a) X - rays must be reflected from B.
b) Cathode - to emit electrons and focus them to the anode.
c) A - copper good conductor heat.
B - tungsten /molybdenum - has high melting point.
d) To enhance cooling of the copper anode.
sharon kalunda answered the question on May 30, 2019 at 11:17
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Explain why it is not advisable to use a 10A fuse for a hair dryer rated 2.5Kw, 240V.
(Solved)
Explain why it is not advisable to use a 10A fuse for a hair drier rated 2.5Kw, 240V.
Date posted:
May 30, 2019
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Answers (1)
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State how polarization is reduced in a simple cell.
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State how polarization is reduced in a simple cell.
Date posted:
May 30, 2019
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Answers (1)
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Find the combined capacitance between points A and B of the arrangement shown in the figure below.
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Find the combined capacitance between points A and B of the arrangement shown in the figure below.
Date posted:
May 30, 2019
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Answers (1)
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Explain why the cathode of a CRO is coated with oxides of metals such as Barium and Strontium.
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Explain why the cathode of a CRO is coated with oxides of metals such as Barium and Strontium.
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows a coil and a magnet being removed from the coil.
a) State the polarity gained at end B.
b) Indicate the direction...
(Solved)
The figure below shows a coil and a magnet being removed from the coil.
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Date posted:
May 30, 2019
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Answers (1)
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A ray from a source X makes an angle of 30° with a plane reflector and a ray from a source Y makes an angle...
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A ray from a source X makes an angle of 30° with a plane reflector and a ray from a source Y makes an angle of 60° to the
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Date posted:
May 30, 2019
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Answers (1)
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A box of mass 500g has dimension 10m × 5m × 3m. Determine the maximum pressure exerted by the box on a flat surface. (Take...
(Solved)
A box of mass 500g has dimension 10m × 5m × 3m. Determine the maximum pressure exerted by the box on a flat surface. (Take g = 10N/kg)
Date posted:
May 30, 2019
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Answers (1)
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The figure below represents a hydraulic brake.
A force of 20N is applied on the foot pedal connected to a piston of area 0.0005m² and this...
(Solved)
The figure below represents a hydraulic brake.
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iii) The velocity ratio
Date posted:
May 30, 2019
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Answers (1)
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A driver driving a car of mass 1200kg at a constant speed of 72km/h is flagged down by a traffic police officer 145m
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(Solved)
A driver driving a car of mass 1200kg at a constant speed of 72km/h is flagged down by a traffic police officer 145m
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Date posted:
May 30, 2019
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Answers (1)
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A bus of mass 5,000kg and a car of mass 1200kg are both travelling on a dual carriage way at the same velocity. If both
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(Solved)
A bus of mass 5,000kg and a car of mass 1200kg are both travelling on a dual carriage way at the same velocity. If both
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Date posted:
May 30, 2019
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Answers (1)
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The weight of cube in air is 0.25N. When immersed in water, it weighs 0.44N and when in oil weighs 0.46N. Calculate the relative density...
(Solved)
The weight of cube in air is 0.25N. When immersed in water, it weighs 0.44N and when in oil weighs 0.46N. Calculate the relative density of the oil.
Date posted:
May 30, 2019
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Answers (1)
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A block of glass of mass 0.25kg floats in mercury of density 1.36 × 104kg/m³. What volume of the glass lies under the surface of...
(Solved)
A block of glass of mass 0.25kg floats in mercury of density 1.36 × 104kg/m³. What volume of the glass lies under the surface of mercury?
Date posted:
May 30, 2019
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Answers (1)
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A rectangular block of cross-sectional area 0.08m² is immersed in a liquid of density 1200kg/m³. The top and the lower
surfaces are 80cm and 200cm below...
(Solved)
A rectangular block of cross-sectional area 0.08m² is immersed in a liquid of density 1200kg/m³. The top and the lower
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Date posted:
May 30, 2019
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Answers (1)
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A target of mass 1.05kg hangs from a tree by a long light string. An arrow of mass 100g is shot towards the target with...
(Solved)
A target of mass 1.05kg hangs from a tree by a long light string. An arrow of mass 100g is shot towards the target with a
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Determine:
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ii) the maximum height reached by the target after the impact.
Date posted:
May 30, 2019
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Answers (1)
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Water of mass 6kg initially at 25°C is heated in an electric kettle rated 6.0Kw. The water is heated until it boils at 100°C.
(Take specific...
(Solved)
Water of mass 6kg initially at 25°C is heated in an electric kettle rated 6.0Kw. The water is heated until it boils at 100°C.
(Take specific heat capacity of water 4200J/kg/k, heat capacity of the kettle 450J/k, specific latent heat of vaporisation
of water = 2.3 × 106 J/kg)
Determine
i) Heat absorbed by the water.
ii) Heat absorbed by the electric kettle.
iii) Time taken for the water to boil.
iv) How much longer it will take to boil away all the water?
Date posted:
May 30, 2019
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Answers (1)
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A plane is inclined against a wall as shown in the figure below.
Calculate the Velocity Ratio of the inclined plane.
(Solved)
A plane is inclined against a wall as shown in the figure below.
Calculate the Velocity Ratio of the inclined plane.
Date posted:
May 30, 2019
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Answers (1)
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Explain why it is necessary to add a little flour to the water when boiling it to cook ugali.
(Solved)
Explain why it is necessary to add a little flour to the water when boiling it to cook ugali.
Date posted:
May 30, 2019
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Answers (1)
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Explain why a glass of water cools more when ice at 0°C is added to it than when equal mass of water at 0°C is...
(Solved)
Explain why a glass of water cools more when ice at 0°C is added to it than when equal mass of water at 0°C is added to it.
Date posted:
May 30, 2019
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Answers (1)
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When graphite particles are suspended in water and observed through a microscope, they are seen to move in a random
motion. Explain.
(Solved)
When graphite particles are suspended in water and observed through a microscope, they are seen to move in a random
motion. Explain.
Date posted:
May 30, 2019
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Answers (1)
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A uniform rod of length 4m and mass of 4kg is pivoted at 3.6m mark. The rod is held horizontal with a vertical rope at...
(Solved)
A uniform rod of length 4m and mass of 4kg is pivoted at 3.6m mark. The rod is held horizontal with a vertical rope at the 4m
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Calculate the tension, T in the rope (Take g = 10N/kg)
Date posted:
May 30, 2019
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Answers (1)