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The figure below shows a path taken by a gas molecule moving from point x to z
(Solved)
The figure below shows a path taken by a gas molecule moving from point x to z
(a) Explain how this movement can be observed
(b) State in full, the law of motion that governs movement from x to z
Date posted:
October 1, 2019
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Answers (1)
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The machine represented in the diagram can be used to lift water from a well.
(Solved)
The machine represented in the diagram can be used to lift water from a well.
A force of 50N applied on the handle lifts water of weight 180N
i) Calculate the efficiency of the machine.
ii) Give a reason why the efficiency is less than 100%.
Date posted:
September 30, 2019
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Answers (1)
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A block of metal of mass 250g at 100°C is dropped into a lagged calorimeter of heat capacity 40J/K containing 100g of water at 25°C....
(Solved)
A block of metal of mass 250g at 100°C is dropped into a lagged calorimeter of heat capacity 40J/K containing 100g of water at 25°C. The temperature of the resulting mixture was found to be 40°C. Determine; (Cw = 4200J/k)
i) Heat gained by calorimeter.
ii) Heat gained by water.
iii) Heat lost by the block.
iv) Specific heat capacity of the metal block.
Date posted:
September 30, 2019
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Answers (1)
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In an experiment, it was observed that soapy water placed on a wet smooth surface displaced the particles of non-soapy water. Sate and explain this...
(Solved)
In an experiment, it was observed that soapy water placed on a wet smooth surface displaced the particles of non-soapy water. Sate and explain this observation.
Date posted:
September 30, 2019
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Answers (1)
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Give one reason why a lift pump raises water to heights less than 10m.
(Solved)
Give one reason why a lift pump raises water to heights less than 10m.
Date posted:
September 30, 2019
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Answers (1)
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A mass of 80kg is being lifted by a force F applied on the other piston of the machine as shown in the figure...
(Solved)
A mass of 80kg is being lifted by a force F applied on the other piston of the machine as shown in the figure below.Determine the value of F needed to just lift the 80kg mass given the density of the liquid is 1.2g/cm³.
Date posted:
September 30, 2019
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Answers (1)
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State the contribution physics has made to the entertainment industry.
(Solved)
State the contribution physics has made to the entertainment industry.
Date posted:
September 30, 2019
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Answers (1)
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The figure below shows a uniform bar of weight 5N and length 1.1m pivoted at a point and in equilibrium under the action of the...
(Solved)
The figure below shows a uniform bar of weight 5N and length 1.1m pivoted at a point and in equilibrium under the action of the forces shown.
Determine the value of weight W.
Date posted:
September 30, 2019
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Answers (1)
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The water level in a burette is 30.6cm³, 50 drops of water each of volume 0.2cm³ are added to the water in the burette. What...
(Solved)
The water level in a burette is 30.6cm³, 50 drops of water each of volume 0.2cm³ are added to the water in the burette. What is the final reading of the burette.
Date posted:
September 30, 2019
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Answers (1)
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A transformer with 1200 turns in the primary circuit and 120 turns in the secondary circuit has its primary circuit connected to a 400V a.c....
(Solved)
A transformer with 1200 turns in the primary circuit and 120 turns in the secondary circuit has its primary circuit connected to a 400V a.c. source. It is found that when a heater is connected to the secondary circuit, it produces heat at the rate of 600W. Assuming 100% efficiency, determine the:
i) voltage in the secondary circuit.
ii) current in the primary circuit.
iii) current in the secondary circuit.
Date posted:
September 30, 2019
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Answers (1)
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The cost of electricity per kilowatt hour- kWh is Ksh.8, determines how much a household running a device rated 1500W continuously for 1.08 x 105...
(Solved)
The cost of electricity per kilowatt hour- kWh is Ksh.8, determines how much a household running a device rated 1500W continuously for 1.08 x 105 seconds, would pay.
Date posted:
September 30, 2019
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Answers (1)
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Diagram below represents a metre bridge used to determine the resistance of an electrical component, X.
(Solved)
Diagram below represents a metre bridge used to determine the resistance of an electrical component, X.
From the diagram,
i) Explain why wide brass strips are used as terminals.
ii) Explain why a cell of low e.m.f is preferable.
iii) If null deflection was obtained when l1 was 60.0cm. Calculate the resistance of component marked X.
iv) State three ways of ensuring that the error is minimized.
Date posted:
September 30, 2019
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Answers (1)
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The figure below shows a plastic bottle having a weighted cork floating on water inside the bottle.When the sides of the bottle are squeezed the...
(Solved)
The figure below shows a plastic bottle having a weighted cork floating on water inside the bottle.When the sides of the bottle are squeezed the cork sinks.
Explain the observation.
Date posted:
September 30, 2019
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Answers (1)
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The figure below shows a screw jack whose pitch is 5mm. If the handle has a length of 40cm and the jack is 80% efficient....
(Solved)
The figure below shows a screw jack whose pitch is 5mm. If the handle has a length of 40cm and the jack is 80% efficient. Determine the effort needed to raise a car of mass 750kg.
Date posted:
September 30, 2019
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Answers (1)
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Sketch a graph of displacement against time for a body moving with uniform deceleration.
(Solved)
Sketch a graph of displacement against time for a body moving with uniform deceleration.
Date posted:
September 30, 2019
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Answers (1)
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The figure below shows a battery of e.m.f 12V and internal resistance of 2 ohms connected to resistors and an ammeter.
(Solved)
The figure below shows a battery of e.m.f 12V and internal resistance of 2 ohms connected to resistors and an ammeter.
i) Determine the ammeter reading when the switch S, is open.
ii) Find the ammeter reading when the switch is closed.
Date posted:
September 30, 2019
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Answers (1)
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In an X-ray tube, the accelerating voltage is 100KV.
(Solved)
In an X-ray tube, the accelerating voltage is 100KV.
i) Calculate the kinetic energy of the electrons arriving at the target (take e = 1.6 x 10-19C)
ii) If 0.5% of the kinetic energy is converted to X-rays, determine the minimum wavelength of the emitted X-rays (take h = 6.63 x 10-34Js and C = 3.0 x 108m/s)
Date posted:
September 30, 2019
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Answers (1)
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A coin is placed at the bottom of a beaker filled with water to a height of 2.4cm as shown in the figure below. Given...
(Solved)
A coin is placed at the bottom of a beaker filled with water to a height of 2.4cm as shown in the figure below. Given that the refractive index of water is 1.33, determine the apparent depth of the coin.
Date posted:
September 30, 2019
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Answers (1)
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A certain car battery is rated 30Ah. Determine the amount of current it can supply in 10 minutes.
(Solved)
A certain car battery is rated 30Ah. Determine the amount of current it can supply in 10 minutes.
Date posted:
September 30, 2019
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Answers (1)
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Give a reason why when a passenger jumps from a floating boat, the boat moves backwards.
(Solved)
Give a reason why when a passenger jumps from a floating boat, the boat moves backwards.
Date posted:
September 30, 2019
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Answers (1)