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- A string of negligible mass has a bucket tied at the end. The string is 60cm long and the buckets has a mass of 45g....(Solved)
A string of negligible mass has a bucket tied at the end. The string is 60cm long and the buckets has a mass of 45g. The bucket is swung horizontally making 6 revolutions per second. Calculate:
(i) The angular velocity.
(ii) The centripetal acceleration.
(iii) The tension on the string.
(iv) The linear velocity.
Date posted: June 1, 2019.
- A block of length 50 cm, cross-sectional area of 5cm2 and density 1.4 g/cm3 is completely immersed in a liquid of density 1.08 g/cm3 find
(i)...(Solved)
A block of length 50 cm, cross-sectional area of 5cm2 and density 1.4 g/cm3 is completely immersed in a liquid of density 1.08 g/cm3 find
(i) The mass of the block
(ii) The weight of the block in the liquid.
(iii) The apparent loss in weight of the block if three quarter of it is immersed in the liquid.
Date posted: June 1, 2019.
- An object is released to fall vertically from height of 100m. At the same time another object is projected vertically upward with velocity of 40m/s.
(i)...(Solved)
An object is released to fall vertically from height of 100m. At the same time another object is projected vertically upward with velocity of 40m/s.
(i) Calculate the time taken before the objects meet
(ii) At what height do the objects meet?
Date posted: June 1, 2019.
- James applied a force of 400N in pushing a stationary wall. If he took one hour to push the wall, calculate the power developed.(Solved)
James applied a force of 400N in pushing a stationary wall. If he took one hour to push the wall, calculate the power developed.
Date posted: June 1, 2019.
- A balloon filled with argon gas of volume 200 cm3 at the earth’s surface where the temperature is 200C, and the pressure 760mm of mercury....(Solved)
A balloon filled with argon gas of volume 200 cm3 at the earth’s surface where the temperature is 200C, and the pressure 760mm of mercury. If it is allowed to ascend to a height where the temperature is 0C and the pressure 100mm of mercury, calculate the volume of the balloon.
Date posted: June 1, 2019.
- In a faulty mercury-in-glass thermometer was found that the mercury level stands at 3 cm mark in the tube at 00 C and 18 cm...(Solved)
In a faulty mercury-in-glass thermometer was found that the mercury level stands at 3 cm mark in the tube at 00 C and 18 cm when in steam above boiling water at normal atmospheric pressure. Calculate the temperature when the mercury stands at 12 cm mark.
Date posted: June 1, 2019.
- A vernier caliper which had an error of 0.02cm was used to measure the diameter of a spherical marble. If the actual diameter was 3.67cm,...(Solved)
A vernier caliper which had an error of 0.02cm was used to measure the diameter of a spherical marble. If the actual diameter was 3.67cm, draw a vernier caliper scale showing its reading
Date posted: June 1, 2019.
- State the name of the instrument used to take the following readings;
(i) 0.035m
(ii) 0.00245m(Solved)
State the name of the instrument used to take the following readings;
(i) 0.035m
(ii) 0.00245m
Date posted: June 1, 2019.
- The refractive indices of water and glass are 3/2 and 4/3 respectively. Find the value of theta in the figure below.(Solved)
The refractive indices of water and glass are 3/2 and 4/3 respectively. Find the value of theta in the figure below.
Date posted: June 1, 2019.
- The speed of green light in a prism is 1.94 x 108m/s.
(i) Determine the refractive index of the prism material. (Speed of light in air...(Solved)
The speed of green light in a prism is 1.94 x 108m/s.
(i) Determine the refractive index of the prism material. (Speed of light in air = 3.0 x 108m/s).
(ii) Determine the critical angle of the prism material.
Date posted: June 1, 2019.
- A coin is placed beneath a transparent block of thickness 10cm and refractive index 1.56. Calculate the vertical displacement of the coin.(Solved)
A coin is placed beneath a transparent block of thickness 10cm and refractive index 1.56. Calculate the vertical displacement of the coin.
Date posted: June 1, 2019.
- 54kg of water in a metallic cylinder of heat capacity 9000JK¯¹ is heated from 10°C to 80°C using an immersion heater rated 1800W, 240V. Assuming...(Solved)
54kg of water in a metallic cylinder of heat capacity 9000JKˉ¹ is heated from 10°C to 80°C using an immersion heater rated 1800W, 240V. Assuming that no heat is lost to the surrounding and the immersion heater works at its correct
voltage. Find.
i) The current flowing through the water.
ii) The cost of heating the same mass of water from 10°C to 80°C, every day for 30 days, if electricity cost sh.6.70 per unit.
Date posted: May 31, 2019.
- Figure below shows a section of a house wiring system.
i) Name:
I The circuit labelled F.
II The terminals A and B.
ii) Give a reason why...(Solved)
Figure below shows a section of a house wiring system.
i) Name:
I The circuit labelled F.
