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- In an experiment to determine the specific latent heat of vaporization of water, steam of mass 20g at 100°C is passed into 200g of water...(Solved)
In an experiment to determine the specific latent heat of vaporization of water, steam of mass 20g at 100⁰C is passed into 200g of water initially at 40⁰C in a container of negligible heat capacity. The temperature of the water rises to 80⁰C. (take the specific capacity of water 4200J/kg/k and the boiling water as 100⁰C)
i. Determine the specific latent heat of vaporization of water.
ii. What are the two errors in this experiment?
Date posted: November 2, 2017. Answers (1)
- Determine the pressure required to compress a gas in a cylinder initially at 40°C and a pressure of 1.03 x10^5pa to one-tenth of its original...(Solved)
Determine the pressure required to compress a gas in a cylinder initially at 40⁰C and a pressure of 1.03 x10^5pa to one-tenth of its original volume.
Date posted: November 2, 2017. Answers (1)
- Bubbles are seen to rise to the surface when the temperature of water reaches it boiling point. (i) What is contained in the bubbles?(Solved)
Bubbles are seen to rise to the surface when the temperature of water reaches it boiling point.
i. What is contained in the bubbles?
ii. Give a reason why the bubbles rise to the surface only at the boiling point
Date posted: November 2, 2017. Answers (1)
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State the four advantages and the two disadvantages of alkaline accumulators over the lead-acid accumulators and the two disadvantages.
Date posted: November 2, 2017. Answers (1)
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Describe a simple cell.
Date posted: November 2, 2017. Answers (1)
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Name two types of cells and briefly describe them.
Date posted: November 2, 2017. Answers (1)
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Apart from cells, battery and generators give other sources of electricity.
Date posted: November 2, 2017. Answers (1)
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Apart from metals, give other materials that can conduct electricity.
Date posted: November 2, 2017. Answers (1)
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In refrigerator, the cool-box is placed near the top. Give a reason for this.
Date posted: November 2, 2017. Answers (1)
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Give a reason why liquids generally expand more than solids.
Date posted: November 2, 2017. Answers (1)
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In deriving the equation of continuity, what three assumptions are made?
Date posted: November 2, 2017. Answers (1)
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Give a reason why most braking systems use liquids and not gases.
Date posted: November 2, 2017. Answers (1)
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A partially inflated balloon at sea level becomes fully inflated at higher altitudes. Explain this observation.
Date posted: November 2, 2017. Answers (1)
- Explain how a gas of constant volume exerts pressure on the walls of the container when temperature is increased.(Solved)
Explain how a gas of constant volume exerts pressure on the walls of the container when temperature is increased.
Date posted: November 2, 2017. Answers (1)
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Name the force that is responsible for the spread of water on a glass surface.
Date posted: November 2, 2017. Answers (1)
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Date posted: November 2, 2017. Answers (1)
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Explain why a high jumper flexes his knees when landing on the ground.
Date posted: November 2, 2017. Answers (1)
- Four cells have an e.m.f. of 1.5v each. What is the total e.m.f. when the cells are in parallel and which in series.(Solved)
Four cells have an e.m.f. of 1.5v each. What is the total e.m.f. when the cells are in parallel and which in series.
Date posted: November 1, 2017. Answers (1)
- Define the following terms (a) Closed circuit (b) Open circuit (c) Electromotive force (d) Lost volts(Solved)
Define the following terms
a. Closed circuit
b. Open circuit
c. Electromotive force
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Date posted: November 1, 2017. Answers (1)
- Calculate the amount of current flowing through a bulb if 500 coulombs of charge flow through it in 5 minutes.(Solved)
Calculate the amount of current flowing through a bulb if 500 coulombs of charge flow through it in 5 minutes.
Date posted: November 1, 2017. Answers (1)