Gas inside the bottle expands, pushing the cork.
The cork expands more than the bottle hence becoming loose
Kavungya answered the question on October 17, 2019 at 09:54
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State one way of increasing sensitivity of mercury in glass thermometer.
(Solved)
State one way of increasing sensitivity of mercury in glass thermometer.
Date posted:
October 17, 2019
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Answers (1)
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A mercury barometer reads 75cmHg at the base of Mt.Kenya. Assuming that the height of
the mountain is 1088m and the average density of air...
(Solved)
A mercury barometer reads 75cmHg at the base of Mt.Kenya. Assuming that the height of
the mountain is 1088m and the average density of air is 1.25kg/m3. What is the reading of the
barometer at the top of the mountain? (Take density of mercury is 13.6g/cm3.)
Date posted:
October 17, 2019
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Answers (1)
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Before using a vernier calipers to measure diameter of a steel ball, a student confirmed that it had a zero error of -0.03cm. The figure...
(Solved)
Before using a vernier calipers to measure diameter of a steel ball, a student confirmed that it had a zero error of -0.03cm. The figure below shows the vernier calipers scale when in use.
State the correct diameter of the steel ball.
Date posted:
October 17, 2019
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Answers (1)
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Figure below shows a solenoid with a ferromagnetic core connected to a battery E, ammeter A and rheostat R
On the figure indicate;
(i)The direction of current...
(Solved)
Figure below shows a solenoid with a ferromagnetic core connected to a battery E, ammeter A and rheostat R
On the figure indicate;
(i)The direction of current in the external circuit and around the coils.
(ii)The polarity of the resulting electromagnet
(iii)The direction of the magnetic field lines created around the solenoid
Date posted:
October 3, 2019
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Answers (1)
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The figure below shows a transparent water tank containing water. An electric lamp surrounded by a shield with a narrow slit of fixed at corner...
(Solved)
The figure below shows a transparent water tank containing water. An electric lamp surrounded by a shield with a narrow slit of fixed at corner A of the tank. A light ray from the slit shines on the water surface BC, at an angle of 48o as shown.
a)Determine the angle of refraction for the ray shown.
b)Complete the ray diagram to show the refracted ray.
c)Determine the angle of incidence for which the angle of refraction is 90o.
d)Calculate the speed of light in water.
Date posted:
October 3, 2019
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Answers (1)
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Explain why a 12V car battery is able to start the motor car engine while eight dry cells of 1.5 v each connected in series...
(Solved)
Explain why a 12V car battery is able to start the motor car engine while eight dry cells of 1.5 v each connected in series will not.
Date posted:
October 3, 2019
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Answers (1)
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The diagram below represents an X –ray tube. The anode is made up of copper metal and tungsten as the target.
(Solved)
The diagram below represents an X –ray tube. The anode is made up of copper metal and tungsten as the target.
a) What are the functions of parts A and B.
b) Explain how X-rays are produced from the tube
c) Why is tungsten used for the target in the tube?
d) How can the quality of X-rays produced be controlled in the tube?
e) How can the quantity of the X-rays be increased?
Date posted:
October 2, 2019
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Answers (1)
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The following results were obtained in a experiment to verify Hooke’s law when a spring was extended by hanging various loads on it.
(I) Complete...
(Solved)
The following results were obtained in a experiment to verify Hooke’s law when a spring was extended by hanging various loads on it.
(I) Complete the table for the extension e above.
(II) Plot a graph of load (y-axis) against extension
(III) From the graph determine the springs constant
(IV) Calculate the energy stored when the spring is stretched to 16 cm.
Date posted:
October 1, 2019
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Answers (1)
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A stone of mass 5g is released from a catapult. The catapult is stretched by 10cm. If the constant of elasticity is 100N/cm. Calculate;
(i)...
