Fast moving air at the top of tube reduces the pressure. The atmospheric pressure which is greater than the reduced pressure causes the water to rise up the tube.
sharon kalunda answered the question on May 31, 2019 at 06:06
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An external force applied to a ball of mass 160g increases its velocity from 25cm/s to 275cm/s in 10 seconds. Calculate the
force applied.
(Solved)
An external force applied to a ball of mass 160g increases its velocity from 25cm/s to 275cm/s in 10 seconds. Calculate the
force applied.
Date posted:
May 31, 2019
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Answers (1)
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Two equal masses travel towards each other on a frictionless air track at speeds of 60cm/s and 40cm /s. They stick together on impact.
What is...
(Solved)
Two equal masses travel towards each other on a frictionless air track at speeds of 60cm/s and 40cm /s. They stick together on impact.
What is the velocity of the masses after impact?
Date posted:
May 31, 2019
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Answers (1)
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The figure below shows a solid cone standing on a horizontal surface. The cone is in unstable equilibrium.
On the horizontal space provided, sketch the cone...
(Solved)
The figure below shows a solid cone standing on a horizontal surface. The cone is in unstable equilibrium.
On the horizontal space provided, sketch the cone in neutral equilibrium.
Date posted:
May 31, 2019
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Answers (1)
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A jet fighter moving horizontally at a speed of 200m/s at a height of 2km above the ground is to drop a bomb to hit...
(Solved)
A jet fighter moving horizontally at a speed of 200m/s at a height of 2km above the ground is to drop a bomb to hit a target on the ground. How long does the bomb stay in air after release before it hit the target?
Date posted:
May 31, 2019
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Answers (1)
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The figure below shows a uniform rule AB of length 1.0m and weight 1.2N. The system is in equilibrium.
Determine the weight of X.
(Solved)
The figure below shows a uniform rule AB of length 1.0m and weight 1.2N. The system is in equilibrium.
Determine the weight of X.
Date posted:
May 31, 2019
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Answers (1)
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The graph below shows the variation of force with distance for a body being towed.
Calculate the total work done on the body.
(Solved)
The graph below shows the variation of force with distance for a body being towed.
Calculate the total work done on the body.
Date posted:
May 31, 2019
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Answers (1)
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Two gear wheel have a 80 teeth (driven) and 20 teeth (driving) and lock with each other. They are fastened on axles of
equal diameters such...
(Solved)
Two gear wheel have a 80 teeth (driven) and 20 teeth (driving) and lock with each other. They are fastened on axles of
equal diameters such that a weight of 150N attached to a string round one axle will just raise 450N on the other axle.
Calculate
(i) M.A
(ii) V.R
(iii) Efficiency of the machine.
Date posted:
May 31, 2019
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Answers (1)
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What is a machine?
(Solved)
What is a machine?
Date posted:
May 31, 2019
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Answers (1)
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The figure below shows a master cylinder sealed at one end. Instead of brake fluid, the cylinder contains air.
When a force is applied to the...
(Solved)
The figure below shows a master cylinder sealed at one end. Instead of brake fluid, the cylinder contains air.
When a force is applied to the piston, the length d changes from 6.0cm to 4.0cm. The pressure of the air increases but the temperature stays constant.
(i) Describe how the molecules of air exert a pressure.
(ii) Explain why the pressure increases even though the temperature stays constant.
(iii) The initial pressure of the air inside the cylinder is 1.0 x 105 pa. Calculate the final pressure of the air.
Date posted:
May 31, 2019
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Answers (1)
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State one advantage of alcohol thermometer over mercury thermometer.
(Solved)
State one advantage of alcohol thermometer over mercury thermometer.
Date posted:
May 31, 2019
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Answers (1)
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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)