- A balloon weighs 10N and has a gas capacity of 2m3. The gas in the balloon has a density of 0.1kg/m3.
If density of air is...(Solved)
A balloon weighs 10N and has a gas capacity of 2m3. The gas in the balloon has a density of 0.1kg/m3.
If density of air is 1.3kgm-3, calculate the resultant force of the balloon when it is floating in air.
Date posted: May 25, 2019. Answers (1)
- A piece of sealing wax, weight 3N in air and 0.22N when immersed in water, calculate the density of the wax.(Solved)
A piece of sealing wax, weight 3N in air and 0.22N when immersed in water, calculate the density of the wax.
Date posted: May 25, 2019. Answers (1)
- A block of wood measuring 0.8m by 0.5m by 2m floats in water. 1.2m of the block is submerged.
(i) Determine the weight of the water...(Solved)
A block of wood measuring 0.8m by 0.5m by 2m floats in water. 1.2m of the block is submerged.
(i) Determine the weight of the water displaced.
(ii) Find the force required to just make the block fully submerged.
Date posted: May 25, 2019. Answers (1)
- A glass capillary contains enclosed air by a thread of mercury 15cm long when the tube is horizontal, the length of the enclosed air column...(Solved)
A glass capillary contains enclosed air by a thread of mercury 15cm long when the tube is horizontal, the length of the enclosed air column is 24cm as shown.
(i) What is the length of the enclosed air column when the tube is vertical with the open end uppermost if the atmospheric pressure is 750mmHg?
(ii) What is the length of the enclosed air column when the tube is vertical with the closed end upper most if the atmospheric pressure is 750mmHg.
(iii) Explain why the mercury does not run out when the tube is vertical with the closed end uppermost.
Date posted: May 25, 2019. Answers (1)
- The figure below shows an inclined plane, a trolley of mass 60kg being pulled up the slope by a force of 200N parallel to the...(Solved)
The figure below shows an inclined plane, a trolley of mass 60kg being pulled up the slope by a force of 200N parallel to the slope. The trolley is moved from X to Y.
Determine the
(i) Work output of the system.
(ii) Work input of the system.
(iii) The frictional force between the wheels of the trolley and the inclined plane.
(iv) The efficiency of the system.
(v) The velocity ratio of the system.
Date posted: May 25, 2019. Answers (1)
- A uniform metal strip is 3.0cm wides 0.6cm thick and 100cm long. The density of the metal is 2.7g/cm3.
Determine the weight of the metal strip.(Solved)
A uniform metal strip is 3.0cm wides 0.6cm thick and 100cm long. The density of the metal is 2.7g/cm3.
Determine the weight of the metal strip.
Date posted: May 25, 2019. Answers (1)
- The graph (curve) below show the variation of force against extension (cm) of two spiral springs of same material, same wire thickness length but of...(Solved)
The graph (curve) below show the variation of force against extension (cm) of two spiral springs of same material, same wire thickness length but of different diameters (one large and the other small). Identify which graph (A or B) represents which spring.
Date posted: May 25, 2019. Answers (1)
- When the flask is placed in iced water the level on water rose and then fell. Explain this observation.(Solved)
When the flask is placed in iced water the level on water rose and then fell. Explain this observation.
Date posted: May 25, 2019. Answers (1)
- A 20kw immersion water heater is used to heat 5.0 x 10-3m3 of water from 23oC to 100oC. Given that 30% of heat is lost...(Solved)
A 20kw immersion water heater is used to heat 5.0 x 10-3m3 of water from 23oC to 100oC. Given that 30% of heat is lost to the surroundings, determine the time used in heating the water.
Date posted: May 25, 2019. Answers (1)
- An aircraft 300m from the ground traveling horizontally at 400m/s releases a parcel. Calculate the horizontal distance covered by the parcel from the point of...(Solved)
An aircraft 300m from the ground traveling horizontally at 400m/s releases a parcel. Calculate the horizontal distance covered by the parcel from the point of release.(Ignore air resistance).
Date posted: May 25, 2019. Answers (1)
- In an experiment a crystal of potassium permanganate was placed in water as shown below.
After sometime, it was observed that the water turned purple. Explain...(Solved)
In an experiment a crystal of potassium permanganate was placed in water as shown below.
After sometime, it was observed that the water turned purple. Explain this observation.
Date posted: May 25, 2019. Answers (1)
- The figure below shows a capillary tube placed in a trough of mercury.
Give a reason why the level of mercury in a capillary is lower...(Solved)
The figure below shows a capillary tube placed in a trough of mercury.
Give a reason why the level of mercury in a capillary is lower than in the beaker.
Date posted: May 25, 2019. Answers (1)
- The figure below shows a pith ball in a container.
State and explain what would happen if air is blown over the mouth of the...(Solved)
The figure below shows a pith ball in a container.
State and explain what would happen if air is blown over the mouth of the container.
Date posted: May 25, 2019. Answers (1)
- Sketch a velocity – time graph for a body initially moving at a velocity u before a force F is applied to it for 5...(Solved)
Sketch a velocity – time graph for a body initially moving at a velocity u before a force F is applied to it for 5 seconds and there after the force F is withdrawn.
Date posted: May 25, 2019. Answers (1)
- A turntable of radius 16cm is rotating at 960 revolutions per minute. Determine the angular speed of the turntable.(Solved)
A turntable of radius 16cm is rotating at 960 revolutions per minute. Determine the angular speed of the turntable.
Date posted: May 25, 2019. Answers (1)
- A bus that carries goods in the under seats carrier is more stable than one that carries goods in the carrier at the top. Explain...(Solved)
A bus that carries goods in the under seats carrier is more stable than one that carries goods in the carrier at the top. Explain why this is so.
Date posted: May 25, 2019. Answers (1)
- The figure below shows two identical containers A and B containing hot water and ice block.
State with reason which water cools faster assuming that the...(Solved)
The figure below shows two identical containers A and B containing hot water and ice block.
State with reason which water cools faster assuming that the wire gauge absorbs negligible heat.
Date posted: May 25, 2019. Answers (1)
- The diagram below shows a section of a micrometer screw gauge.
a) State the smallest measurement that can be made by the measurement that can be...(Solved)
The diagram below shows a section of a micrometer screw gauge.
a) State the smallest measurement that can be made by the measurement that can be made by the micrometer screw gauge.
b) The thimble of the micrometer screw gauge is rotated through 2 ½ revolutions in the clockwise direction in order to
measure the diameter of a marble. State the diameter of the marble.
Date posted: May 25, 2019. Answers (1)
- The figure below shows a wire wound on a metal rod. The windings just touch each other. If the total number of complete loops was...(Solved)
The figure below shows a wire wound on a metal rod. The windings just touch each other. If the total number of complete loops was found to be 25 and the distance covered by the windings on the rod is 0.6cm, find the radius of the wire giving your answer in standard form.
Date posted: May 25, 2019. Answers (1)
- Calculate the critical angle of a ray of light passing from glass to water, if their refractive indices are 2/3 and 4/3 respectively.(Solved)
Calculate the critical angle of a ray of light passing from glass to water, if their refractive indices are 2/3 and 4/3 respectively.
Date posted: May 25, 2019. Answers (1)