i) To remove the air from the bottle
ii) Pressure imbalance on the inside and outside causes the higher atmospheric pressure on the outside to act on the bottle
iii) The hot water drives air out of the bottle. On cooling, the steam inside condenses creating a region of low pressure inside. The higher atmospheric pressure deforms the bottle
johnmulu answered the question on February 6, 2017 at 08:54
-
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)
-
State the reason why water spilled on a glass surface wets the surface.
(Solved)
State the reason why water spilled on a glass surface wets the surface.
Date posted:
February 6, 2017
.
Answers (1)
-
A butcher has a beam balance and masses 0.5 kg and 2 kg. How would he measure 1.5 kg of meat on the balance at once?
(Solved)
A butcher has a beam balance and masses 0.5 kg and 2 kg. How would he measure 1.5 kg of meat on the balance at once?
Date posted:
February 6, 2017
.
Answers (1)
-
Why does the weight of the body vary from place to place?
(Solved)
Give reason why the weight of the body varies from place to place.
Date posted:
February 6, 2017
.
Answers (1)
-
Name two forces that determine the shape of liquid drop on a solid surface.
(Solved)
Name two forces that determine the shape of liquid drop on a solid surface.
Date posted:
February 6, 2017
.
Answers (1)
-
A student measured the length of a wire four times using a metre rule and obtained the following readings
(Solved)
A student measured the length of a wire four times using a metre rule and obtained the following readings: 18.6 cm; 18.5 cm and 18.6 cm. Determine the length the length the student should record
Date posted:
February 6, 2017
.
Answers (1)
-
State the reason why it is not correct to quote the weight of solid objects in kilograms
(Solved)
State the reason why it is not correct to quote the weight of solid objects in kilograms
Date posted:
February 6, 2017
.
Answers (1)
-
A stopwatch started 0.50s after the start button was pressed. The time recorded using the stopwatch for a ball bearing falling through a liquid was 2.53s.
(Solved)
A stopwatch started 0.50s after the start button was pressed. The time recorded using the stopwatch for a ball bearing falling through a liquid was 2.53s. Determine the time of fall.
Date posted:
February 6, 2017
.
Answers (1)