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The spiral springs shown in the figure below are identical. Each spring has a constant K = 300N/m.
Determine the extension caused by the 150N weight...
(Solved)
The spiral springs shown in the figure below are identical. Each spring has a constant K = 300N/m.
Determine the extension caused by the 150N weight (Ignore weight of springs and connecting rods)
Date posted:
September 6, 2019
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Answers (1)
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A micrometer screw gauge has a zero error of -0.02mm. It is used to measure the diameter of a wire. If the actual diameter of...
(Solved)
A micrometer screw gauge has a zero error of -0.02mm. It is used to measure the diameter of a wire. If the actual diameter of the wire is 0.28mm. Draw the micrometer screw gauge showing the diameter of the wire.
Date posted:
September 6, 2019
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Answers (1)
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Sodium has a work function of 2.3eV. Given that: Planck’s constant h = 6.63 x 10-34JS, velocity of light in vacuum, C = 3.0 x108m/s,...
(Solved)
Sodium has a work function of 2.3eV. Given that: Planck’s constant h = 6.63 x 10-34JS, velocity of light in vacuum, C = 3.0 x108m/s, 1 electron-volt (1eV) = 1.6 x 10-19 C and mass of an electron, me = 9.1 x 10-31kg, calculate:
(i) Its threshold frequency.
(ii) The maximum velocity of the photoelectrons produced when the sodium is illuminated by light of wavelength 5.0 x 10-7m.
(iii) The stopping potential V, with the light of this wavelength.
Date posted:
August 22, 2019
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Answers (1)
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A house has a lighting circuit operated from a 240V mains supply. Four bulbs rated 40W 240V and six bulbs rated 100W 240V are switched...
(Solved)
A house has a lighting circuit operated from a 240V mains supply. Four bulbs rated 40W 240V and six bulbs rated 100W 240V are switched on for 5 hours a day. Determine the monthly bill for the consumer given that the cost of electricity is at shs. 5.50 per unit.
(Take 1 month = 30 days and the standing charge is sh. 150)
Date posted:
August 22, 2019
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Answers (1)
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The figure below shows refraction of light at air-water interface.
(Solved)
The figure below shows refraction of light at air-water interface.
Determine angle Ө if the refractive index of water is 1.33
Date posted:
August 22, 2019
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Answers (1)
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The diagram in the figure below represents a wheel and axle used as a machine, whose efficiency is 80% to raise 400N of building materials....
(Solved)
The diagram in the figure below represents a wheel and axle used as a machine, whose efficiency is 80% to raise 400N of building materials. The wheel and axle have diameters of 75cm and 15cm respectively.
(i) Mark on the diagram the correct position and direction of the load to be lifted.
(ii) Name the principle on which this machine works.
(iii) Calculate the effort needed to raise the load.
(iv) The machine is operated manually and raises the load to a height of 5m in 20 seconds. Calculate the power developed by the operator
Date posted:
August 22, 2019
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Answers (1)
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A simple hydrometer is set up with a test –tube of mass 10g and length 12cm with a flat base and partially filled with lead...
(Solved)
A simple hydrometer is set up with a test –tube of mass 10g and length 12cm with a flat base and partially filled with lead shots. The test – tube has a uniform cross – sectional area of 2.0cm2 and 10cm of its length is under water as shown in the figure below.
(i) Determine the mass of lead shots in the test – tube (Take density of water = 1000kgm-3)
(ii) Calculate the mass of the lead shots to be added if the test – tube has to displace an equal volume of a liquid of density 1.25gcm-3.
(iii) What is the function of the lead shots?
Date posted:
August 22, 2019
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Answers (1)
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A light spring that obeys Hooke’s law was attached to a fixed support. When a load of 10N was hung on it, the length of the...
(Solved)
A light spring that obeys Hooke’s law was attached to a fixed support. When a load of 10N was hung on it, the length of the spring was 320mm and when a 20N load was hung on it, the length became 400mm. Determine:
(i) The length of the spring when it has no load on it
(ii) The length of the spring when it has a load of 16N.
Date posted:
August 22, 2019
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Answers (1)
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The figure below shows two graphs for two different springs A and B
(Solved)
The figure below shows two graphs for two different springs A and B
F1 and F2 are points at which the springs break.
