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-Cooling the ball increases the volume by expansion.
-Density is a quotient of mass and volume.
-If the volume increases while mass remains the same, the density of the ball reduces automatically.
Githiari answered the question on September 16, 2017 at 08:37
- A pipe of diameter 8.4cm is connected to another pipe of diameter 3.5cm. The speed of the water in
the bigger pipe is 1.8m/s. Find...(Solved)
A pipe of diameter 8.4cm is connected to another pipe of diameter 3.5cm. The speed of the water in
the bigger pipe is 1.8m/s. Find the speed of the water in the smaller pipe
Date posted: September 16, 2017. Answers (1)
- Explain how air enters the barrel of a Bunsen burner when the gas supply is opened.(Solved)
Explain how air enters the barrel of a Bunsen burner when the gas supply is opened.
Date posted: September 16, 2017. Answers (1)
- Explain how dynamic lift of the aeroplane is caused by the wings (Solved)
Explain how dynamic lift of the aeroplane is caused by the wings
Date posted: September 16, 2017. Answers (1)
- Define the term streamline flow. (Solved)
Define the term streamline flow.
Date posted: September 16, 2017. Answers (1)
- In an experiment to determine the specific latent heat of water, steam of 100°C was passed into water
Contained in a well lagged copper calorimeter....(Solved)
In an experiment to determine the specific latent heat of water, steam of 100⁰C was passed into water
Contained in a well lagged copper calorimeter. The following measurements were made:
-Mass of calorimeter =40g
-Mass of water + calorimeter = 135g.
-Final mass of calorimeter + water +condensed steam =148g
-Final temperature of the mixture =52⁰C.
Given that specific heat capacity of water = 4200Jkg^-1 k^-1
Specific heat capacity of copper = 390Jkg^-1 k^-1.
Determine the:
i)Mass of condensed steam
ii)The heat gained by the calorimeter and water if the initial temperature of the calorimeter and water
is 24⁰C
iii)Given that LV is the specific latent heat of vaporization of steam, write an expression for the heat
given out by steam.
iv)Determine the value of LV in (iii) above.
v)State the assumption made in the experiment.
Date posted: September 16, 2017. Answers (1)
- Explain how heat loss by radiation is minimized in a vacuum flask. (Solved)
Explain how heat loss by radiation is minimized in a vacuum flask.
Date posted: September 16, 2017. Answers (1)
- State one factor which affects stability of objects.(Solved)
State one factor which affects stability of objects.
Date posted: September 16, 2017. Answers (1)
- A meter rule is balanced by masses of 18g and 12g suspended from its ends. Find the position of its pivot point.(Solved)
A meter rule is balanced by masses of 18g and 12g suspended from its ends. Find the position of its pivot point.
Date posted: September 16, 2017. Answers (1)
- The volume of a fixed mass of gas collected at 73°C is 0.04m³ at normal atmospheric pressure. Determine the volume when the temperature drops to...(Solved)
The volume of a fixed mass of gas collected at 73⁰C is 0.04m³ at normal atmospheric pressure. Determine the volume when the temperature drops to 10⁰C at the same pressure.
Date posted: September 16, 2017. Answers (1)
- Explain why convection currents in gases are set up much faster than convection currents in liquids. (Solved)
Explain why convection currents in gases are set up much faster than convection currents in liquids.
Date posted: September 16, 2017. Answers (1)
- In an experiment to estimate the size of a molecule of olive oil, a drop of oil of volume 0.24mm³ was placed on a clean...(Solved)
In an experiment to estimate the size of a molecule of olive oil, a drop of oil of volume 0.24mm³ was placed on a clean water surface. The oil spread into a patch of area 4.2 x 10⁴mm². Estimate the size of a molecule of olive oil and express your answer in meters.
Date posted: September 16, 2017. Answers (1)
- Explain how aquatic animals and plants survive in a lake whose top layer is ice at 0oC.(Solved)
Explain how aquatic animals and plants survive in a lake whose top layer is ice at 0oC.
Date posted: September 16, 2017. Answers (1)
- Explain why the smell of a rotting body is very strong when the sun is hot as compared to early in the morning.(Solved)
Explain why the smell of a rotting body is very strong when the sun is hot as compared to early in the morning.
Date posted: September 16, 2017. Answers (1)
- Explain how oiling still water controls the breeding of mosquitoes(Solved)
Explain how oiling still water controls the breeding of mosquitoes
Date posted: September 16, 2017. Answers (1)
- If the ball is spinning in the anticlockwise direction, the ball is seen to move upwards from its initial path. Explain(Solved)
If the ball is spinning in the anticlockwise direction, the ball is seen to move upwards from its initial path. Explain
Date posted: September 16, 2017. Answers (1)
- Distinguish between solid and liquid using molecular motion
(Solved)
Distinguish between solid and liquid using molecular motion
Date posted: September 16, 2017. Answers (1)
- Explain how the braking system of a car works.(Solved)
Explain how the braking system of a car works.
Date posted: September 15, 2017. Answers (1)
- A magnetized bar is passed over a bunsen flame several times. When tested it is found to be demagnetized. Explain this observation. (Solved)
A magnetized bar is passed over a bunsen flame several times. When tested it is found to be demagnetized. Explain this observation.
Date posted: September 15, 2017. Answers (1)
- An uncharged metal rod is brought close but not touching the cap of a charged electroscope causes a decrease in the divergence of the leaf.(Solved)
An uncharged metal rod is brought close but not touching the cap of a charged electroscope causes a decrease in the divergence of the leaf. Explain.
Date posted: September 15, 2017. Answers (1)
- Give a reason why an air bubble increases in volume as it ascends to the surface of the liquid in a boiler.(Solved)
Give a reason why an air bubble increases in volume as it ascends to the surface of the liquid in a boiler.
Date posted: September 15, 2017. Answers (1)