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Difference in the cohesive and adhesive forces of mercury and glass molecules.
sharon kalunda answered the question on April 2, 2019 at 12:10
- A bathroom shower has 200 holes each 2.5mm2 in area. Water flows from a pipe of cross-section
area of 15cm at 5m/s to the shower. Determine...(Solved)
A bathroom shower has 200 holes each 2.5mm2 in area. Water flows from a pipe of cross-section
area of 15cm at 5m/s to the shower. Determine the speed of the spray.
Date posted: April 2, 2019. Answers (1)
- A piece of metal N of mass 2kg weighs 18N in water and 12N in liquid M. Determine the density of ;(Solved)
A piece of metal N of mass 2kg weighs 18N in water and 12N in liquid M. Determine the density of ;
(i) The metal N
(ii) The liquid M
Date posted: April 2, 2019. Answers (1)
- A measuring cylinder contains 50cm3 of light oil at 0oC. When a lump of dried ice is placed in the oil, the total volume is...(Solved)
A measuring cylinder contains 50cm3 of light oil at 0oC. When a lump of dried ice is placed in the oil, the total volume is 72cm3. Determine the density of the ice.
Date posted: April 2, 2019. Answers (1)
- The figure below shows a balloon carrying hydrogen gas 3m3 of density 0.09kgm-3. The mass of the balloon fabric is 2kg and the density of...(Solved)
The figure below shows a balloon carrying hydrogen gas 3m3 of density 0.09kgm-3. The mass of the balloon fabric is 2kg and the density of air is 1.25kgm-3
i) Determine the tension in the string
ii) If the string is suddenly cut, calculate the acceleration of the balloon upwards
iii) What is the maximum mass of the equipment the balloon can lift at a constant velocity
Date posted: April 2, 2019. Answers (1)
- A block of mass 5kg rests on an inclined surface as shown in the diagram below:(Solved)
A block of mass 5kg rests on an inclined surface as shown in the diagram below:
Determine the static friction on the block
Date posted: April 2, 2019. Answers (1)
- Give an example where force is applied and no work is done(Solved)
Give an example where force is applied and no work is done
Date posted: April 2, 2019. Answers (1)
- The graph below shows the variation between force and distance for a boy pushing a concrete block of mass 25kg through a vertically height of...(Solved)
The graph below shows the variation between force and distance for a boy pushing a concrete block of mass 25kg through a vertically height of 12m.
(i) Determine the total work done by the boy within 70m
(ii) How much energy is wasted?
(iii) Give an account for the energy wasted
Date posted: April 2, 2019. Answers (1)
- Figure below shows a wire loop with a string that has been dipped into soap solution.(Solved)
Figure below shows a wire loop with a string that has been dipped into soap solution.
i) Sketch a similar diagram to show the observed effect if the soap film is punctured at X
ii) Explain the observations made in (i) above
Date posted: April 2, 2019. Answers (1)
- The diagram figure below shows a steel ball bearing gently dipped in a viscous liquid contained in a tall cylinder.(Solved)
The diagram figure below shows a steel ball bearing gently dipped in a viscous liquid contained in a tall cylinder.
Name giving their directions the forces acting on the ball bearing as it moves down the cylinder.
Date posted: April 2, 2019. Answers (1)
- State the condition necessary for the law of conservation of linear momentum to hold.(Solved)
State the condition necessary for the law of conservation of linear momentum to hold.
Date posted: April 2, 2019. Answers (1)
- Mercury on a clean glass slide collects into small spherical balls as shown in figure below.
Explain why(Solved)
Mercury on a clean glass slide collects into small spherical balls as shown in figure below.Explain why
Date posted: April 2, 2019. Answers (1)
- The figure below shows two blocks of masses M1=1.5kg and M2 = 2.0kg which are in contact on a frictionless table(Solved)
The figure below shows two blocks of masses M1=1.5kg and M2 = 2.0kg which are in contact on a frictionless table
A force F=7N acts on the bodies, determine the force on mass M2
Date posted: April 2, 2019. Answers (1)
- Give one difference between limiting and dynamic forces of friction(Solved)
Give one difference between limiting and dynamic forces of friction
Date posted: April 2, 2019. Answers (1)
- Explain why it is easier to ride a bicycle round a bend on a road if the surface is dry than when it is wet(Solved)
Explain why it is easier to ride a bicycle round a bend on a road if the surface is dry than
when it is wet
Date posted: April 2, 2019. Answers (1)
- The figure below shows a block of mass 25g and density 200kg/m3 submerged beam by means of a thread. A mass of 2g if suspended...(Solved)
The figure below shows a block of mass 25g and density 200kg/m3 submerged beam by means of a thread. A mass of 2g if suspended form the beam as shown in the figure below.
(i) Determine the up thrust force acting on the block.
(ii) Calculate the density of the liquid.
Date posted: April 2, 2019. Answers (1)
- A bubble of air has a diameter of 2.0 mm when it is 0.5m below the water surface of a boiler.
Calculate the diameter of the...(Solved)
A bubble of air has a diameter of 2.0 mm when it is 0.5m below the water surface of a boiler.
Calculate the diameter of the bubble as it reaches the surface, assuming that the temperature
remains constant.(Take g = 10Nkg-1 density of water = 103kgm-3 and atmospheric pressure = 105Mn-2
Date posted: April 2, 2019. Answers (1)
- A crane lifts a load 500kg through a vertical distance of 4m in 8 seconds. Determine:(Solved)
A crane lifts a load 500kg through a vertical distance of 4m in 8 seconds. Determine:
(i) Work done by the crane
(ii) Power developed by the crane
(iii) Efficiency of the crane given that it is operated by an electric motor rated 2.8Kw
Date posted: April 2, 2019. Answers (1)
- Define work and state its S.I units(Solved)
Define work and state its S.I units
Date posted: April 2, 2019. Answers (1)
- A man uses a block and tackle mechanism of velocity ratio 6 to lift a car engine smoothly through a height of 1 m in...(Solved)
A man uses a block and tackle mechanism of velocity ratio 6 to lift a car engine smoothly through a height of 1 m in 5s. The man applies a force of 300N while the mass of the engine is 120 kg. Determine:
(i) The mechanical advantage of the pulley system.
(ii) its efficiency.
Date posted: April 2, 2019. Answers (1)
- A bicycle has wheels 66 cm in diameter. Its crank wheel has 44 teeth and the rear sprocket 16 teeth. The crank radius is 16.5...(Solved)
A bicycle has wheels 66 cm in diameter. Its crank wheel has 44 teeth and the rear sprocket 16 teeth. The crank radius is 16.5 cm.
(i) Determine the radius of the rear sprocket.
(ii) The bicycle moves when the rear sprocket is made to move. Hence determine the
velocity ratio.
Date posted: April 2, 2019. Answers (1)