Initially the air above the graze has not reached the ignition temperatures after sometime the heat from the graze raises the temperature above it to its ignition temperature.
Kavungya answered the question on May 21, 2019 at 06:49
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The figure below shows a uniform bar pivoted at its centre and is at equilibrium.
Determine the value of w.
(Solved)
The figure below shows a uniform bar pivoted at its centre and is at equilibrium.
Determine the value of w.
Date posted:
May 21, 2019
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Answers (1)
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An immersion heater rated at 180W is placed in a liquid of mass 2kg. When the heater is switched on for 7.5 minutes the temperature...
(Solved)
An immersion heater rated at 180W is placed in a liquid of mass 2kg. When the heater is switched on for 7.5 minutes the temperature of the liquid rises by 400C. Determine the specific heat capacity of the liquid.
Date posted:
May 21, 2019
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Answers (1)
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Other than oil patch being monolayer, state any one other assumption in the oil drop experiment.
(Solved)
Other than oil patch being monolayer, state any one other assumption in the oil drop experiment.
Date posted:
May 21, 2019
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Answers (1)
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Estimate the size of an oil molecule if a drop of oil of volume 6.0 × 10-10 m3 forms a patch of 32 on a water...
(Solved)
Estimate the size of an oil molecule if a drop of oil of volume 6.0 × 10-10 m3 forms a patch of 32 on a water surface.
Date posted:
May 21, 2019
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Answers (1)
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The following figure shows a rod made of wood on one end and metal on the other end
suspended freely with a piece of thread so...
(Solved)
The following figure shows a rod made of wood on one end and metal on the other end
suspended freely with a piece of thread so that it is in equilibrium.
The side made of metal is now heated with a Bunsen flame. State with a reason, the side to
which the rod is likely to tilt
Date posted:
May 21, 2019
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Answers (1)
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A stone of mass 40g was completely immersed in a liquid. The level of liquid are shown in the figure. Determine the density of the stone in...
(Solved)
A stone of mass 40g was completely immersed in a liquid. The level of liquid are shown in the figure
Determine the density of the stone in SI units
Date posted:
May 21, 2019
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Answers (1)
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In the clothing and textile industries the machines experience electrostatic forces at certain points. Suggest one method of reducing these forces
(Solved)
In the clothing and textile industries the machines experience electrostatic forces at certain points. Suggest one method of reducing these forces
Date posted:
May 21, 2019
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Answers (1)
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A wire was connected to a battery and was found that the energy converted to heat was 30J when 20C of charge flowed through the...
(Solved)
A wire was connected to a battery and was found that the energy converted to heat was 30J when 20C of charge flowed through the wire in 5 seconds. Calculate;
i) The p.d between the ends of the wire
ii) The current flowing through the wire
iii)The resistance of the wire
iv)The average power development in the wire
Date posted:
May 20, 2019
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Answers (1)
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Sketch a simple diagram that contains a capacitor, a two way switch, and a load resistor that can be used for charging and discharging a...
(Solved)
Sketch a simple diagram that contains a capacitor, a two way switch, and a load resistor that can be used for charging and discharging a capacitor.
Date posted:
May 20, 2019
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Answers (1)
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Figure below shows a ray of light incident on the face of a cube made of glass refractive index 1.50. Calculate (i) The angle r: (ii) The critical...
(Solved)
Figure below shows a ray of light incident on the face of a cube made of glass refractive index 1.50
Calculate
i) The angle r:
ii) The critical angle for the glass air interface
Date posted:
May 20, 2019
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Answers (1)
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A gun is fired and an echo heard at the same place 0.6s later. How far is the barrier, which reflected the sound from the...
(Solved)
A gun is fired and an echo heard at the same place 0.6s later. How far is the barrier, which reflected the sound from the gun? (Speed of sound in air=330ms-1
Date posted:
May 20, 2019
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Answers (1)
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Figure below shows two plane mirrors inclined at an angle x from each other. A viewer counts a total of seven images by looking directly...
(Solved)
Figure below shows two plane mirrors inclined at an angle x from each other. A viewer counts a total of seven images by looking directly from the object O. Determine value of angel x.
Date posted:
May 20, 2019
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Answers (1)
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The figure below shows an inclined plane used to load heavy luggage onto a lorry. The length of the plane is L metres and the...
(Solved)
The figure below shows an inclined plane used to load heavy luggage onto a lorry. The length of the plane is L metres and the height is h metres
Show that the velocity ratio is given by 1/sin??
Date posted:
May 20, 2019
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Answers (1)
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An immersion heater rated 2.5Kw is immersed into a plastic jug containing 21kg of water and switched on for four minutes .Determine:
i) The quantity of...
(Solved)
An immersion heater rated 2.5Kw is immersed into a plastic jug containing 21kg of water and switched on for four minutes .Determine:
i) The quantity of heat gained by water
ii) The temperature change for water.(specific heat capacity of water=4.2×103Jkg-1k-1
Date posted:
May 20, 2019
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Answers (1)
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Explain why an air bubble increase in volume as it rises from the bottom of a lake to the surface
(Solved)
Explain why an air bubble increase in volume as it rises from the bottom of a lake to the surface
Date posted:
May 20, 2019
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Answers (1)
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A piece of wire of length 12m is stretched through 2.5cm by a mass of 5 kg. assuming that the wire obeys the Hookes law,...
(Solved)
A piece of wire of length 12m is stretched through 2.5cm by a mass of 5 kg. assuming that the wire obeys the Hookes law, what force will stretch it through 4.0 cm.
Date posted:
May 20, 2019
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Answers (1)
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An object of the mass 150kg moving at 20m/s collides with a stationary object of mass 90kg.They couple after collision .Determine the :
(i) Total momentum...
(Solved)
An object of the mass 150kg moving at 20m/s collides with a stationary object of mass 90kg.They couple after collision .Determine the :
(i) Total momentum before collision
(ii) Total momentum after collision
(iii) Their common velocity after collision
Date posted:
May 20, 2019
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Answers (1)
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State what provides centripetal force for an electron moving round the nucleus.
(Solved)
State what provides centripetal force for an electron moving round the nucleus.
Date posted:
May 20, 2019
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Answers (1)
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The figure below shows a metallic rod of length 10cm and uniform cross-sectional area 4cm2 suspended from spring balance with 7.5 cm of its length...
(Solved)
The figure below shows a metallic rod of length 10cm and uniform cross-sectional area 4cm2 suspended from spring balance with 7.5 cm of its length immersed in water. The density of the material is 1.5g/cm3.The density of water is 1 g/cm3
Determine:
i) The mass of the rod
ii) The upthrust acting on the rod
iii) The reading 0f the spring balance
iv) The reading of the spring balance when the rod is wholly immersed in water
Date posted:
May 20, 2019
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Answers (1)
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The figure below shows velocity-time graphs of two objects A and B drawn on same axes
The two objects are of equal masses. The same size...
(Solved)
The figure below shows velocity-time graphs of two objects A and B drawn on same axes
The two objects are of equal masses. The same size of force is applied against each object. State
with a reason which of the two objects stops in a shorter distance.
Date posted:
May 20, 2019
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Answers (1)