Latent heat of vaporization is a physical property of a substance. It is defined as the heat required to change one mole of liquid at its boiling point under standard atmospheric pressure.
Kavungya answered the question on November 16, 2022 at 13:28
- The graph provided is of force (y-axis) against extension.
(i) From the graph determine the work done in stretching spring by 3cm
(ii) Use the graph to...(Solved)
The graph provided is of force (y-axis) against extension.
(i) From the graph determine the work done in stretching spring by 3cm
(ii) Use the graph to determine the spring constant. Give your answer in SI units
(iii) State three factors that affect the spring constant
Date posted: November 16, 2022. Answers (1)
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The figure below shows a cross-section of a handle of a screw jack 70 cm long. The pitch of the screw is 0.8 cm
Given that the efficiency is 65%, calculate:
i) the velocity ratio of the system
ii) the mechanical advantage of the screw jack.
iii.) Sketch a graph of efficiency against Load
iv.) Draw a single moving pulley with a velocity ratio of 2.
Date posted: November 16, 2022. Answers (1)
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A force of 7.5N stretches a certain spring by 5 cm. Calculate the work done in stretching this spring by 8.0 cm.
Date posted: November 16, 2022. Answers (1)
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Explain why a lift pump is unable to raise water from a borehole where the level of water is 20m below the ground level.
Date posted: November 16, 2022. Answers (1)
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Using the idea of particles, explain why the pressure inside the tyre is increased when it is pumped up.
Date posted: November 16, 2022. Answers (1)
- The figure below shows three identical springs which obey Hooke’s law.
Determine the length Xcm.(Solved)
The figure below shows three identical springs which obey Hooke’s law.
Determine the length Xcm.
Date posted: November 16, 2022. Answers (1)
- The figure below shows air flowing through a pipe of non-uniform cross-sectional area. Two pipes A and B are dipped into liquids as shown.(Solved)
The figure below shows air flowing through a pipe of non-uniform cross-sectional area. Two pipes A and B are dipped into liquids as shown.
a) Indicate the levels of the liquids in Pipe A and pipe B.
b) Explain your answer in 7 (a) above.
Date posted: November 16, 2022. Answers (1)
- The figure below shows a clinical thermometer which is not graduated.
a) Name the parts indicate with letters: A and B
b) Mark the appropriate scale range...(Solved)
The figure below shows a clinical thermometer which is not graduated.
a) Name the parts indicate with letters: A and B
b) Mark the appropriate scale range in degrees Celsius
Date posted: November 16, 2022. Answers (1)
- The figure below shows a funnel dipped into a liquid soap solution.
Explain what happens to the soap bubble when the funnel is removed.(Solved)
The figure below shows a funnel dipped into a liquid soap solution.
Explain what happens to the soap bubble when the funnel is removed.
Date posted: November 16, 2022. Answers (1)
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What is surface tension?
Date posted: November 16, 2022. Answers (1)
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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 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. Answers (1)
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Define pressure and state its SI unit
Date posted: March 16, 2022. 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 0.12cm3, what is the final water level in the burette?
Date posted: March 15, 2022. Answers (1)
- 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. Answers (1)
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Date posted: March 15, 2022. Answers (1)
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Date posted: March 15, 2022. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
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The questions asks one to explain the electromotive force in electricity.
Date posted: June 5, 2020. Answers (1)
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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. Answers (1)