The figure below shows a buoy of capacity 40 litres and mass 10kg. It is held in position in sea water of density 1.04g/cm³ by a...

The figure below shows a buoy of capacity 40 litres and mass 10kg. It is held in position in sea water of
density 1.04g/cm³ by a light cable fixed to the bottom so that ¾ of its volume is below the water surface.

Determine the tension in the cable.

---

---

sharon kalunda answered the question on September 6, 2019 at 07:24

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 figure below shows a block with a graduated side and dimensions 4cm by 16cm, just about to be lowered into a liquid in an overflow... (Solved)
  

  The figure below shows a block with a graduated side and dimensions 4cm by 16cm, just about to be lowered
  into a liquid in an overflow can.
  
  During an experiment with this set-up, the following was recorded:
  - The block floated with three-quarter of it submerged.
  - Initial reading of balance = 0g
  - Final reading of balance = 154g
  Use the information to determine the density of
  (i) the block
  (ii) the liquid

  Date posted: September 6, 2019 .    Answers (1)

• A bicycle wheel makes 300 revolutions per minute. Calculate the angular velocity of the wheel. (Solved)
  

  A bicycle wheel makes 300 revolutions per minute. Calculate the angular velocity of the wheel.

  Date posted: September 6, 2019 .    Answers (1)

• The figure below shows two masses 0.1kg and 2kg connected by a string through a hole on a smooth horizontal surface.The 0.1kg rotates in a... (Solved)
  

  The figure below shows two masses 0.1kg and 2kg connected by a string through a hole on a smooth horizontal surface.
  
  The 0.1kg rotates in a horizontal circle of radius 3cm. Calculate the angular velocity of the 0.1kg mass, when the system is in equilibrium.

  Date posted: September 6, 2019 .    Answers (1)

• Three insoluble powders A, B and C of densities dA, dB and dC, such that dA>dB>dC, are mixed and put into a container.The container is... (Solved)
  

  Three insoluble powders A, B and C of densities dA, dB and dC, such that dA>dB>dC, are mixed and put into a container.The container is then whirled in a horizontal circle as shown in the figure below.
  
  (i) Label on the figure, the positions of the powders after some time.
  (ii) Give a reason for your answer in (i)

  Date posted: September 6, 2019 .    Answers (1)

• A car decelerates uniformly from a velocity of 20m/s to rest in 4 seconds. It takes 4 seconds to reverse with uniform acceleration to its... (Solved)
  

  A car decelerates uniformly from a velocity of 20m/s to rest in 4 seconds. It takes 4 seconds to reverse with uniform acceleration to its original starting point.
  (i) Sketch a velocity time graph for the motion of the car.
  (ii) Use your sketch in c (i) to determine the total displacement of the car.

  Date posted: September 6, 2019 .    Answers (1)

• The figure below shows the displacement – time graph of the motion of a particle. State the nature of the motion of the particle between? (i)... (Solved)
  

  The figure below shows the displacement – time graph of the motion of a particle.
  
  State the nature of the motion of the particle between?
  (i) AB
  (ii) BC
  (iii CD

  Date posted: September 6, 2019 .    Answers (1)

• State the physical quantity represented by the gradient of a displacement – time graph (Solved)
  

  State the physical quantity represented by the gradient of a displacement – time graph

  Date posted: September 6, 2019 .    Answers (1)

• A substance of mass 2kg and specific heat capacity 400J/kg/k initially at 80⁰C is immersed in water at 19⁰C. If the final temperature of the... (Solved)
  

  A substance of mass 2kg and specific heat capacity 400J/kg/k initially at 80⁰C is immersed in water at 19⁰C. If the final temperature of the mixture is 20⁰C. Calculate the mass of water. (Specific heat capacity of water = 4200J/kg/k)

  Date posted: September 6, 2019 .    Answers (1)

• A force of 20N is used to stretch a spring through 5cm. Calculate the elastic potential energy stored in the spring. (Solved)
  

  A force of 20N is used to stretch a spring through 5cm. Calculate the elastic potential energy stored in the spring.

  Date posted: September 6, 2019 .    Answers (1)

• A pipe of radius 3mm is connected to another pipe of radius 9mm. If water flows in the water pipe at a speed of 2m/s,... (Solved)
  

  A pipe of radius 3mm is connected to another pipe of radius 9mm. If water flows in the water pipe at a speed of 2m/s, what is the speed in the narrower pipe?

  Date posted: September 6, 2019 .    Answers (1)

• A uniform 120m metal rod is pivoted near one of its ends and kept in equilibrium by a spring balance as shown in the figure... (Solved)
  

  A uniform 120m metal rod is pivoted near one of its ends and kept in equilibrium by a spring balance as shown in the figure below.
  
