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A steel sphere released in a tall transparent water jar attains a constant velocity after a while. The same sphere released in air falls at...
(Solved)
A steel sphere released in a tall transparent water jar attains a constant velocity after a while. The same sphere released in air falls at a constant acceleration. Explain with a reason the difference in its motion in water and in air
Date posted:
September 27, 2019
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Answers (1)
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The figure below shows the features of a Geiger-Muller (G.M) Tube used for detecting radiation.
(Solved)
The figure below shows the features of a Geiger-Muller (G.M) Tube used for detecting radiation.
(i) State the use of Argon gas and Bromine.
Argon gas
Bromine
(ii) Explain how radiation from the source is detected by the tube.
(iii) State one use of radio activity in medicine.
Date posted:
September 27, 2019
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Answers (1)
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A block of mass 200g is placed on a frictionless rotating table while fixed to the centre of the table by a thin thread. The...
(Solved)
A block of mass 200g is placed on a frictionless rotating table while fixed to the centre of the table by a thin thread. The distance from the centre of the table to the block is 15cm. If the maximum tension the thread can withstand is 5.6N, determine the maximum angular velocity the table can attain before the thread cuts.
Date posted:
September 27, 2019
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Answers (1)
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The figure below shows a metal rod AB of length 2m horizontally balanced while supported by a pivot and a string.
(Solved)
The figure below shows a metal rod AB of length 2m horizontally balanced while supported by a pivot and a string.
Determine the mass of the metal rod if the tension is 15N.
Date posted:
September 27, 2019
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Answers (1)
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A block of wood of mass 80kg floats in water with 0.6 of its volume in water. Calculate the number of rods each 20g that...
(Solved)
A block of wood of mass 80kg floats in water with 0.6 of its volume in water. Calculate the number of rods each 20g that can be placed on the block so that its top is level with the surface of water.
Date posted:
September 27, 2019
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Answers (1)
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The figure below shows four equivalent springs with negligible weight, the weight of the rod R is 20N. Given that the spring constant is 5N/m....
(Solved)
The figure below shows four equivalent springs with negligible weight, the weight of the rod R is 20N. Given that the spring constant is 5N/m. Calculate the load L which causes an extension of 28m to the system.
Date posted:
September 27, 2019
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Answers (1)
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State any two possible ways of increasing velocity ratio of wheel and axle.
(Solved)
State any two possible ways of increasing velocity ratio of wheel and axle.
Date posted:
September 27, 2019
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Answers (1)
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What does it mean to say the density of water is 1g/cm3?
(Solved)
What does it mean to say the density of water is 1g/cm3?
Date posted:
September 27, 2019
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Answers (1)
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The diagram below shows two similar cups of tea containing equal volumes of hot tea at the same level. It was observed that the rate...
(Solved)
The diagram below shows two similar cups of tea containing equal volumes of hot tea at the same level. It was observed that the rate of cooling was the same in the two cups. Explain.
Date posted:
September 27, 2019
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Answers (1)
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A body is acted upon by a force of 10N towards the right hand side and 6N towards the left hand side. What is the...
(Solved)
A body is acted upon by a force of 10N towards the right hand side and 6N towards the left hand side. What is the resultant force?
Date posted:
September 27, 2019
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Answers (1)
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The figure below shows a rectangular block of wood with a hollow section at the position shown. The block is resting on a...
(Solved)
The figure below shows a rectangular block of wood with a hollow section at the position shown. The block is resting on a horizontal bench.
State and explain the effects on stability of the block when the hollow section is filled with water.
Date posted:
September 27, 2019
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Answers (1)
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The figure below shows two identical balloons A and B the balloons were filled with equal amounts of same type of gas. The balloons are...
(Solved)
The figure below shows two identical balloons A and B the balloons were filled with equal amounts of same type of gas. The balloons are suspected at distance X1 and X2 from a metal cube filled with boiling water and placed on an insulating material.
a. State the mode by which heat travels from the cubes to the balloons.
b. The face of the cube towards A is bright and shiny and face towards B is dull black. State with reasons the adjustments that should be made on the distances XI and X2 so that the rate of change of temperature in both balloons remains the same
Date posted:
September 27, 2019
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Answers (1)
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A nail is electrically magnetized, it attracts an increasing number of pins as the magnetizing current increase. After some time it can no longer attract...
(Solved)
A nail is electrically magnetized, it attracts an increasing number of pins as the magnetizing current increase. After some time it can no longer attract any more pins. Explain this observation domain theory.
Date posted:
September 27, 2019
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Answers (1)
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A dry cell is not recharged once used up. However when used well, it can serve one for some time. State the precautions necessary when...
(Solved)
A dry cell is not recharged once used up. However when used well, it can serve one for some time. State the precautions necessary when using it other than storing it in dry condition.
Date posted:
September 27, 2019
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Answers (1)
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The figure below shows a pulley system for lifting heavy objects.
(Solved)
The figure below shows a pulley system for lifting heavy objects.
(i) State the velocity ratio of the pulley system.
(ii) If the efficiency of the machine is 75%, calculate the mechanical advantage of the system.
(iii) Determine the effort applied
Date posted:
September 27, 2019
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Answers (1)
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A block measuring 20cm by 10cm by 4 cm rests on a flat surface. The block has a weight of 6.0N. Determine:
(Solved)
A block measuring 20cm by 10cm by 4 cm rests on a flat surface. The block has a weight of 6.0N. Determine:
(a) The minimum pressure it exerts on the surface.
(b) The density of the block in kg/m3. Take (g = 1N/kg)
Date posted:
September 26, 2019
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Answers (1)
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A solid displaces 5.0cm3 of paraffin when floating and 20cm3 when fully immersed in it. Given that the density of paraffin is 0.8g/cm3 ....
(Solved)
A solid displaces 5.0cm3 of paraffin when floating and 20cm3 when fully immersed in it. Given that the density of paraffin is 0.8g/cm3 . Calculate the density of the solid
Date posted:
September 26, 2019
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Answers (1)
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A jet of water emerges from a hose pipe of cross-sectional area 5.0 x 10-3m2 with a velocity of 3.0m/s. The water strikes a wall...
(Solved)
A jet of water emerges from a hose pipe of cross-sectional area 5.0 x 10-3m2 with a velocity of 3.0m/s. The water strikes a wall at a right angle and comes to rest without rebounding. Determine the mass of water striking the wall per second (Density of water is 1000 kgm-3)
Date posted:
September 26, 2019
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Answers (1)
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The diagram below shows two horizontal pipes, A and B. Tube A contains liquid at rest while tube B contains liquid in motion.
(Solved)
The diagram below shows two horizontal pipes, A and B. Tube A contains liquid at rest while tube B contains liquid in motion
Sketch graphs for (a) and (b) to show variation in pressure
Date posted:
September 26, 2019
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Answers (1)
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In using the lift pump to raise water from a bore hole. It is observed that practically the height the water is raised cannot be...
(Solved)
In using the lift pump to raise water from a bore hole. It is observed that practically the height the water is raised cannot be 10m and more. Give two reasons for this observation.
Date posted:
September 26, 2019
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Answers (1)