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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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- The figure below shows a turntableon which a mass of 50g is placed 10cm from the centre.
Frictional force between the 50g mass and the turntable...(Solved)
The figure below shows a turntableon which a mass of 50g is placed 10cm from the centre.
Frictional force between the 50g mass and the turntable is 0.4 N.When the turntable is made to rotate with angular velocity of W rad/sec, the mass starts to slide off.
Determine the:
I. Angular velocity W
II. Time taken to make one complete revolution
iii) On the figure, draw a path that would be taken by the 50g mass if the turntable suddenly came to stop
Date posted: May 20, 2019. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- An object moving at 30 m/s starts to accelerate at 5m/s2 so that its velocity becomes 50 m/s.
i) Find the distance moved during this acceleration
ii)...(Solved)
An object moving at 30 m/s starts to accelerate at 5m/s2 so that its velocity becomes 50 m/s.
i) Find the distance moved during this acceleration
ii) The object is now braked so that it comes to rest in a time of 5 seconds. Find the braking force if its mass was 2700g.
Date posted: May 20, 2019. Answers (1)
- 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. Answers (1)
- On the axis provided sketch a graph of mechanical advantage (MA) against load for a pulley
system(Solved)
On the axis provided sketch a graph of mechanical advantage (MA) against load for a pulley
system
Date posted: May 20, 2019. Answers (1)
- Water flows steadily along a horizontal pipe at a volume rate of 8.0×10-3m3/s.If the cross-section area of the pipe is 20cm2. Calculate the velocity of...(Solved)
Water flows steadily along a horizontal pipe at a volume rate of 8.0×10-3m3/s.If the cross-section area of the pipe is 20cm2. Calculate the velocity of the fluid.
Date posted: May 20, 2019. Answers (1)
- Explain how loose clothing may affect safety in the laboratory(Solved)
Explain how loose clothing may affect safety in the laboratory
Date posted: May 20, 2019. Answers (1)
- State two practical applications of stability(Solved)
State two practical applications of stability
Date posted: May 20, 2019. Answers (1)
- The figure below shows a uniform meter rule balanced at the 20 cm mark when a mass of 50g is hanging from its zero cm...(Solved)
The figure below shows a uniform meter rule balanced at the 20 cm mark when a mass of 50g is hanging from its zero cm mark
Calculate the weight of the rule
Date posted: May 20, 2019. Answers (1)
- The figure below shows a section of a solar heater
Explain;
i) Why the pipeline is fixed to a dark coloured collector plate
ii) Why is pipe coloured...(Solved)
The figure below shows a section of a solar heater
Explain;
i) Why the pipeline is fixed to a dark coloured collector plate
ii) Why is pipe coloured several times
iii) Why is pipe made of copper
iv) Why is the collector plate fixed to an insulator?
v) Why the panel front covered with glass
Date posted: May 20, 2019. Answers (1)
- How does the volume of a given mass of water change as;
i) The water is cooled from 100 C to 00C?
ii) The water is...(Solved)
How does the volume of a given mass of water change as;
i) The water is cooled from 100 C to 00C?
ii) The water is frozen to ice at 00C?
Date posted: May 20, 2019. Answers (1)
- A car weighs 12 000N.
i. What is the force acting on one tyre if the weight is evenly distributed amongst
the tyres?
ii. If the area...(Solved)
A car weighs 12 000N.
i. What is the force acting on one tyre if the weight is evenly distributed amongst
the tyres?
ii. If the area of contact of tyre is 80cm2.Calculate the pressure of the air in the tyre.
Date posted: May 20, 2019. Answers (1)
- You are provided with a test – tube, thread and a meter ruler. Outline the steps you would use to measure the circumference and hence...(Solved)
You are provided with a test – tube, thread and a meter ruler. Outline the steps you would use to measure the circumference and hence the diameter of the test – tube.
Date posted: May 20, 2019. Answers (1)
- The figure below shows a rubber sucker, explain why the sucker sticks on a clean flat
Surface.(Solved)
The figure below shows a rubber sucker, explain why the sucker sticks on a clean flat
Surface.
Date posted: May 20, 2019. Answers (1)
- A micrometer screw gauge has a zero error of -0.03mm. It is used to measure the diameter of a wire. If the actual diameter of...(Solved)
A micrometer screw gauge has a zero error of -0.03mm. It is used to measure the diameter of a wire. If the actual diameter of the wire is 0.30mm, draw the micrometer screw gauge showing the measured diameter of the wire.
Date posted: May 20, 2019. Answers (1)