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...

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.

---

---

Kavungya answered the question on May 21, 2019 at 06:36

Exams With Marking Schemes

• Grade 1
• Grade 2
• Grade 3
• Grade 4
• Grade 5
• Grade 6
• Grade 7
• Grade 8
• Grade 9
• PP1
• PP2
• Playgroup
• Form 1
• Form 2
• Form 3
• Form 4

Related Questions

---

• 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)

• 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)

• 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 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)

• 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)

• State two practical applications of stability (Solved)
  

  State two practical applications of stability

  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)

• Water falls through a height of 60 m at a rate of flow of 1.0x10^5 per minute. Calculate the amount of power generated at the base... (Solved)
  

  Water falls through a height of 60 m at a rate of flow of 1.0x10^5 per minute. Calculate the amount of power generated at the base of the water fall (the mass of 1 litre of water is 1 kg)
  

  Date posted: May 19, 2019 .    Answers (1)

• An aeroplane is moving horizontally through still air at a uniform speed. It is observed that when the speed of the plane is increased, its height above... (Solved)
  

  An aeroplane is moving horizontally through still air at a uniform
  speed. It is observed that when the speed of the plane is increased, its
  height above the ground increases. State the reason for this observation.

  Date posted: May 7, 2019 .    Answers (1)

• Describe an experiment that can be used to verify the Boyle’s law (Solved)
  

  Describe an experiment that can be used to verify the Boyle’s law

  Date posted: April 24, 2019 .    Answers (1)

• Describe an experiment that can be used to demonstrate Effects of reduced pressure on boiling point. (Solved)
  

  Describe an experiment that can be used to demonstrate Effects of reduced pressure on boiling point.

  Date posted: April 24, 2019 .    Answers (1)