the sum of clockwise and anti-clockwise moments should be eqaul
joseph rimiru answered the question on October 28, 2017 at 09:23
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Explain why water stored in an earthen jar becomes cooler than the one which is stored in a metallic jar.
Date posted: October 27, 2017. Answers (1)
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State and explain the effect of decrease in temperature on the surface tension.
Date posted: October 27, 2017. Answers (1)
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A spring extends by 2cm when a mass of 50g is hanged on it. What force is required to extend it by 2.5cm?
Date posted: October 27, 2017. Answers (1)
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Why is the scald from steam more hurting than that of boiling water?
Date posted: October 27, 2017. Answers (1)
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A driving gear wheel having 25 teeth engages with a second wheel with 100 teeth. If the gear system is 85% efficient, find the mechanical advantage.
Date posted: October 27, 2017. Answers (2)
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Date posted: October 27, 2017. Answers (1)
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Describe how microwaves are used in determining distances of objects as in the radar
Date posted: October 27, 2017. Answers (1)
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The element of an electric hot plate has a resistance of 80Ohms. What is the energy dissipated when the element is kept on for 20 minutes on a 240V supply
Date posted: October 27, 2017. Answers (1)
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A student stands at a distance 400m from a wall and claps two pieces of wood. After the first clap the student claps whenever an echo is heard from the wall. Another student starts a stopwatch at the first clap and stops it after the twentieth clap. The stopwatch records a time of 50 seconds. Find the speed of sound.
Date posted: October 27, 2017. Answers (1)
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Use the domain theory to explain how an unmagnetized piece of iron becomes magnetized when it is heated and then allowed to cool in a magnetized field.
Date posted: October 27, 2017. Answers (1)
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Explain why the e.m.f of a dry cell drops if a large current is drawn for a short time and then recovers if allowed to rest.
Date posted: October 27, 2017. Answers (1)
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A negatively charged rod is brought rear the cap of a leaf electroscope. The cap is then earthed momentarily by touching with the finger. Finally the rod is withdrawn. The electroscope is found to be positively charged. Explain how this is acquired
Date posted: October 27, 2017. Answers (1)
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State any one form of energy
b) An electric crane lifts a load of 2000kg through a vertical distance of 3.0m in 6 seconds Determine:
i) The work done
ii) The power developed by the crane
The efficiency of the crane if it is operated by an electric motor rated 12.5kw.
Date posted: October 27, 2017. Answers (1)
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When ice is heated, the temperature remains constant until all ice is melted. Explain this observation.
Date posted: October 27, 2017. Answers (1)
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Using the kinetic theory of gases, explain why air inside a tyre exerts pressure on the walls of the tyre
Date posted: October 27, 2017. Answers (1)
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State two advantages of a force pump over lift pump
Date posted: October 27, 2017. Answers (1)
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A box made of glass sides contained a mixture of smoke and air. Bright light was shown on it and viewed through a microscope. It is observed that the small bright specks are seen to be moving randomly.
a. What are the bright specks?
b. What cause their movement?
c. If the mixture of smoke and air was cooled, what change or changes would be there in the motion of the specks?
Date posted: October 26, 2017. Answers (1)
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The smell of rotten eggs broken in a room spread throughout the room. Explain.
Date posted: October 26, 2017. Answers (1)
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Diffusion support the idea that matter is made up of small particles. Explain.
Date posted: October 26, 2017. Answers (1)
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Some pollen grains were placed in water, explain how their motion supports the idea that matter is in continuous state of motion.
Date posted: October 26, 2017. Answers (1)