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For an echo to be heard, the minimum distance between the obstacle and the observer must be 17m.If the minimum time for hearing an echo...
(Solved)
For an echo to be heard, the minimum distance between the obstacle and the observer must be 17m.If the minimum time for hearing an echo is 0.1 seconds. Determine the speed of sound in air.
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows plane waves incident on a plane reflector inclined at 60oC to the horizontal.
Complete the diagram to show reflected waves.
(Solved)
The figure below shows plane waves incident on a plane reflector inclined at 60oC to the horizontal.
Complete the diagram to show reflected waves.
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows a plane mirror and the word PHYSICS written on its front.
On the same diagram, write down the appearance of the word...
(Solved)
The figure below shows a plane mirror and the word PHYSICS written on its front.
On the same diagram, write down the appearance of the word after reflection on the mirror.
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows a turn table on which a mass of 50g is placed 10cm from the centre.
Frictional force between the 50g mass and...
(Solved)
The figure below shows a turn table on which a mass of 50g is placed 10cm from the centre.
Frictional force between the 50g mass and the turn table is 0.4N. When the turntable is made to rotate with angular velocity of
ὦ rads-1 the mass must starts to slide off.
i) Determine the :
I. angular velocity ὦ,
II. time taken to make one complete revolution
ii) On the figure draw a path that would be taken by the 50g mass if the turntable suddenly came to a stop.
Date posted:
May 30, 2019
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Answers (1)
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Sketch the graph of density of water against temperature upto 10oC.
(Solved)
Sketch the graph of density of water against temperature upto 10oC.
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows variation of volume of water and temperature as water is heated from 0oC to 40oC
State the value of P.
(Solved)
The figure below shows variation of volume of water and temperature as water is heated from 0oC to 40oC
State the value of P.
Date posted:
May 30, 2019
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Answers (1)
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Apart from the definitions, distinguish between temperature and heat.
(Solved)
Apart from the definitions, distinguish between temperature and heat.
Date posted:
May 30, 2019
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Answers (1)
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An air bubble rises from the bottom of a pond 20m deep until it reaches the top of the pond. The graph below shows variation...
(Solved)
An air bubble rises from the bottom of a pond 20m deep until it reaches the top of the pond. The graph below shows variation of pressure exerted on the bubble with volume of the bubble.
i) From the graph, determine the pressure exerted on the bubble and volume of bubble at
I. the bottom of the pond
II. the top of the pond
ii) Explain the shape of the graph.
iii) Determine the atmospheric pressure at the place of the experiment.
iv) Sketch in the space below the graph of pressure against reciprocal of pressure for the bubble.
Date posted:
May 30, 2019
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Answers (1)
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State two factors that must be kept constant for a gas to obey Boyle’s law.
(Solved)
State two factors that must be kept constant for a gas to obey Boyle’s law.
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows two connected bodies of masses 0.5kg and 50g joined by a light inextensible string passing over a smooth pulley. When released,...
(Solved)
The figure below shows two connected bodies of masses 0.5kg and 50g joined by a light inextensible string passing over a smooth pulley. When released, the 0.5kg mass moves a distance of 0.6m before coming to rest. The coefficient of friction between the 50g mass and the table is 0.3.
i) Determine :
I. the tension on the string.
II. the acceleration of the 0.5kg mass.
ii) Find the velocity of the 0.5kg mass just before hitting the ground.
Date posted:
May 30, 2019
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Answers (1)
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On a certain planet a simple pendulum of length 0.5m oscillates with a frequency of 1.25Hz. If the mass of the body
suspended on the body...
(Solved)
On a certain planet a simple pendulum of length 0.5m oscillates with a frequency of 1.25Hz. If the mass of the body
suspended on the body is 50g.
Determine :
i) the acceleration of gravity on the planet.
ii) the weight of the body on the planet.
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows a tube of varying cross-sectional area fitted with narrow tubes of uniform cross-sectional areas h1, h2,
h3 and h4 represent the heights...
(Solved)
The figure below shows a tube of varying cross-sectional area fitted with narrow tubes of uniform cross-sectional areas h1, h2,
h3 and h4 represent the heights of water column as the water flows in the tube at varied speeds. Arrange the heights h1, h2, h3
and h4 in increasing order starting with the lowest.
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows a log of wood 2m long lying on a flat ground. Two forces F1 and F2 applied at the ends of...
(Solved)
The figure below shows a log of wood 2m long lying on a flat ground. Two forces F1 and F2 applied at the ends of the log will
just lift the log while maintaining horizontal position.
Determine :
a) the weight of the log.
b) the perpendicular distance from the centre of gravity of the log to force F2
Date posted:
May 30, 2019
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Answers (1)
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State one similarity between “moment of force about a point” and “work done”
(Solved)
State one similarity between “moment of force about a point” and “work done”
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows two balloons containing two different gases suspended on a rod. The set up is in equilibrium.
When the set up is moved...
(Solved)
The figure below shows two balloons containing two different gases suspended on a rod. The set up is in equilibrium.
When the set up is moved in hot sun the system tips to the right.
a) Compare expansivity of the gases A and B.
b) Explain your answer to (a) above.
Date posted:
May 30, 2019
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Answers (1)
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Explain why gases have larger intermolecular distances than solids.
(Solved)
Explain why gases have larger intermolecular distances than solids.
Date posted:
May 30, 2019
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Answers (1)
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The figure shows a U-tube connected to gas supply containing liquids L1 and L2 of densities 1.8gcm-3 and 0.8gcm-3 respectively in equilibrium.
Given that h1 =...
(Solved)
The figure shows a U-tube connected to gas supply containing liquids L1 and L2 of densities 1.8gcm-3 and 0.8gcm-3 respectively in equilibrium.
Given that h1 = 8cm, h2 = 10cm and atmospheric pressure is 1.02 x 105Pa. Determine the gas pressure.
Date posted:
May 30, 2019
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Answers (1)
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Give a reason why mercury is preferred for use in a thermometer.
(Solved)
Give a reason why mercury is preferred for use in a thermometer.
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows a glass tube dipped in water inside a trough. The cross sectional area of the tube is 2cm2.
Determine the adhesive...
(Solved)
The figure below shows a glass tube dipped in water inside a trough. The cross sectional area of the tube is 2cm2.
Determine the adhesive force between water and glass. (Take density of water = 1000kgm-3, acceleration due to gravity =
10ms-2).
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows a burette containing a liquid up to the level marked on the figure. 20 drops of the liquid are now run...
(Solved)
The figure below shows a burette containing a liquid up to the level marked on the figure. 20 drops of the liquid are now run out of the burette. If each drop has a volume of 1.1ml. Mark on the figure the new level of the liquid in the burette.
Date posted:
May 30, 2019
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Answers (1)