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A driving gear having 25teeth engages with a second gear with 20teeth. A third gear with 30 teeth on the
same shaft as the second one engages with a fourth gear having 60teeth. Find:
a) The total velocity ratio of the system.
b) The mechanical advantage of the system if its efficiency is 85%.
Date posted:
April 9, 2018
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A man uses an inclined plane to lift a 81kg mass through a vertical height of 1.0m. Given that the angle of
inclination of the plane is 300 and its efficiency is 75%, determine:
a) The effort needed to move the load up the inclined plane at a constant velocity.
b) The workdone against friction in raising the mass through the height of 1.0m.
Date posted:
April 9, 2018
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A machine whose velocity ratio is 8 is used to lift a load of 300N. The effort required is 60N. calculate:
a) The mechanical advantage of the machine.
b) The efficiency of the machine.
Date posted:
April 9, 2018
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An effort of 250N raises a load of 900N through 5m in a machine. If the effort moves through 25m, find:
a) The useful workdone in raising the load.
b) The workdone by the effort.
c) The efficiency of the machine.
Date posted:
April 9, 2018
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A machine requires 6000J of energy to lift a mass of 55kg through a vertical distance of 8m. Calculate its efficiency.
Date posted:
April 9, 2018
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A body of mass 12kg is pulled from the rest with a constant force of 25N. The force is applied for 5.0s.
Calculate:
a) The distance travelled
b) Workdone on the body.
c) The final kinetic energy of the body.
d) The final velocity of the body.
Date posted:
April 9, 2018
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A crane is used to lift a body of mass 30kg through a vertical distance of 5.0m.
a) How much work is done on the body?
b) What is the potential energy stored in the body?
c) Comment on the two answers above.
Date posted:
April 9, 2018
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A force of 40N is applied on a body. The body moves a horizontal distance of 7m. Calculate the work done
on the body.
Date posted:
April 9, 2018
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Explain advantages of modern means of communication.
Date posted:
April 9, 2018
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Factors to consider when selecting and teaching new song for pre-school children.
Date posted:
April 9, 2018
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Explain why a magnetic material is attracted by a magnet
Date posted:
April 9, 2018
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Explain five social effects of the Uganda railway on Kenya during the colonial period
Date posted:
April 9, 2018
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Explain the meaning of 'automatic recalculation' as used in a spreadsheet.
Date posted:
April 9, 2018
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Give the advantages of electronic spreadsheet over the traditional ledger book.
Date posted:
April 9, 2018
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Eleza umuhimu wa hadithi.
Date posted:
April 9, 2018
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Explain the meaning of 'Print Layout/ Page Layout view'.
Date posted:
April 9, 2018
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A bullet of mass 2g travelling horizontally at 20m/s embeds itself in a block of wood of mass 990g
suspended from a light inextensible string so that it can swing freely. Find:
The velocity of the bullet and block immediately after collision.
Date posted:
April 9, 2018
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A bullet of mass 20g is shot from a gun of mass 20kg with a muzzle velocity of 200m/s. if the bullet is
30cm long, determine:
a) The acceleration of the bullet.
b) The recoil velocity of the gun.
Date posted:
April 9, 2018
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Explain the meaning of 'Normal view' in Microsoft word document.
Date posted:
April 9, 2018
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A car of mass 1500kg is brought to rest from a velocity of 25m/s by a constant force of 3000N. Determine
the change in momentum produced by the force and the time it takes the car to come to rest.
Date posted:
April 9, 2018
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The volumes of 2 similar solid cones are 1080 cubic centimeters and 1715 cubic centimeters. If the curved surface area of the smaller cone is 840 square centimeters, find the curved surface area of the larger cone.
Date posted:
April 9, 2018
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Explain why the bristles of a paint brush cling together when removed from water in a bucket.
Date posted:
April 9, 2018
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Maudhui ya elimu katika Kidagaa.
Date posted:
April 8, 2018
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A ball of mass 35g travelling horizontally at 20m/s strikes a barrier normally and rebounds with a speed
of 3m/s. Find the impulse exerted on the ball.
Date posted:
April 8, 2018
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A body moves 30m due east in 2seconds, then 40m due north in 4seconds. Determine its:
a) Average speed.
Date posted:
April 8, 2018
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Explain why in water the meniscus in the capillary tube is higher than in the beaker while in the mercury, the meniscus in the capillary tube is lower than in the beaker.
Date posted:
April 8, 2018
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State the dangers of Bernoulli’s effect
Date posted:
April 8, 2018
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Explain the applications of Bernoulli’s principle
Date posted:
April 8, 2018
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Lessons learnt from the healing of the centurion's servant
Date posted:
April 8, 2018
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Explain the factors affecting speed of sound in air
Date posted:
April 8, 2018