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A heater of resistance R1 is rated P watts, V volts while another of resistance R2 is rated 2P watts, V/2 volts. Determine the ratio...
(Solved)
A heater of resistance R1 is rated P watts, V volts while another of resistance R2 is rated 2P watts, V/2 volts. Determine the ratio R1 to R2.
Date posted:
September 10, 2019
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Answers (1)
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State the name of the eye defect corrected by convex lens.
(Solved)
State the name of the eye defect corrected by convex lens.
Date posted:
September 10, 2019
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Answers (1)
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The figure below shows the path of light through a transparent material placed in air.
(Solved)
The figure below shows the path of light through a transparent material placed in air.
Calculate the refractive index of the transparent material.
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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The figure below shows a progressive wave incident from a shallow end to a deep end.
(Solved)
The figure below shows a progressive wave incident from a shallow end to a deep end.
Sketch the appearance of the wave in the deep region.
Date posted:
September 10, 2019
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Answers (1)
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The figure below shows an object placed infront of a concave mirror.Use rays to locate the position of the image.
(Solved)
The figure below shows an object placed infront of a concave mirror.Use rays to locate the position of the image.
Date posted:
September 10, 2019
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Answers (1)
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A string of length 70cm is used to whirl a stone of mass 0.5kg in a circle of a vertical plane at 5 rev/s. Determine.
(i)...
(Solved)
A string of length 70cm is used to whirl a stone of mass 0.5kg in a circle of a vertical plane at 5 rev/s. Determine.
(i) The period.
(ii) The angular velocity.
(iii) The centripetal force.
Date posted:
September 10, 2019
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Answers (1)
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A student heated some water and noticed that it boiled at 102ºC. State one possible reason for this observation.
(Solved)
A student heated some water and noticed that it boiled at 102ºC. State one possible reason for this observation.
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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The figure below shows a pulley system with the load rising at uniform speed.
(Solved)
The figure below shows a pulley system with the load rising at uniform speed.
From the information given, calculate:
(i) The velocity ratio of the machine.
(ii) Mechanical advantage of the machine.
(iii) Efficiency of the machine.
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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You are provided with a 12V a.c. source, four diodes and a resistor.
(i) Draw a circuit diagram for full wave rectifier and show the points...
(Solved)
You are provided with a 12V a.c. source, four diodes and a resistor.
(i) Draw a circuit diagram for full wave rectifier and show the points at which the output is taken.
(ii) Sketch a graph of voltage against time before rectification.
(iii) Sketch a voltage – time graph after rectification.
(iv) Sketch a voltage – time graph after rectification with a capacitor connected across the resistor in (i)
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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Draw the electric field pattern in the figure below.
(Solved)
Draw the electric field pattern in the figure below.
Date posted:
September 9, 2019
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Answers (1)
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A transformer supplies 12V when it is connected to 240V supply of electricity. The output of the transformer is connected to 12V 36W bulb. The...
(Solved)
A transformer supplies 12V when it is connected to 240V supply of electricity. The output of the transformer is connected to 12V 36W bulb. The current drawn from the supply by the transformer is 0.5A. Calculate:
(i) the input power of the transformer.
(ii) the current drawn from the transformer.
(iii) The output power of the transformer.
(iv) the efficiency of the transformer
Date posted:
September 9, 2019
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Answers (1)