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A mason uses a six wheel pulley system to raise a weight of 250N through a vertical height of 2.5m using the machine.If the mason...
(Solved)
A mason uses a six wheel pulley system to raise a weight of 250N through a vertical height of 2.5m using the machine.If the mason pulls using an effort of 500N. Calculate:
i) The velocity ratio of the pulley system.
ii) The work done by the mason.
iii) The useful work done by the pulley system.
iv) The efficiency of the system
Date posted:
September 10, 2019
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Answers (1)
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The figure below shows a block of mass 50g and density 2000kg/m3 submerged in a certain liquid and suspended from uniform horizontal beam by means...
(Solved)
The figure below shows a block of mass 50g and density 2000kg/m3 submerged in a certain liquid and suspended from uniform horizontal beam by means of a string. A mass of 40g suspended from the other end of the beam puts the system in equilibrium

(i) Determine the up-thrust force acting on the block.
(ii) Calculate the density of the liquid.
(iii) Calculate the new balance point of the 50g mass (the 40g mass remains fixed) if the liquid was replace with one whose density was 1500kg/m3.
Date posted:
September 10, 2019
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Answers (1)
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A bullet moving at a velocity of 350m/s hits a tree trunk of diameter 70cm. It emerge from the opposite side with a velocity of...
(Solved)
A bullet moving at a velocity of 350m/s hits a tree trunk of diameter 70cm. It emerge from the opposite side with a velocity of 180m/s. Determine the average deceleration of the bullet in the trunk.
Date posted:
September 10, 2019
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Answers (1)
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The figure below shows an arrangement to demonstrate diffusion through solids.
(Solved)
The figure below shows an arrangement to demonstrate diffusion through solids.

The hydrogen gas is supplied for sometimes then stopped and the beaker removed. State and explain what is likely t be observed when the hydrogen gas supply is stopped.
Date posted:
September 10, 2019
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Answers (1)
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Xcm3 of substance A which has density 800 kg/m3 is mixed with 1000cm3 of water with a density of 1000kg/m3. The density of the mixture...
(Solved)
Xcm3 of substance A which has density 800 kg/m3 is mixed with 1000cm3 of water with a density of 1000kg/m3. The density of the mixture is 960kg/m3. Determine the value of X
Date posted:
September 10, 2019
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Answers (1)
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Water at 200C falls over a waterfall of height 40m. Calculate the temperature of water at the bottom of the waterfall if 80% of potential...
(Solved)
Water at 200C falls over a waterfall of height 40m. Calculate the temperature of water at the bottom of the waterfall if 80% of potential energy at the top is converted into heat energy
Date posted:
September 10, 2019
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Answers (1)
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A fathometer produces sound in a ship and receives two echo‘s where there is a raised sea bank. One after 2.5 seconds and the other...
(Solved)
A fathometer produces sound in a ship and receives two echo‘s where there is a raised sea bank. One after 2.5 seconds and the other after 3.0 seconds. Find the height of the raised sea bank if the velocity of sound in water is 1460m/s.
Date posted:
September 10, 2019
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Answers (1)
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State two factors that affect the efficiency of a pulley system.
(Solved)
State two factors that affect the efficiency of a pulley system.
Date posted:
September 10, 2019
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Answers (1)
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The handle of the screw-jack in the figure below is 42cm long and the pitch of the screw is 0.5cm.
(Solved)
The handle of the screw-jack in the figure below is 42cm long and the pitch of the screw is 0.5cm.

(i) Calculate the V.R of the screw jack.
(ii) Calculate the effort needed to lift the load of 1188N.
Date posted:
September 10, 2019
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Answers (1)
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A trolley of mass 5kg travelling to the right at 2m/s collides head on with another trolley of mass 3kg travelling at 4m/s to the...
(Solved)
A trolley of mass 5kg travelling to the right at 2m/s collides head on with another trolley of mass 3kg travelling at 4m/s to the left. Find their velocity after collision if the collision is perfectly inelastic.
Date posted:
September 9, 2019
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Answers (1)
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When a mass of 2kg is hang from a single spring, the spring extends by a distance x = 5cm. Determine the total extension in...
(Solved)
When a mass of 2kg is hang from a single spring, the spring extends by a distance x = 5cm. Determine the total extension in the set up below given that the springs are identical and weightless.

Date posted:
September 9, 2019
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Answers (1)
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A uniform metre rule is supported by force of 3N and 2N as shown in the figure below.Determine the weight of the half metre rule.
(Solved)
A uniform metre rule is supported by force of 3N and 2N as shown in the figure below.Determine the weight of the half metre rule.