  The reading indicated by the spring balance is 2.0N. Work out the mass of the metal rod. (g = 10N/kg)

  Date posted: September 6, 2019 .    Answers (1)

• The spiral springs shown in the figure below are identical. Each spring has a constant K = 300N/m. Determine the extension caused by the 150N weight... (Solved)
  

  The spiral springs shown in the figure below are identical. Each spring has a constant K = 300N/m.
  
  Determine the extension caused by the 150N weight (Ignore weight of springs and connecting rods)

  Date posted: September 6, 2019 .    Answers (1)

• A micrometer screw gauge has a zero error of -0.02mm. 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 -0.02mm. It is used to measure the diameter of a wire. If the actual diameter of the wire is 0.28mm. Draw the micrometer screw gauge showing the diameter of the wire.

  Date posted: September 6, 2019 .    Answers (1)

• A girl performed an experiment to measure the focal length of a converging mirror.In the experiment, a series of object distance,U(cm) and image distance V(cm)... (Solved)
  

  A girl performed an experiment to measure the focal length of a converging mirror.In the experiment, a series of object distance,U(cm) and image distance V(cm) were obtained and the graph UV cm² against V+U obtained as shown below.
  
  
  
  Use the graph to determine:
  
  i) Focal length of the mirror.
  
  ii) Radius of curvature.
  
  iii) State two applications of diverging mirror.
  
  iv) Explain how a concave mirror is used by a dentist to enlarge image of the tooth.

  Date posted: August 22, 2019 .    Answers (1)

• The figure below shows a standing wave formed when a string of length 1.5 m stretched between two supports is plucked in the middle. (Solved)
  

  The figure below shows a standing wave formed when a string of length 1.5 m stretched between two supports is plucked in the middle.
  
  
  
  (i) Explain how the standing wave is formed
  
  (ii) Determine the wavelength of the standing wave

  Date posted: August 22, 2019 .    Answers (1)

• The figure below shows crests of circular water waves spreading from two points A and B due to a vibrator. C and D are points... (Solved)
  

  The figure below shows crests of circular water waves spreading from two points A and B due to a vibrator. C and D are points on the surface of the water.
  
  
  
  Given that the amplitude of each wave is 5 cm, state with a reason the amplitudes of the waves at point:
  
  (i) C
  
  (ii) D

  Date posted: August 22, 2019 .    Answers (1)

• Sodium has a work function of 2.3eV. Given that: Planck’s constant h = 6.63 x 10^-34JS, velocity of light in vacuum, C = 3.0 x10⁸m/s,... (Solved)
  

  Sodium has a work function of 2.3eV. Given that: Planck’s constant h = 6.63 x 10^-34JS, velocity of light in vacuum, C = 3.0 x10⁸m/s, 1 electron-volt (1eV) = 1.6 x 10^-19 C and mass of an electron, me = 9.1 x 10^-31kg, calculate:
  
  (i) Its threshold frequency.
  
  
  (ii) The maximum velocity of the photoelectrons produced when the sodium is illuminated by light of wavelength 5.0 x 10^-7m.
  
  (iii) The stopping potential V, with the light of this wavelength.

  Date posted: August 22, 2019 .    Answers (1)

• A G.M tube indicated a constant count rate of 5 counts per minute when a radioactive source was placed at a distance of about 10... (Solved)
  

  A G.M tube indicated a constant count rate of 5 counts per minute when a radioactive source was placed at a distance of about 10 cm from it. When the source was moved close to about 4cm the count rate varied as follows.
  
  
  
  (i) The count rate was constant at a distance of 10 cm away. Explain
  
  (ii) Plot a graph of count rate against time.
  
  (iii) Use your graph to estimate the half-life of the radioactive source.
  
  (iv)
  
  (v) State two precautions that have to be observed when using a radioactive substance.
  
  (vi) Distinguish between fission and fusion.

  Date posted: August 22, 2019 .    Answers (1)

• The figure below shows a circuit. (Solved)
  

  The figure below shows a circuit.
  
  
  
  
  Calculate:
  
  i) The total resistance of the circuit.
  
  ii) The total current flowing in the circuit.
  
  iii) The voltage drop across resistor R1.
  
  iv) The current through the 3Ω resistor.

  Date posted: August 22, 2019 .    Answers (1)

• The figure below shows a current carrying wire at right angle to a cardboard. Iron fillings are sprinkled on the card and card slightly tapped. (Solved)
  

  The figure below shows a current carrying wire at right angle to a cardboard. Iron fillings are sprinkled on the card and card slightly tapped.
  
  
  
  
  Draw and indicate the direction of the magnetic field pattern displayed on the card.

  Date posted: August 22, 2019 .    Answers (1)