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The molecules in oil patch are closely packed. The oil drop b a perfect sphere/the oil patch perfect circular.
Kavungya answered the question on May 21, 2019 at 06:38
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- The figure below shows three capacitors connected between two points A and B.
Determine the capacitance across AB(Solved)
The figure below shows three capacitors connected between two points A and B.
Determine the capacitance across AB
Date posted: May 20, 2019. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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)