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Hydrogen: It diffuses faster than helium since it is less dense
johnmulu answered the question on February 6, 2017 at 09:06
- State the reason why gases are easily compressible while liquids and solids are not(Solved)
State the reason why gases are easily compressible while liquids and solids are not
Date posted: February 6, 2017. Answers (1)
- In the Brownian motion experiment, smoke particles are observed to move randomly(Solved)
In the Brownian motion experiment, smoke particles are observed to move randomly. Explain how this motion is caused.
Date posted: February 6, 2017. Answers (1)
- A balloon is filled with hydrogen gas and then released into the air. It is observed that as it rises higher into the air it expands(Solved)
A balloon is filled with hydrogen gas and then released into the air. It is observed that as it rises higher into the air it expands. Explain why it expands
Date posted: February 6, 2017. Answers (1)
- A student wearing sharp pointed heeled shoes is likely to damage a soft wooden floor(Solved)
A student wearing sharp pointed heeled shoes is likely to damage a soft wooden floor. Explain
Date posted: February 6, 2017. Answers (1)
- State two factors that determine the pressure at a point in a liquid(Solved)
State two factors that determine the pressure at a point in a liquid.
Date posted: February 6, 2017. Answers (1)
- Explain why brakes fail in a hydraulic breaking system when air gets into the system(Solved)
Explain why brakes fail in a hydraulic breaking system when air gets into the system.
Date posted: February 6, 2017. Answers (1)
- In an experiment to demonstrate atmospheric pressure, a plastic bottle is partially filled with hot water and the bottle is then tightly corked(Solved)
In an experiment to demonstrate atmospheric pressure, a plastic bottle is partially filled with hot water and the bottle is then tightly corked. After some time the bottle starts to get deformed.
i) State the purpose of the hot water
ii) State the reason why the bottle gets deformed
iii) Explain your answer in (ii)
Date posted: February 6, 2017. Answers (1)
- When a bicycle pump was sealed at the nozzle and the handle slowly pushed towards the nozzle, the pressure of the air inside increased(Solved)
When a bicycle pump was sealed at the nozzle and the handle slowly pushed towards the nozzle, the pressure of the air inside increased. Explain this observation.
Date posted: February 6, 2017. Answers (1)
- Some water in a tin can was boiled for some time. The tin can was then sealed and cooled. After some time it collapsed(Solved)
Some water in a tin can was boiled for some time. The tin can was then sealed and cooled. After some time it collapsed. Explain this observation
Date posted: February 6, 2017. Answers (1)
- State Pascal's Principle of transmission of pressure in fluids(Solved)
State Pascal's Principle of transmission of pressure in fluids.
Date posted: February 6, 2017. Answers (1)
- The total weight of a car with passengers is 25, 000 N. The area of contact of each of the four tyres with the ground is 0.025m2(Solved)
The total weight of a car with passengers is 25, 000 N. The area of contact of each of the four tyres with the ground is 0.025m2. Determine the minimum car tyre pressure
Date posted: February 6, 2017. Answers (1)
- State one advantage of fitting wide tyre on a vehicle that moves on earth roads(Solved)
State one advantage of fitting wide tyre on a vehicle that moves on earth roads.
Date posted: February 6, 2017. Answers (1)
- The height of the mercury column in a barometer at a place is 64 cm. What would be the height of a column of paraffin in barometer at the same place?(Solved)
The height of the mercury column in a barometer at a place is 64 cm. What would be the height of a column of paraffin in barometer at the same place?
(Density of paraffin = 8.0 X 102kgm-3)
Date posted: February 6, 2017. Answers (1)
- A small nail may pierce an inflated car tyre and remain there without pressure reduction in the tyre(Solved)
A small nail may pierce an inflated car tyre and remain there without pressure reduction in the tyre. Explain this observation.
Date posted: February 6, 2017. Answers (1)
- A solid weighs 16.5 N on the surface of the moon. The force of gravity on the moon is 1.7NKg-1. Determine the mass of the solid.(Solved)
A solid weighs 16.5 N on the surface of the moon. The force of gravity on the moon is 1.7NKg-1. Determine the mass of the solid.
Date posted: February 6, 2017. Answers (1)
- A steel needle when placed carefully on water can be made to float. When a detergent is added to the water it sinks(Solved)
A steel needle when placed carefully on water can be made to float. When a detergent is added to the water it sinks. Explain this observation
Date posted: February 6, 2017. Answers (1)
- State two ways of reducing surface tension in water(Solved)
State ways of reducing surface tension in water.
Date posted: February 6, 2017. Answers (1)
- One factor that affect the surface tension of a liquid is the presence of impurities. State one other factor(Solved)
One factor that affect the surface tension of a liquid is the presence of impurities. State one other factor
Date posted: February 6, 2017. Answers (1)
- A bag of sugar is found to have the same weight on planet earth as an identical bag of dry sawdust on planet Jupiter(Solved)
A bag of sugar is found to have the same weight on planet earth as an identical bag of dry sawdust on planet Jupiter. Explain why the masses of the two bags must be different.
Date posted: February 6, 2017. Answers (1)
- A metal pin was observed to float on the surface of pure water. However the pin sank when a few drops of soap solution were carefully added to the water(Solved)
A metal pin was observed to float on the surface of pure water. However the pin sank when a few drops of soap solution were carefully added to the water. Explain this observation
Date posted: February 6, 2017. Answers (1)