II The terminals A and B.
ii) Give a reason why R is connected to B and not A.
iii) What is R?
iv) Why is earthing necessary in such a circuit?
Date posted: May 31, 2019.
- Long distance transmission of power is done at a very high voltage. Explain.(Solved)
Long distance transmission of power is done at a very high voltage. Explain.
Date posted: May 31, 2019.
- The diagram below shows part of a waveform. The numbers on the diagram show scales in metres; if the speed of the wave is 20ms¯¹,...(Solved)
The diagram below shows part of a waveform. The numbers on the diagram show scales in metres; if the speed of the wave is 20msˉ¹, determine the frequency and wavelength of the wave.
Date posted: May 31, 2019.
- A student designed an a.c. generator which produces a current of 10A at a p.d. of 340V. State two ways in which he can improve...(Solved)
A student designed an a.c. generator which produces a current of 10A at a p.d. of 340V. State two ways in which he can improve his generator to increase the p.d. output.
Date posted: May 31, 2019.
- A Bunsen burner flame brought near to the cap of a charged electroscope causes the divergence of the leaf to decrease. Explain these observations.(Solved)
A Bunsen burner flame brought near to the cap of a charged electroscope causes the divergence of the leaf to decrease. Explain these observations.
Date posted: May 31, 2019.
- Explain why sound cannot be heard from far when one shouts in a forest.(Solved)
Explain why sound cannot be heard from far when one shouts in a forest.
Date posted: May 31, 2019.
- The figure below shows the trace of a signal on CRO.
Given that the time base is set at 100ms/div., determine the frequency of the signal.(Solved)
The figure below shows the trace of a signal on CRO.
Given that the time base is set at 100ms/div., determine the frequency of the signal.
Date posted: May 31, 2019.
- The diagram below shows the image formed by a convex mirror. Complete the diagram to show the position of the object.(Solved)
The diagram below shows the image formed by a convex mirror. Complete the diagram to show the position of the object.
Date posted: May 31, 2019.
- A body of mass 5kg is attached to the end of a string of length 50cm and whirled continuously in a horizontal circle. If the...(Solved)
A body of mass 5kg is attached to the end of a string of length 50cm and whirled continuously in a horizontal circle. If the tension in the string is 81N determine the angular velocity of the body
Date posted: May 31, 2019.
- A pulley system having a velocity ratio of 4 is used to raise a load of 80N through a height of 0.6m at a constant...(Solved)
A pulley system having a velocity ratio of 4 is used to raise a load of 80N through a height of 0.6m at a constant speed using an effort of 20N in a time of 15 seconds. Calculate the power developed by the effort
Date posted: May 31, 2019.
- A spring with a spring constant of 68N/M stretches by 0.22m when a force is applied on it. Determine the energy stored in the stretched...(Solved)
A spring with a spring constant of 68N/M stretches by 0.22m when a force is applied on it. Determine the energy stored in the stretched spring.
Date posted: May 31, 2019.
- A bullet of mass 20g travelling at 400m/s is strapped by a concrete wall. calculate the amount of energy transferred to the wall(Solved)
A bullet of mass 20g travelling at 400m/s is strapped by a concrete wall. calculate the amount of energy transferred to the wall
Date posted: May 31, 2019.
- Name a device that is used to convert sound energy to electrical energy(Solved)
Name a device that is used to convert sound energy to electrical energy
Date posted: May 31, 2019.
- Distinguish between velocity ratio and mechanical advantage(Solved)
Distinguish between velocity ratio and mechanical advantage
Date posted: May 31, 2019.
- A body weighs 40N in air, 30N in water and 35N when in liquid X. Find the relative density of liquid X(Solved)
A body weighs 40N in air, 30N in water and 35N when in liquid X. Find the relative density of liquid X
Date posted: May 31, 2019.
- A constant mass of hydrogen gas occupies a volume of 4.0cm3 at a pressure of 2.4x105 Pa and temperature of 288k. Find its volume at...(Solved)
A constant mass of hydrogen gas occupies a volume of 4.0cm3 at a pressure of 2.4x105 Pa and temperature of 288k. Find its volume at a pressure of 1.6x105Pa when the temperature is 293K
Date posted: May 31, 2019.
- Two liquids of density 1100kg/m3 and 850kg/m3 are mixed in equal volumes. The mixture fills a tank of 300cmx 40cm x 50cm to the bring...(Solved)
Two liquids of density 1100kg/m3 and 850kg/m3 are mixed in equal volumes. The mixture fills a tank of 300cmx 40cm x 50cm to the bring calculate the mass of each liquid
Date posted: May 31, 2019.
- A vessel weighs 90g and has a specific heat capacity of 420J/Kg/K. Calculate its heat capacity(Solved)
A vessel weighs 90g and has a specific heat capacity of 420J/Kg/K. Calculate its heat capacity
Date posted: May 31, 2019.