
iii) If null deflection was obtained when l1 was 60.0cm. Calculate the resistance of component marked X.
iv) State three ways of ensuring that the error is minimized.
Date posted: September 30, 2019. Answers (1)
- Diagram below is a resistor-capacitor circuit. At time t = 0, the switch is closed at A for some time and then opened. The switch...(Solved)
Diagram below is a resistor-capacitor circuit. At time t = 0, the switch is closed at A for some time and then opened. The switch is then closed at B for some time.
On the axes provided below, sketch graph of voltage V across the capacitor against time t (t1 and t2 represent time for opening at A and closing at B respectively).
Date posted: September 30, 2019. Answers (1)
- A small coin lies at the bottom of a water pond at a depth of 1.2m. How far from the water surface does the observer...(Solved)
A small coin lies at the bottom of a water pond at a depth of 1.2m. How far from the water surface does the observer see it,given the speed of light in water is 2.3 x 108m/s and velocity of light in air is 3.0 x 108m/s.
Date posted: September 30, 2019. Answers (1)
- The figure below shows two spherical materials, one an insulation conductor and the other a conductor. Negative charges are introduced at point A in each...(Solved)
The figure below shows two spherical materials, one an insulation conductor and the other a conductor. Negative charges are introduced at point A in each case.
On the same figure indicate the final position of the charges. Explain your answer.
Date posted: September 30, 2019. Answers (1)
- The figure below shows a plastic bottle having a weighted cork floating on water inside the bottle.When the sides of the bottle are squeezed the...(Solved)
The figure below shows a plastic bottle having a weighted cork floating on water inside the bottle.When the sides of the bottle are squeezed the cork sinks.
Explain the observation.
Date posted: September 30, 2019. Answers (1)
- 50g of ice at -5oC is dropped in a well lagged copper calorimeter of mass 30g having 150g of water at 80oC. A final steady...(Solved)
50g of ice at -5oC is dropped in a well lagged copper calorimeter of mass 30g having 150g of water at 80oC. A final steady temperature of 35oC is attained. Determine specific heat capacity of ice.(Take specific heat capacity of water = 4200J/kg/k, specific latent heat of fusion of ice = 340,00J/kg and specific heat capacity of copper = 390J/kg/k)
Date posted: September 30, 2019. Answers (1)
- The figure below shows two cars A and B moving in opposite direction along a straight road. The diagram shows their respective positions at equal...(Solved)
The figure below shows two cars A and B moving in opposite direction along a straight road. The diagram shows their respective positions at equal time intervals before the crush until the cars collided at point M. The diagram is drawn to scale of 1:10
i) Explain which driver had anticipated the collision.
ii) If the time between all the intervals was 0.5 seconds.
I. Determine the velocities Vp, VQ and VR
II. Car A had a mass of 8000kg while B had a mass of 1200kg. The cars coellesced and moved together a distance of 8m before coming to rest.
Determine:
I. The velocity after collision.
II.The common acceleration
Date posted: September 30, 2019. Answers (1)
- The figure below shows a turn table, centre O with a mass of 30g at a distance of 6cm from the centre.(Solved)
The figure below shows a turn table, centre O with a mass of 30g at a distance of 6cm from the centre.
i) Determine the normal reaction between the 30g mass and the table. (2 marks)
ii) The 30g mass just slides off the table when the turn table rotates at a frequency of 1 revolution per second. Determine:
I. The angular velocity.
II. The coefficient of friction between the 30g mass and the table.
iii) Oil is poured on the table and the table is made to rotate at the same frequency of 1 revolution per second. On the figure,mark a point P along line OB where the 30g mass will just slide off.
Date posted: September 30, 2019. Answers (1)