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A spring extends by 4cm when a load of 10N is suspended from it. Six similar springs are used in the system shown in figure.Determine...
(Solved)
A spring extends by 4cm when a load of 10N is suspended from it. Six similar springs are used in the system shown in figure.Determine the total extension.
Date posted:
September 12, 2019
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Answers (1)
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Under what conditions can a feather and a stone released from the same height land on the ground at the same time?
(Solved)
Under what conditions can a feather and a stone released from the same height land on the ground at the same time?
Date posted:
September 12, 2019
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Answers (1)
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The figure below shows a micrometer screw gauge that has a zero error of +0.02. State the actual reading of the micrometer screw gauge.
(Solved)
The figure below shows a micrometer screw gauge that has a zero error of +0.02. State the actual reading of the micrometer screw gauge.
Date posted:
September 12, 2019
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Answers (1)
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The figure below shows a match stick floating on the surface of water in a basin.
(Solved)
The figure below shows a match stick floating on the surface of water in a basin.
When a drop of soap solution was carefully added to the water at A, the match stick is observed to move in a certain direction. State the direction of this match using A and B and explain this observation.
Date posted:
September 11, 2019
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Answers (1)
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A heating element rated 2.5 KW is used to raise the temperature of 3.0 kg of water through 500C. Calculate the time required to effect...
(Solved)
A heating element rated 2.5 KW is used to raise the temperature of 3.0 kg of water through 500C. Calculate the time required to effect this. (Specific heat capacity of water is 4200 J/kgK)
Date posted:
September 11, 2019
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Answers (1)
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The figure below shows two conducting wires A and B passing through a horizontal piece of cardboard.
(Solved)
The figure below shows two conducting wires A and B passing through a horizontal piece of cardboard.
(a) Sketch the resultant magnetic field patterns when the currents of the high magnitude are flowing in both wires as shown.
(b) What is the resulting effect of the field on the wires at the loose ends?
Date posted:
September 11, 2019
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Answers (1)
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The figure below shows a rectangular block of wood attached to a spring balance being pulled gently by a pulling force P at a steady...
(Solved)
The figure below shows a rectangular block of wood attached to a spring balance being pulled gently by a pulling force P at a steady velocity.
i. A graph of pulling force against time was drawn as shown below.
I. State the forces FA and FB.
II. From the graph, state what happens to the block of wood between point P and Q. (1mk)
ii. Given that the wooden box has a mass of 2.0kg and requires force of 5N to pull it with uniform speed along a horizontal surface, calculate the coefficient of friction between the surface and the block. Take (g = 10N/kg).
Date posted:
September 11, 2019
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Answers (1)
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The figure below shows a uniform metal rod of mass 100g balanced over a pivot using a spring balance and a mass of 300g.Calculate the...
(Solved)
The figure below shows a uniform metal rod of mass 100g balanced over a pivot using a spring balance and a mass of 300g.Calculate the tension in the spring.
Date posted:
September 11, 2019
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Answers (1)
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The figure below shows a section of a micrometer screw gauge used by a student to measure the diameter of a wire. Determine the cross-sectional...
(Solved)
The figure below shows a section of a micrometer screw gauge used by a student to measure the diameter of a wire. Determine the cross-sectional area of the wire.
Date posted:
September 11, 2019
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Answers (1)
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A transformer has 1000 turns in its secondary coil and 10 turns on its primary coil. An alternating current of 2.5A flows in the primary...
(Solved)
A transformer has 1000 turns in its secondary coil and 10 turns on its primary coil. An alternating current of 2.5A flows in the primary circuit when it is connected to a 12V a.c. supply.
(i) State the type of transformer.
(ii) Calculate the power input to the transformer.
(iii) Calculate the e.m.f. across the secondary coil.
(iv) Determine the maximum current that could flow in a circuit connected to the secondary coil if the transformer is 80% efficient. (Use the e.m.f in secondary as calculated in (iii) above).
Date posted:
September 11, 2019
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Answers (1)
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The figure below shows a circuit with a coil used to warm oil in a beaker.
(Solved)
The figure below shows a circuit with a coil used to warm oil in a beaker.
(i) Explain how heat is produced in the coil.
(ii) Given that the reading of the ammeter is 2.5A, determine the resistance of the coil.
(iii) How much heat is produced in the coil in a minute?
(iv) Give two changes that can be made in the set-up in order to produce more heat per minute.
Date posted:
September 11, 2019
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Answers (1)
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A policeman standing between two high walls fires a gun. He hears the first echo after 3 seconds and the next 2 seconds later. What...
(Solved)
A policeman standing between two high walls fires a gun. He hears the first echo after 3 seconds and the next 2 seconds later. What is the distance between the wall. (Take velocity of sound = 330m/s).
Date posted:
September 11, 2019
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Answers (1)
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Two magnets A and B in the figure below were brought from a point high above a table towards a steel pin.State with a reason...
(Solved)
Two magnets A and B in the figure below were brought from a point high above a table towards a steel pin.
State with a reason which magnet will attract the pin at a bigger height above the table.
Date posted:
September 11, 2019
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Answers (1)
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A rock of mass 150kg moving at 10m/s collides with a stationary rock of mass 100kg. They fuse after collision.Determine the
(i) Total momentum before collision....
(Solved)
A rock of mass 150kg moving at 10m/s collides with a stationary rock of mass 100kg. They fuse after collision.Determine the
(i) Total momentum before collision.
(ii) Total momentum after collision.
(iii) Their common velocity after collision.
Date posted:
September 11, 2019
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Answers (1)
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The figure below shows a balloon filled with air.When the mouth is suddenly opened, the balloon moves in the direction shown by the arrow. Explain...
(Solved)
The figure below shows a balloon filled with air.When the mouth is suddenly opened, the balloon moves in the direction shown by the arrow. Explain that observation.
Date posted:
September 11, 2019
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Answers (1)
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Give a reason why the inside of a helmet is lined with sponge.
(Solved)
Give a reason why the inside of a helmet is lined with sponge.
Date posted:
September 11, 2019
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Answers (1)
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The figure below represents a block of uniform cross-sectional area 6.0cm² floating on two liquids A and B. The length of the block in each...
(Solved)
The figure below represents a block of uniform cross-sectional area 6.0cm² floating on two liquids A and B. The length of the block in each liquid is shown.
Given that the density of liquid A is 800kg/m³ and that of liquid B is 1000kg/m³
determine.
(i) Weight of liquid A displaced.
(ii) Weight of liquid B displaced.
(iii) Density of the block.
Date posted:
September 11, 2019
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Answers (1)
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The figure below shows two forces F1 and F2 acting on an object.Show on the same figure the resultant force.
(Solved)
The figure below shows two forces F1 and F2 acting on an object.Show on the same figure the resultant force.
Date posted:
September 11, 2019
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Answers (1)
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The figure below shows two identical burning splints. Placed on wood and metal blocks respectively it was observed that when the flame reached the edge...
(Solved)
The figure below shows two identical burning splints. Placed on wood and metal blocks respectively it was observed that when the flame reached the edge of the metal block the splint was extinguished while the other on the wooden block continued to burn. Explain this observation.
Date posted:
September 11, 2019
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Answers (1)
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When washing clothes, it is easier to remove the dirt using some warm water containing soap than cold water. Explain this observation.
(Solved)
When washing clothes, it is easier to remove the dirt using some warm water containing soap than cold water. Explain this observation.
Date posted:
September 11, 2019
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Answers (1)