Date posted:
September 9, 2019
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Answers (1)
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Two candles A and B of equal lengths and thickness are joined together and balanced horizontally as shown below. Candle A is lit.State and explain...
(Solved)
Two candles A and B of equal lengths and thickness are joined together and balanced horizontally as shown below. Candle A is lit.State and explain what happens after a short time.

Date posted:
September 9, 2019
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Answers (1)
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The figure below shows a burette that was initially filled to 12ml with a liquid of density 0.8g/cm³.The liquid is allowed to run out for...
(Solved)
The figure below shows a burette that was initially filled to 12ml with a liquid of density 0.8g/cm³.The liquid is allowed to run out for some time. If the volume of liquid removed from the burette has a mass of 14g,determine the final reading on the burette.

Date posted:
September 9, 2019
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Answers (1)
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The figure below shows a system of capacitors connected to 100V supply.
(Solved)
The figure below shows a system of capacitors connected to 100V supply.

(i) the value of a capacitor for the whole circuit system.
(ii) the charge through the 6µF capacitor.
(iii) the p.d across of the 8µF capacitor.
Date posted:
September 9, 2019
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Answers (1)
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The two free ends of a coil are connected to a center – zero galvanometer. When the north pole of magnet is moved towards the...
(Solved)
The two free ends of a coil are connected to a center – zero galvanometer. When the north pole of magnet is moved towards the coil, the pointer deflects in the direction shown in the figure below.

State with a reason the behaviour of the pointer inn the following cases:
(i) The north pole of the magnet is held stationary near P.
(ii) The north pole of the magnet is made to approach the coil from end Q
Date posted:
September 9, 2019
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Answers (1)
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200g of ice at 00C is added to 400g water in a well lagged calorimeter of mass 40g. The initial temperature of the water was...
(Solved)
200g of ice at 00C is added to 400g water in a well lagged calorimeter of mass 40g. The initial temperature of the water was 400C. If the final temperature of the mixture is X0C, (Specific latent of fusion of ice L = 3.36 x 105JK/g, specific heat capacity of water, c = 4200J/kg/K, specific heat capacity of copper = 400J/kg/K)
(i) Derive an expression for the amount of heat gained by ice to melt it and raise its temperature to X0C
(ii) Derive an expression for the amount of heat lost by the calorimeter and its content when their temperature falls to X0C.
(iii) Determine the value of X.
Date posted:
September 9, 2019
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Answers (1)
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Given the following. A filter funnel, a thermometer, a stop watch, ice at 00C, an immersion heater rated P watts, a beaker, a stand, boss...
(Solved)
Given the following. A filter funnel, a thermometer, a stop watch, ice at 00C, an immersion heater rated P watts, a beaker, a stand, boss and clamp and weighing machine.Describe an experiment to determine the specific latent heat of fusion of ice. Clearly state the measurements to be made.
Date posted:
September 9, 2019
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Answers (1)
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The figure below shows dots which were made by a ticker timer – tape attached to a trolley. The trolley was moving in the direction...
(Solved)
The figure below shows dots which were made by a ticker timer – tape attached to a trolley. The trolley was moving in the direction shown.

If the frequency used was 60Hz, distance AB = 12cm and BC = 7.2cm, determine
(i) The velocities between AB and BC
(ii) The acceleration of the trolley.
(b) An object is projected horizontally with a velocity of 40m/s at the top of a cliff 100m from the ground. (Take g = 10m/s2)
(i) Calculate the time taken for the object to hit the ground.
(ii) What is the range of the object from the foot of the cliff
Date posted:
September 9, 2019
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Answers (1)
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Sketch a block and tackle pulley with three movable pulleys in the lower block and two fixed pulleys in the upper block,to give a velocity...
(Solved)
Sketch a block and tackle pulley with three movable pulleys in the lower block and two fixed pulleys in the upper block,to give a velocity ratio of 6.
Find:
(i) An effort of 450N is used to raise a load of 2700N. Determine:
- Mechanical advantage (M.A)
- Efficiency of the pulley system.
(ii) If all the wasted energy is used to raise the lower block and the frictional force between pulleys and moving parts is 3.6N; determine the weight of the lower block.
(iii) If the load moved through a distance of 50cm, determine the useful work done by the effort.
Date posted:
September 9, 2019
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Answers (1)