Alcohol measures as low temperatures as -115°C while mercury is on -39°C.
sharon kalunda answered the question on May 31, 2019 at 05:35
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The figure below shows a car braking system. The brake fluid is an oily liquid.
The brake drum rotates with the wheel of the car.
(i) Explain...
(Solved)
The figure below shows a car braking system. The brake fluid is an oily liquid.
The brake drum rotates with the wheel of the car.
(i) Explain how pushing the brake pedal makes the brake rub against the drum.
(ii) The cross-sectional area of the master piston is 2.0cm2. A force of 140N is applied to the master piston.
(I) Calculate the pressure created in the brake fluid by the master piston.
(II) The cross-sectional area of each slave piston is 2.8cm2. Calculate the force exerted on each slave piston by the brake fluid.
(III) The force exerted on the master piston is greater than the force applied by the foot on the brake pedal. Using the principle of moments, explain this
Date posted:
May 31, 2019
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Answers (1)
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The figure below shows two containers filled with two different liquids to the same height.
It was found that the pressure at the bottom of A...
(Solved)
The figure below shows two containers filled with two different liquids to the same height.
It was found that the pressure at the bottom of A is greater than that at B. Explain
Date posted:
May 31, 2019
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Answers (1)
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A rubber tube is inflated to pressure of 2.7 x 105 pa and volume 3800cm3 at temperature of 250C. It is then taken to another...
(Solved)
A rubber tube is inflated to pressure of 2.7 x 105 pa and volume 3800cm3 at temperature of 250C. It is then taken to another place where the temperature is 150C and the pressure is 2.5 x 105 pa. Determine the new volume
Date posted:
May 31, 2019
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Answers (1)
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The figure shows a manometer used to measure the pressure difference between the air inside a plastic container and the atmosphere outside.
Calculate the force F...
(Solved)
The figure shows a manometer used to measure the pressure difference between the air inside a plastic container and the atmosphere outside.
Calculate the force F exerted on the container.
Date posted:
May 31, 2019
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Answers (1)
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The figure below shows a bottle opener.
A force of 30N is applied at a distance of 11cm from the pivot P. The force F on...
(Solved)
The figure below shows a bottle opener.
A force of 30N is applied at a distance of 11cm from the pivot P. The force F on the bottle cap of 1.5cm from the pivot P. Calculate the force F on the edge of the cap.
Date posted:
May 31, 2019
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Answers (1)
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A transformer is designed to supply a current of 12A at a p.d. of 80V. The inlet cable is to be connected to an a.c....
(Solved)
A transformer is designed to supply a current of 12A at a p.d. of 80V. The inlet cable is to be connected to an a.c. mains of
240V. The efficiency of this transformer is 80%.
Calculate
i) Current in the transformer.
ii) The power supplied to the transfer.
Date posted:
May 30, 2019
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Answers (1)
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Explain the term work function of a metal surface, stating how it affect photoelectric emission.
(Solved)
Explain the term work function of a metal surface, stating how it affect photoelectric emission.
Date posted:
May 30, 2019
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Answers (1)
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State one similarity between ultraviolet rays and gamma rays in terms of their dangers.
(Solved)
State one similarity between ultraviolet rays and gamma rays in terms of their dangers.
Date posted:
May 30, 2019
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Answers (1)
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A 2kW electric heater is used for 10 hrs. Calculate the cost of electricity if its costs Kshs 30 per unit.
(Solved)
A 2kW electric heater is used for 10 hrs. Calculate the cost of electricity if its costs Kshs 30 per unit.
Date posted:
May 30, 2019
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Answers (1)
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A heater is rated 3kW, 240V. The fuses available are marked 10A, 13A and 20A. Which fuse is most suitable?
(Solved)
A heater is rated 3kW, 240V. The fuses available are marked 10A, 13A and 20A. Which fuse is most suitable?
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows a pin 60mm long placed a long the principal axis of a lens of focal length 50mm. The near end of...
(Solved)
The figure below shows a pin 60mm long placed a long the principal axis of a lens of focal length 50mm. The near end of the pin is 80mm form the lens.
Determine the length of the image.
Date posted:
May 30, 2019
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Answers (1)
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How many electric iron boxes rated 1000W could be safely connected to a 240V mains circuit fitted with a 13A fuse?
(Solved)
How many electric iron boxes rated 1000W could be safely connected to a 240V mains circuit fitted with a 13A fuse?
Date posted:
May 30, 2019
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Answers (1)
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A ferromagnetic material is being magnetised by single stroking method. On the axes provided, sketch a graph to show how
the strength of the magnet being...
(Solved)
A ferromagnetic material is being magnetised by single stroking method. On the axes provided, sketch a graph to show how
the strength of the magnet being created varies with number of strokes.
Date posted:
May 30, 2019
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Answers (1)
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A metal cube weighs 1.0N in air and 0.8N when totally immersed in water.
Calculate
(i) Volume of water it displaces.
(ii) the density of the cube
(Solved)
A metal cube weighs 1.0N in air and 0.8N when totally immersed in water.
Calculate
(i) Volume of water it displaces.
(ii) the density of the cube
Date posted:
May 30, 2019
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Answers (1)
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An object is attached to a spring balance and its weight determined in air. It is then gently lowered into a beaker containing water.
(i) State...
(Solved)
An object is attached to a spring balance and its weight determined in air. It is then gently lowered into a beaker containing water.
(i) State what happens to the reading.
(ii) Explain the force that causes observation in (i) above.
Date posted:
May 30, 2019
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Answers (1)
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A boy on a bicycle accelerated uniformly at 1m/s2 for 10 seconds from an initial velocity of 4m/s. Calculate the distance travelled in this time.
(Solved)
A boy on a bicycle accelerated uniformly at 1m/s2 for 10 seconds from an initial velocity of 4m/s. Calculate the distance travelled in this time.
Date posted:
May 30, 2019
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Answers (1)
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Carbon dioxide is used to make fizzy drinks. It is stored in high pressure in cast iron cylinder. The figure below represents the
particles in a...
(Solved)
Carbon dioxide is used to make fizzy drinks. It is stored in high pressure in cast iron cylinder. The figure below represents the
particles in a cylinder of carbon dioxide.
Describe how particles of carbon dioxide exert pressure.
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows a funnel dipped into a liquid soap solution.
Explain what happens to the soap bubble when the soap is removed.
(Solved)
The figure below shows a funnel dipped into a liquid soap solution.
Explain what happens to the soap bubble when the soap is removed.
Date posted:
May 30, 2019
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Answers (1)
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A solid displaces 8.5cm³ of liquid when floating on a certain liquid and 11.5cm³ when fully submerged with liquid. The
density of solid in 0.8g/cm³, determine:-
i)...
(Solved)
A solid displaces 8.5cm³ of liquid when floating on a certain liquid and 11.5cm³ when fully submerged with liquid. The
density of solid in 0.8g/cm³, determine:-
i) Upthrust on the solid when floating.
ii) Density of the liquid.
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows an empty beaker placed on the top of a pan calibrated in grammes. 50ml of alcohol of density 0.8g/cm3 was added...
(Solved)
The figure below shows an empty beaker placed on the top of a pan calibrated in grammes. 50ml of alcohol of density 0.8g/cm3 was added to the beaker.
Show on the figure the new pointer position.
Date posted:
May 30, 2019
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Answers (1)