Determine and explain which of the two springs:
(i) Obeys Hooke’s law
(ii) Is stronger
Date posted:
August 22, 2019
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Answers (1)
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The diagram below shows a pendulum bob swinging freely to and from.
(Solved)
The diagram below shows a pendulum bob swinging freely to and from.
Determine the maximum velocity of the ball at B if the maximum horizontal displacement of the ball is 10cm.
Date posted:
August 22, 2019
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Answers (1)
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The graph shows variation of extension and stretching force F for a spring which obeys Hooke’s law.
(i) Determine the spring constant in SI units .
(ii)...
(Solved)
The graph shows variation of extension and stretching force F for a spring which obeys Hooke’s law.
(i) Determine the spring constant in SI units .
(ii) The energy stored when the extension is 20 cm.
Date posted:
August 6, 2019
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Answers (1)
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Explain why when graduating the upper fixed point of a thermometer; the bulb is put in steam
above boiling water and not boiling water.
(Solved)
Explain why when graduating the upper fixed point of a thermometer; the bulb is put in steam
above boiling water and not boiling water.
Date posted:
August 6, 2019
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Answers (1)
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The figure below shows a soap film formed on a metal ring and a loop of thread inside it.
(i) Explain what will happen when the...
(Solved)
The figure below shows a soap film formed on a metal ring and a loop of thread inside it.
(i) Explain what will happen when the film is punctured by a needle at X.
(ii) What is the name given to the force acting on the thread?
Date posted:
August 6, 2019
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Answers (1)
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A 5µF capacitor is charged to a potential difference of 200V and isolated. It is then connected
to a 10µF capacitor.Find
(i) The resultant potential difference across...
(Solved)
A 5μF capacitor is charged to a potential difference of 200V and isolated. It is then connected
to a 10μF capacitor.Find
(i) The resultant potential difference across the combination
(ii) Energy stored before connection
(iii) Total energy in the capacitors after connection
Date posted:
August 6, 2019
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Answers (1)
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When the switch S is kept open in the circuit shown below the voltmeter reads 1.5V. When the switch is closed, the readings drops to...
(Solved)
When the switch S is kept open in the circuit shown below the voltmeter reads 1.5V. When the switch is closed, the readings drops to 1.3V and the current through the resistor is 0.5A.
(i) What is the e.m.f of the cell?
(ii) What the terminal voltage of the cell?
(iii) Calculate the value of R.
Date posted:
August 6, 2019
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Answers (1)
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State two quantities that are used to determine whether accumulator require recharging or not.
(Solved)
State two quantities that are used to determine whether accumulator require recharging or not.
Date posted:
August 6, 2019
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Answers (1)
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Explain why soft iron keepers are suitable for storing magnets.
(Solved)
Explain why soft iron keepers are suitable for storing magnets.
Date posted:
August 6, 2019
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Answers (1)
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Explain why it is easier to loosen a tight nut using a spanner with long handle
(Solved)
Explain why it is easier to loosen a tight nut using a spanner with long handle
Date posted:
June 8, 2019
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Answers (1)
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The Figure below shows a velocity-time graph for a steel ball falling
through a viscous fluid.
Explain the nature of the curve in;
(i) section PQ.
(ii) section QR.
(iii)...
(Solved)
The Figure below shows a velocity-time graph for a steel ball falling
through a viscous fluid.
Explain the nature of the curve in;
(i) section PQ.
(ii) section QR.
(iii) If the graph shown above is of a ball falling through water, sketch on the same axis a graph for the ball falling through glycerine.
Date posted:
June 4, 2019
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Answers (1)
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The Figure 11 below shows a hydraulic lift supporting a load of 150kg. Its cross-sectional areas A1 and A2 are 0.02m2 and 0.4m2 respectively. The...
(Solved)
The Figure 11 below shows a hydraulic lift supporting a load of 150kg. Its cross-sectional areas A1 and A2 are 0.02m2 and 0.4m2 respectively. The length of the effort arm is 1m and the length of the plunger from the pivot is 0.4m.
Determine:
(i) the pressure exerted by 150kg mass.
(ii) the pressure exerted by F1 on the smaller piston.
(iii) the force F1.
(iv) the applied force, Fe.
(v) the mechanical advantage.
(vi) the velocity ratio of the system.
(v) the efficiency of the system.
Date posted:
June 4, 2019
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Answers (1)