There is change of direction with time.
Kavungya answered the question on June 3, 2019 at 08:10
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A block of metal of mass 150g at 1000C is dropped into a lagged calorimeter of heat capacity 40Jk-1 containing 100g of water at 250C....
(Solved)
A block of metal of mass 150g at 1000C is dropped into a lagged calorimeter of heat capacity 40Jk-1 containing 100g of water at 250C. The temperature of the resulting mixture is 340C. (Specific heat capacity of water = 4200Jkgˉ¹).
Determine;
(i) Heat gained by calorimeter.
(ii) Heat gained by water.
(iii) Heat lost by the metal block.
(iv) Specific heat capacity of the metal block.
Date posted:
June 3, 2019
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Answers (1)
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State the difference between the temperature measured in Kelvin scale and Celsius scale.
(Solved)
State the difference between the temperature measured in Kelvin scale and Celsius scale.
Date posted:
June 3, 2019
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Answers (1)
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A steel cylinder of capacity 0.5m³ contains nitrogen at a pressure of 30,000Pa when the temperature is 270C. What will be the pressure of nitrogen...
(Solved)
A steel cylinder of capacity 0.5m³ contains nitrogen at a pressure of 30,000Pa when the temperature is 270C. What will be the pressure of nitrogen if it is allowed to flow into another cylinder of capacity 9.5m³ with the temperature reduced to -230C?
Date posted:
June 3, 2019
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Answers (1)
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The figure below shows a set-up that may be used to verify pressure law.
(i) State the measurements that should be taken in the experiment.
(ii) Explain...
(Solved)
The figure below shows a set-up that may be used to verify pressure law.
(i) State the measurements that should be taken in the experiment.
(ii) Explain how the measurements in (i) above may be used to verify pressure law.
Date posted:
June 3, 2019
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Answers (1)
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What is meant by the term “banking” of the road?
(Solved)
What is meant by the term “banking” of the road?
Date posted:
June 3, 2019
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Answers (1)
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When the temperature of a gas in a closed container is raised, the pressure of the gas increases. Explain in terms of kinetic energy how...
(Solved)
When the temperature of a gas in a closed container is raised, the pressure of the gas increases. Explain in terms of kinetic energy how the molecules of the gas cause an increase in pressure.
Date posted:
June 3, 2019
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Answers (1)
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A uniform metre rule pivoted at it’s 15.0cm mark is balanced by a 2N weight suspended at the 5.0cm mark. Determine the mass of the...
(Solved)
A uniform metre rule pivoted at it’s 15.0cm mark is balanced by a 2N weight suspended at the 5.0cm mark. Determine the mass of the metre rule.
Date posted:
June 3, 2019
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Answers (1)
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On the Cartesian plan below sketch a graph to show how the density of water varies from O0C to 100C.
(Solved)
On the Cartesian plan below sketch a graph to show how the density of water varies from O0C to 100C.
Date posted:
June 3, 2019
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Answers (1)
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Chalk is denser than air. Explain why chalk dust floats in air.
(Solved)
Chalk is denser than air. Explain why chalk dust floats in air.
Date posted:
June 3, 2019
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Answers (1)
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The barometric height in a town is 65cmHg. Given that the standard atmospheric pressure is 76cmHg and the density of mercy is 13600kg/m³, determine the...
(Solved)
The barometric height in a town is 65cmHg. Given that the standard atmospheric pressure is 76cmHg and the density of mercy is 13600kg/m³, determine the attitude of the town. (Density of air is 1.25kg/m³).
Date posted:
June 3, 2019
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Answers (1)
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A burette has an initial reading of 22.5cm³. Determine the final reading after liquid of volume of 11.3cm³. To removal from the burette.
(Solved)
A burette has an initial reading of 22.5cm³. Determine the final reading after liquid of volume of 11.3cm³. To removal from the burette.
Date posted:
June 3, 2019
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Answers (1)
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The Y-gain of a Cathode Ray Oscilloscope (C.R.O.) is set at 5 volts per division. A 20Vd.c. input is applied to the Y-plates and causes...
(Solved)
The Y-gain of a Cathode Ray Oscilloscope (C.R.O.) is set at 5 volts per division. A 20Vd.c. input is applied to the Y-plates and causes a deflection of the bright spot on the screen. Show on the screen below the new position of the bright spot.
Date posted:
June 3, 2019
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Answers (1)
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Describe how cathode rays are produced in a cathode ray oscilloscope.
(Solved)
Describe how cathode rays are produced in a cathode ray oscilloscope.
Date posted:
June 3, 2019
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Answers (1)
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Plane water wavefronts are incident onto a concave barrier as shown in the figure below.Show on the same diagram the nature of the reflected wavefronts.
(Solved)
Plane water wavefronts are incident onto a concave barrier as shown in the figure below.
Show on the same diagram the nature of the reflected wavefronts.
Date posted:
June 3, 2019
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Answers (1)
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A vibrator is used to generate water waves in a ripple tank. It is observed that the distance between the first crest and the mid-point...
(Solved)
A vibrator is used to generate water waves in a ripple tank. It is observed that the distance between the first crest and the mid-point to the fifth trough is 237.5cm.
The waves travel 224.0cm in 6.0 seconds.
Determine:
(i) the wavelength of the waves.
(ii) the speed of the waves.
(iii) the frequency of the vibrator.
Date posted:
June 3, 2019
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Answers (1)
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The figure below shows water wave fronts approaching a boundary between a shallow and a deep region. The
speed of waves in the shallow region is...
(Solved)
The figure below shows water wave fronts approaching a boundary between a shallow and a deep region. The
speed of waves in the shallow region is less than in the deep region.
On the same diagram, complete the figure to show the wavefronts after crossing the boundary.
Date posted:
June 3, 2019
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Answers (1)
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The figure below shows a parabolic surface with a source of light placed at its focal point F.
Draw rays to show reflection from the surface...
(Solved)
The figure below shows a parabolic surface with a source of light placed at its focal point F.
Draw rays to show reflection from the surface when rays from the source strike the surface at points A, B, C and D.
Date posted:
June 3, 2019
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Answers (1)
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An immersion heater rated 2.5KW is used in a home continuously for 50 minutes per day in a month of 30 days. Given that electricity...
(Solved)
An immersion heater rated 2.5KW is used in a home continuously for 50 minutes per day in a month of 30 days. Given that electricity costs Kshs.7.60 per unit (1 unit = 1kwh)), calculate:
(i) the number of KW transformed in the month.
(ii) the number of units (kwh) consumed in the month.
(iii) the total cost of the electric power consumed in the month given that there is a fixed charge of Kshs.150.00.
Date posted:
June 3, 2019
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Answers (1)
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The north pole of a magnet is moved away from a metallic ring, as shown in the figure below. Show the direction of current induced...
(Solved)
The north pole of a magnet is moved away from a metallic ring, as shown in the figure below. Show the direction of current induced in the ring.
Date posted:
June 3, 2019
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Answers (1)
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A sample of Iodine-131 contains 1000g. If the half-life of Iodine-131 is 8 days, how much of the sample will remain undecayed after 40 days?
(Solved)
A sample of Iodine-131 contains 1000g. If the half-life of Iodine-131 is 8 days, how much of the sample will remain undecayed after 40 days?
Date posted:
June 3, 2019
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Answers (1)