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In an experiment to determine the specific latent heat of vaporization of water, steam at 1000C was passed into water contained in a well lagged...
(Solved)
In an experiment to determine the specific latent heat of vaporization of water, steam at 1000C was passed into water contained in a well lagged copper calorimeter. The following measurements were made:
- Mass of calorimeter = 55g
- Initial mass of water = 75g
-Final mass of calorimeter + water + condensed steam = 133g
- Final temperature of the mixture = 300C.
Specific heat capacity of water = 4200J/Kg/K.
Specific heat capacity of copper = 390J/Kg/K.
Determine the:
i)Mass of condensed steam
ii)Heat gained by the calorimeter and water if the initial temperature of the calorimeter
+ water = 200C
iii)Given that L is the specific latent heat of vaporization of steam.
(I)Write an expression for the heat given out by steam.
(II)Determine the value of L.
Date posted:
October 30, 2019
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Answers (1)
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Figure below shows a uniform metre rule balancing when a mass of 200g is hung at one end.
Determine the tension T in the string.
(Solved)
Figure below shows a uniform metre rule balancing when a mass of 200g is hung at one end.
Determine the tension T in the string.
Date posted:
October 30, 2019
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Answers (1)
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The figure below shows a measuring cylinder which contains water initially at a level A.
A spherical solid is immersed in the water and the level...
(Solved)
The figure below shows a measuring cylinder which contains water initially at a level A.
A spherical solid is immersed in the water and the level rises to B.
Determine the diameter of the spherical ball.
Date posted:
October 30, 2019
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Answers (1)
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i)Why should argon gas be at low pressure in a Geiger–Muller tube?
ii)State the purpose of the bromine gas in the tube.
(Solved)
i)Why should argon gas be at low pressure in a Geiger–Muller tube?
ii)State the purpose of the bromine gas in the tube.
Date posted:
October 17, 2019
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Answers (1)
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An object 10cm high is placed 30cm in front of a concave mirror. The image is 45cm in front of the mirror. Find its magnification...
(Solved)
An object 10cm high is placed 30cm in front of a concave mirror. The image is 45cm in front of the mirror. Find its magnification and size of the image.
Date posted:
October 17, 2019
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Answers (1)
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In an attempt to make a magnet, a student used the double stroke method as shown below.
State the polarities at the ends A and B
(Solved)
In an attempt to make a magnet, a student used the double stroke method as shown below.
State the polarities at the ends A and B
Date posted:
October 17, 2019
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Answers (1)
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500g of water at 200C is mixed with 200g of water at 550C. Find the final temperature of the mixture.
(Solved)
500g of water at 200C is mixed with 200g of water at 550C. Find the final temperature of the mixture.
Date posted:
October 17, 2019
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Answers (1)
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A car moving initially at 10m/s decelerates at 2.5m/s2
Determine:
i)I) Its velocity after 1.5seconds.
II)The distance travelled in 1.5 seconds.
III)The time taken for the car to stop.
ii)Sketch...
(Solved)
A car moving initially at 10m/s decelerates at 2.5m/s2
Determine:
i)I) Its velocity after 1.5seconds.
II)The distance travelled in 1.5 seconds.
III)The time taken for the car to stop.
ii)Sketch the velocity – time graph for the motion of the car up to the time the car stopped.
iii)From the graph determine the distance the car travelled before stopping.
Date posted:
October 17, 2019
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Answers (1)
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The diagram below shows a six’s maximum/ minimum thermometer.
a)What is the thermometric liquid in this thermometer?
b)Why is it necessary for the vapour in bulb B...
(Solved)
The diagram below shows a six’s maximum/ minimum thermometer.
)What is the thermometric liquid in this thermometer?
b)Why is it necessary for the vapour in bulb B to be saturated?
c)Explain how the thermometer indicates maximum and minimum temperature.
d)Indicate on the diagram the two points where the reading of the temperature shown by the
thermometer can be made.
Date posted:
October 17, 2019
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Answers (1)
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Use the figure below to answer the questions that follow
i)What pressure is acting on point A?
ii)What is the value of pressure difference in the...
(Solved)
Use the figure below to answer the questions that follow
i)What pressure is acting on point A?
ii)What is the value of pressure difference in the instrument reading?
iii)If the atmospheric pressure is 760mm of mercury, what is the value of gas pressure?
Date posted:
October 17, 2019
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Answers (1)
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The figure below shows an incompressible fluid moving through a tube of varied cross- sectional area. If the area of the small tube is 0.05m2,...
(Solved)
The figure below shows an incompressible fluid moving through a tube of varied cross- sectional area. If the area of the small tube is 0.05m2, calculate the diameter of the large tube in cm.
Date posted:
October 17, 2019
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Answers (1)
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The figure below shows two light sheets of paper arranged as shown.
Explain the observation made when air is blown at the same speed and time...
(Solved)
The figure below shows two light sheets of paper arranged as shown.
Explain the observation made when air is blown at the same speed and time at points A and B.
Date posted:
October 17, 2019
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Answers (1)
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Distinguish between streamline and turbulent flow.
(Solved)
Distinguish between streamline and turbulent flow.
Date posted:
October 17, 2019
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Answers (1)
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A bullet of mass 20g moving with a velocity of 30m/s penetrates a sand bag and it’s brought to rest in 0.05 seconds. Find the...
(Solved)
A bullet of mass 20g moving with a velocity of 30m/s penetrates a sand bag and it’s brought to rest in 0.05 seconds. Find the average retarding force of the sand.
Date posted:
October 17, 2019
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Answers (1)
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A tightly fitted bottle cork will be easier to remove if the bottle is warmed. Explain this using kinetic and thermal property of matter.
(Solved)
A tightly fitted bottle cork will be easier to remove if the bottle is warmed.
Explain this using kinetic and thermal property of matter.
Date posted:
October 17, 2019
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Answers (1)
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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)