High concentration of positive charges at the sharp point causes ionization to provide electrons and positive ions,electrons are attracted to the wire while positive ions drift towards the flame forming an electric wind which deflects the flame.
sharon kalunda answered the question on September 26, 2019 at 06:46
-
Explain why it is dangerous for a bus to carry standing passengers.
(Solved)
Explain why it is dangerous for a bus to carry standing passengers.
Date posted:
September 26, 2019
.
Answers (1)
-
The diagram below shows a wire loop with two threads tied across it. The loop is dipped into a soap solution such that the soap...
(Solved)
The diagram below shows a wire loop with two threads tied across it. The loop is dipped into a soap solution such that the soap film covers it as shown.
Region B is punctured such that the soap film in that section is broken. On the space alongside the diagram sketch the resulting shape of the wire loop. Give a reason for the shape.
Date posted:
September 26, 2019
.
Answers (1)
-
In an experiment to determine the density of sand using a density bottle, the following measurements were recorded:
(Solved)
In an experiment to determine the density of sand using a density bottle, the following measurements were recorded:
Mass of empty density bottle = 43.2g
Mass of density bottle full of water = 66.4g
Mass of density bottle with some sand = 67.5g
Mass of density bottle with the sand filled up with water = 82.3g
Use the above data to determine the;
a) Mass of the water that completely filled the bottle.
b) Volume of water that completely filled with the bottle.
c) Volume of the density bottle;
d) Mass of sand
e) Mass of water that filled the space above the sand.
f) Volume of the sand
g) Density of the sand
Date posted:
September 12, 2019
.
Answers (1)
-
The distance between an upright image and the object produced by a thin lens is 40cm. The image is 3 times as tall as the...
(Solved)
The distance between an upright image and the object produced by a thin lens is 40cm. The image is 3 times as tall as the object.
i) State the type of lens used.
ii) Determine the object distance.
iii) Determine the radius of curvature.
iv) State one application of the lens as used in question (b) above.
Date posted:
September 12, 2019
.
Answers (1)
-
The figure below shows a rectangular object of mass 100kg tethered to the sea-bed by a wire. The dimension are 4m ×1.5m × 2m
(Solved)
The figure below shows a rectangular object of mass 100kg tethered to the sea-bed by a wire. The dimension are 4m ×1.5m × 2m
Calculate the:
i) Weight of sea water displaced by the buoy (density of sea water = 1100kgm-3)
ii) Upward force exerted on the buoy by the water.
iii) The tension on the string.
Date posted:
September 12, 2019
.
Answers (1)
-
The figure below shows a bimetallic strip in electric circuit made of two metals A and B. B expands more than A.
(Solved)
The figure below shows a bimetallic strip in electric circuit made of two metals A and B. B expands more than A.
X and Y are metal contact while P and Q are identical bulbs. Explain the effect on the bulb when ice cold water is poured onto the strip.
Date posted:
September 12, 2019
.
Answers (1)
-
Three identical springs each of spring constant 10N/m and weight 0.5N are used to support a load as shown.
(Solved)
Three identical springs each of spring constant 10N/m and weight 0.5N are used to support a load as shown.
Determine the total extension of the system.
Date posted:
September 12, 2019
.
Answers (1)
-
Give a reason why lecture theatre halls are covered with soft perforated materials.
(Solved)
Give a reason why lecture theatre halls are covered with soft perforated materials.
Date posted:
September 12, 2019
.
Answers (1)
-
A car of mass 800kg starts and accelerates at 1.2ms-2. Determine its momentum after it has moved 400m from the starting point.
(Solved)
A car of mass 800kg starts and accelerates at 1.2ms-2. Determine its momentum after it has moved 400m from the starting point.
Date posted:
September 12, 2019
.
Answers (1)
-
Explain the energy change that occur when a man climbs the mountain.
(Solved)
Explain the energy change that occur when a man climbs the mountain.
Date posted:
September 12, 2019
.
Answers (1)
-
Calculate the impulse of force produced when a table is pulled for 3 seconds by a constant force of 10N towards the right and then...
(Solved)
Calculate the impulse of force produced when a table is pulled for 3 seconds by a constant force of 10N towards the right and then for 2 seconds by a constant force of 20N towards the left.
Date posted:
September 12, 2019
.
Answers (1)
-
A stone is thrown vertically upwards from the base of a mountain with an initial velocity of 100m/s. The stone just stopped as the apex and...
(Solved)
A stone is thrown vertically upwards from the base of a mountain with an initial velocity of 100m/s. The stone just stopped as the apex and came back. Another boy projected a stone horizontally from the top of the mountain. Calculate:
(a) Height of the mountain.
(b) Time taken for the stone to follow the trajectory.
(c) The range if the horizontal velocity is 20m/s.
Date posted:
September 12, 2019
.
Answers (1)
-
A pipe of radius 2mm is connected to another pipe of radius 6mm. If water flows in the narrow pipe at a speed of 3m/s,determine...
(Solved)
A pipe of radius 2mm is connected to another pipe of radius 6mm. If water flows in the narrow pipe at a speed of 3m/s,determine the speed of water in the wider pipe.
Date posted:
September 12, 2019
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)