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- Calculate the amount of heat required to melt 30g of ice that 0°C.
(Latent heat of fusion of ice is 3.34 × 105 j/Kg)
Give your answer...(Solved)
Calculate the amount of heat required to melt 30g of ice that 0°C.
(Latent heat of fusion of ice is 3.34 × 105 j/Kg)
Give your answer correct to two decimal places.
Date posted: May 30, 2019. Answers (1)
- A metal cube weighs 1.0N in air and 0.8N when totally immersed in water.
Calculate
(i) Volume of water it displaces.
(ii) the density of the cube(Solved)
A metal cube weighs 1.0N in air and 0.8N when totally immersed in water.
Calculate
(i) Volume of water it displaces.
(ii) the density of the cube
Date posted: May 30, 2019. Answers (1)
- An object is attached to a spring balance and its weight determined in air. It is then gently lowered into a beaker containing water.
(i) State...(Solved)
An object is attached to a spring balance and its weight determined in air. It is then gently lowered into a beaker containing water.
(i) State what happens to the reading.
(ii) Explain the force that causes observation in (i) above.
Date posted: May 30, 2019. Answers (1)
- The speed of a train, hauled by a locomotive varies as shown below as it travels between two stations along a straight
horizontal track.
Use the graph...(Solved)
The speed of a train, hauled by a locomotive varies as shown below as it travels between two stations along a straight
horizontal track.
Use the graph to determine:
i) the maximum speed of the train.
ii) The acceleration of the train during the first 2mins of the journey.
iii) The time during which the train is slowing down.
iv) The total distance, in metres, between the two stations.
v) The average speed in m/s of the train.
Date posted: May 30, 2019. Answers (1)
- A boy on a bicycle accelerated uniformly at 1m/s2 for 10 seconds from an initial velocity of 4m/s. Calculate the distance travelled in this time.(Solved)
A boy on a bicycle accelerated uniformly at 1m/s2 for 10 seconds from an initial velocity of 4m/s. Calculate the distance travelled in this time.
Date posted: May 30, 2019. Answers (1)
- A boy wants to rescue someone who has fallen through ice pond. Would it be safe to walk or crawl across the ice towards
him? Explain.(Solved)
A boy wants to rescue someone who has fallen through ice pond. Would it be safe to walk or crawl across the ice towards
him? Explain.
Date posted: May 30, 2019. Answers (1)
- A weather balloon contains 100m³ of helium when atmospheric pressure is 90Kpa. If the atmosphere pressure changes to
100Kpa, calculate the new volume.(Solved)
A weather balloon contains 100m³ of helium when atmospheric pressure is 90Kpa. If the atmosphere pressure changes to
100Kpa, calculate the new volume.
Date posted: May 30, 2019. Answers (1)
- Carbon dioxide is used to make fizzy drinks. It is stored in high pressure in cast iron cylinder. The figure below represents the
particles in a...(Solved)
Carbon dioxide is used to make fizzy drinks. It is stored in high pressure in cast iron cylinder. The figure below represents the
particles in a cylinder of carbon dioxide.
Describe how particles of carbon dioxide exert pressure.
Date posted: May 30, 2019. Answers (1)
- The figure below shows a funnel dipped into a liquid soap solution.
Explain what happens to the soap bubble when the soap is removed.(Solved)
The figure below shows a funnel dipped into a liquid soap solution.
Explain what happens to the soap bubble when the soap is removed.
Date posted: May 30, 2019. Answers (1)
- A solid displaces 8.5cm³ of liquid when floating on a certain liquid and 11.5cm³ when fully submerged with liquid. The
density of solid in 0.8g/cm³, determine:-
i)...(Solved)
A solid displaces 8.5cm³ of liquid when floating on a certain liquid and 11.5cm³ when fully submerged with liquid. The
density of solid in 0.8g/cm³, determine:-
i) Upthrust on the solid when floating.
ii) Density of the liquid.
Date posted: May 30, 2019. Answers (1)
- The figure below shows an empty beaker placed on the top of a pan calibrated in grammes. 50ml of alcohol of density 0.8g/cm3 was added...(Solved)
The figure below shows an empty beaker placed on the top of a pan calibrated in grammes. 50ml of alcohol of density 0.8g/cm3 was added to the beaker.
Show on the figure the new pointer position.
Date posted: May 30, 2019. Answers (1)
- The figure shows a piece of cork held with a light thread attached to the bottom of a beaker. The beaker is filled with
water.
i) Indicate...(Solved)
The figure shows a piece of cork held with a light thread attached to the bottom of a beaker. The beaker is filled with
water.
i) Indicate and label on the diagram the forces acting on the cork.
ii) Write an expression showing the relationship between the forces.
Date posted: May 30, 2019. Answers (1)
- On the set of axes below show how the volume of an ideal gas varies with pressure.(Solved)
On the set of axes below show how the volume of an ideal gas varies with pressure.
Date posted: May 30, 2019. Answers (1)
- The figure below shows the use of pulleys in holding a cable taut.
a) What is the purpose of pulley X?
b) How do the pulleys...(Solved)
The figure below shows the use of pulleys in holding a cable taut.
a) What is the purpose of pulley X?
b) How do the pulleys used serve the purpose of the arrangement?
Date posted: May 30, 2019. Answers (1)
- A girl blew air along the horizontal plane below the paper as shown in figure below.
State and explain what would be observed.(Solved)
A girl blew air along the horizontal plane below the paper as shown in figure below.
State and explain what would be observed.
Date posted: May 30, 2019. Answers (1)
- The figure below shows a ball being whirled in a vertical plane.
Sketch on the figure the path followed by the ball if the string cuts...(Solved)
The figure below shows a ball being whirled in a vertical plane.
Sketch on the figure the path followed by the ball if the string cuts when the ball is in the position shown in the figure.
Date posted: May 30, 2019. Answers (1)
- A motor car is uniformly retarded and brought to rest from a speed of 108 km/h in 15 sec. Find its acceleration.(Solved)
A motor car is uniformly retarded and brought to rest from a speed of 108 km/h in 15 sec. Find its acceleration.
Date posted: May 30, 2019. Answers (1)
- The figure shows an instrument used to measure atmospheric pressure.
a) Name the instrument.
b) Name the liquid marked L.(Solved)
The figure shows an instrument used to measure atmospheric pressure.
a) Name the instrument.
b) Name the liquid marked L.
Date posted: May 30, 2019. Answers (1)
- A man has 2m³ of concrete delivered to his home and he needed to carry it down in a wheelbarrow. If each barrow load weighs...(Solved)
A man has 2m³ of concrete delivered to his home and he needed to carry it down in a wheelbarrow. If each barrow load weighs 2500N, how many trips will he have to make?
(Density of concrete = 3000kgm-3).
Date posted: May 30, 2019. Answers (1)
- The figure below shows a section of a vernier calliper scale.
State the reading of the diameter being measured.(Solved)
The figure below shows a section of a vernier calliper scale.
State the reading of the diameter being measured.
Date posted: May 30, 2019. Answers (1)