Surface tension is the force per unit length acting on the surface of a liquid and perpendicular to one side of an imaginary line drawn in the surface.
?Surface tension is the tangential force acting at right angles in the surface of a liquid per
unit length across any line in the surface
? (It is the property that makes a free liquid surface act like a stretched elastic skin).
Kavungya answered the question on November 16, 2022 at 11:25
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A trolley of mass 1.5kg moving with a velocity of 1.2ms-1 collides inelastically with a second trolley of mass 0.5kg moving in the opposite direction...
(Solved)
A trolley of mass 1.5kg moving with a velocity of 1.2ms-1 collides inelastically with a second trolley of mass 0.5kg moving in the opposite direction with a velocity of 0.2ms -1 .
(a) What is an inelastic collision?
(b) Determine the velocity of the trolleys after collision.
Date posted:
November 16, 2022
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Answers (1)
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Define pressure and state its SI unit
(Solved)
Define pressure and state its SI unit
Date posted:
March 16, 2022
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Answers (1)
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The water level in a burette is 30cm3. If 55 drops of water fall from the burette and the average volume of one drop is...
(Solved)
The water level in a burette is 30cm3. If 55 drops of water fall from the burette and the average volume of one drop is 0.12cm3, what is the final water level in the burette?
Date posted:
March 15, 2022
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Answers (1)
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Name the instruments you would use to measure each of the following:
(a) The length of a football field
(b) The height of a 20 litre jerrican...
(Solved)
Name the instruments you would use to measure each of the following:
(a) The length of a football field
(b) The height of a 20 litre jerrican
(c) The circumference of your waist
Date posted:
March 15, 2022
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Answers (1)
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A body is acted upon by three forces as shown below
(Solved)
A body is acted upon by three forces as shown below
Date posted:
March 15, 2022
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Answers (1)
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Giving an example, define the term derived quantities
(Solved)
Giving an example, define the term derived quantities
Date posted:
March 15, 2022
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Answers (1)
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The figure below shows the volume of water in a measuring cylinder before and after immersing a stone. If the mass of the stone is...
(Solved)
The figure below shows the volume of water in a measuring cylinder before and after immersing a stone. If the mass of the stone is 125g, determine its density
Date posted:
March 15, 2022
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Answers (1)
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How can you verify the principle of moments when you are provided with the following: (i)Several masses of 50grams and 100grams. (ii)Strings to tie the masses. (iii)A metre rule. (iv)Wooden wedge.
(Solved)
How can you verify the principle of moments when you are provided with the following:
(i)Several masses of 50grams and 100grams.
(ii)Strings to tie the masses.
(iii)A metre rule.
(iv)Wooden wedge.
Date posted:
December 11, 2020
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Answers (1)
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Discuss the electromotive force
(Solved)
The questions asks one to explain the electromotive force in electricity.
Date posted:
June 5, 2020
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Answers (1)
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Why are dam walls constructed thicker at the bottom than at the top?
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The question requires a learner to understand the effect of the liquid column on pressure exerted on the bottom.The greater the height the the greater the pressure.
Date posted:
April 3, 2020
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Answers (1)
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Light of frequency 6.5x1014Hz is radiated on a metal whose threshold frequency is 2.0 x1014 Hz.Determine the kinetic energy of the emitted electrons.
(Planck’s constant...
(Solved)
Light of frequency 6.5x1014Hz is radiated on a metal whose threshold frequency is 2.0 x1014 Hz.Determine the kinetic energy of the emitted electrons.
(Planck’s constant =6.63x10-34 Js. )
Date posted:
November 22, 2019
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Answers (1)
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In Figure below, complete the diagrams to show the path of the X-ray beam when it enters an electric field.
(Solved)
In Figure below, complete the diagrams to show the path of the X-ray beam when it enters an electric field.
Date posted:
November 22, 2019
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Answers (1)
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The figure below shows a current carrying conductor placed between two strong magnets.
(Solved)
The figure below shows a current carrying conductor placed between two strong magnets.
Indicate the direction of the magnetic field and the force on the conductor
Date posted:
November 22, 2019
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Answers (1)
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The chart below shows an arrangement of different parts of the electromagnetic spectrum.
(Solved)
The chart below shows an arrangement of different parts of the electromagnetic spectrum.
Name the radiation represented by letter Q and state one use of the radiation.
Date posted:
November 22, 2019
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Answers (1)
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Calculate the magnification produced by a convex lens of focal length 10cm used in a simple microscope given that the image distance is 40cm.
(Solved)
Calculate the magnification produced by a convex lens of focal length 10cm used in a simple microscope given that the image distance is 40cm.
Date posted:
November 22, 2019
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Answers (1)
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The figure shows objects A and B placed in front of a mirror M.
(Solved)
The figure shows objects A and B placed in front of a mirror M.
Show the position of their images A1 and B1.
Date posted:
November 22, 2019
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Answers (1)
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The graph shows the relationship between the pressure and temperature for a fixed mass of an ideal gas at constant volume.
(Solved)
The graph shows the relationship between the pressure and temperature for a fixed mass of an ideal gas at constant volume.
i) Given that the relationship between pressure, P and temperature, T in Kelvin is of the form P = kT + C where k and C are constants. Determine from the graph,
I. Value of k
II. Value of C
Date posted:
November 22, 2019
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Answers (1)
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The figure below shows a pulley system being used to raise a load.
(Solved)
The figure below shows a pulley system being used to raise a load.
This pulley system has an efficiency of 75%.
(i) Determine the velocity ratio of the system.
(ii) Determine the mechanical advantage of the pulley system.
(iii) Determine the effort required to raise a load of 240kg.
(iv) Determine the work done by a person using this machine in raising a load of 120kg through a vertical distance of 2.5m
Date posted:
November 22, 2019
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Answers (1)
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The figure below shows a plastic egg supported vertically by a stream of air from a pump.
(Solved)
The figure below shows a plastic egg supported vertically by a stream of air from a pump.
Explain why the egg will not move away from the midstream position.
Date posted:
November 22, 2019
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Answers (1)
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Three identical springs each of weight 1.5N are arranged to support a 50N load as shown in the figure below:
(Solved)
Three identical springs each of weight 1.5N are arranged to support a 50N load as shown in the figure below:
a) Given that one such a spring extends by 2 cm when a load of 20N hangs on its lower end, determine its spring constant.
b) If the glass rod weighs 0.5N, determine the total extension of the system of springs.
Date posted:
November 22, 2019
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Answers (1)