(Solved)
A stone of mass 5g is released from a catapult. The catapult is stretched by 10cm. If the constant of elasticity is 100N/cm. Calculate;
(i) The horizontal velocity with which the stone is released
(ii) Sketch a graph of horizontal velocity against time from the time the stone is released to when it reaches the ground.
Date posted:
October 1, 2019
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Answers (1)
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The figure below shows the variation force with extension for a steel coil spring.
(i) On the same axes, sketch the variation of force with extension...
(Solved)
The figure below shows the variation force with extension for a steel coil spring.
(i) On the same axes, sketch the variation of force with extension for a wire form which the spring is made.
(ii) Explain the difference between the two lines drawn
Date posted:
October 1, 2019
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Answers (1)
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A modern car has a strengthened passenger cage but with front and back regions which can collapse in a crash. Explain how this collapsible...
(Solved)
A modern car has a strengthened passenger cage but with front and back regions which can collapse in a crash. Explain how this collapsible regions should reduce injury in a car crash.
Date posted:
October 1, 2019
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Answers (1)
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State one way of making surface tension of water stronger.
(Solved)
State one way of making surface tension of water stronger.
Date posted:
October 1, 2019
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Answers (1)
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Explain the washing effect of soap.
(Solved)
Explain the washing effect of soap.
Date posted:
October 1, 2019
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Answers (1)
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A bullet of mass 10g travelling at a speed of 400ms-1 hits a tree trunk, it penetrates the tree trunk and stops inside the trunk...
(Solved)
A bullet of mass 10g travelling at a speed of 400ms-1 hits a tree trunk, it penetrates the tree trunk and stops inside the trunk after 4 cm.
(a) Calculate the average resistance force offered by the trunk to the bullet.
(b) State the energy changes that takes place.
Date posted:
October 1, 2019
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Answers (1)
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Explain why a hole in a ship near the bottom is more dangerous than the one near the top
(Solved)
Explain why a hole in a ship near the bottom is more dangerous than the one near the top
Date posted:
October 1, 2019
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Answers (1)
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The figure below shows a pith ball being lifted into the funnel by blowing air into the funnel
Explain this observation
(Solved)
The figure below shows a pith ball being lifted into the funnel by blowing air into the funnel
Explain this observation
Date posted:
October 1, 2019
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Answers (1)
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A uniform metre rule of mass 40g is pivoted at the 60cm mark and held horizontally with a vertical string as shown below. Determine the...
(Solved)
A uniform metre rule of mass 40g is pivoted at the 60cm mark and held horizontally with a vertical string as shown below. Determine the tension in the string.
Date posted:
October 1, 2019
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Answers (1)
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The figure below shows a bimetallic wheel whose diameter is not affected by changes in temperature. Briefly explain how the diameter of the wheel remain...
(Solved)
The figure below shows a bimetallic wheel whose diameter is not affected by changes in temperature. Briefly explain how the diameter of the wheel remain unchanged as the temperature increases
Date posted:
October 1, 2019
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Answers (1)
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The diagram below shows two trolleys, A and B connected to each other by an elastic strip of negligible mass.
(Solved)
The diagram below shows two trolleys, A and B connected to each other by an elastic strip of negligible mass. The trolleys are pulled apart on a smooth plane till tension in the elastic strip is 4.0N and are then released suddenly
(a) State with reason the total momentum of the trolleys when they are just released
(b) Calculate the initial acceleration of trolley A when released
(c) The velocity of the trolley B is 0.9ms-1 just before it collides with A. Determine the velocity of A just before the collision
(d) Which trolley covers a longer distance before collision? Explain
(e) Explain why the elastic strip may not stretch to the same original length after impact
Date posted:
October 1, 2019
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Answers (1)
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A u-tube vertically holds two liquids L1 and L2 as shown in the figure below
(Solved)
A u-tube vertically holds two liquids L1 and L2 as shown in the figure below
(a) Mark accurately the point in liquid L2 that is at the same pressure as point P
(b) Determine the number of times L1 is denser than L2
Date posted:
October 1, 2019
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Answers (1)