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a.c voltage can be stepped up or down by a transformer as opposed to a d.c voltages;
gideon1 answered the question on November 12, 2017 at 16:48
- State one difference between a chemical reaction and radioactivity.(Solved)
State one difference between a chemical reaction and radioactivity.
Date posted: November 12, 2017. Answers (1)
- State the conditions necessary for a wave incident on a slit to be diffracted(Solved)
State the conditions necessary for a wave incident on a slit to be diffracted
Date posted: November 12, 2017. Answers (1)
- (a) State one similarity and one difference between a concave lens and a convex mirror (b) A lens forms a focused image on a screen...(Solved)
(a) State one similarity and one difference between a concave lens and a convex mirror
(b) A lens forms a focused image on a screen when the distance between the object and the lens is 100 cm. the size of the image is twice that of the object.
(i) What kind of lens was used? Give a reason
(ii) Determine the distance of the image from the lens
(iii) Determine the power of the lens
Date posted: November 12, 2017. Answers (1)
- Differentiate between Faradays law of electromagnetic induction and Lenz law.(Solved)
Differentiate between Faradays law of electromagnetic induction and Lenz law.
Date posted: November 12, 2017. Answers (1)
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Describe how you would charge a gold leaf electroscope by induction method
Date posted: November 12, 2017. Answers (1)
- Sauce pans have a plastic or wooden handles. It is observed that in the morning the pan feels colder than the wooden handle.
Explain the...(Solved)
Sauce pans have a plastic or wooden handles. It is observed that in the morning the pan feels colder than the wooden handle.
Explain the difference in this observation
Date posted: November 12, 2017. Answers (1)
- Trees planted along a busy road are observed to lean towards the road as they grow. Explain this observation(Solved)
Trees planted along a busy road are observed to lean towards the road as they grow. Explain this observation.
Date posted: November 12, 2017. Answers (1)
- Explain why copper is a better conductor of heat than iron(Solved)
Explain why copper is a better conductor of heat than iron
Date posted: November 12, 2017. Answers (1)
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Explain the reason why a dropping dust particle in a still room does not trace a straight vertical path
Date posted: November 12, 2017. Answers (1)
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Explain briefly how a p-type semiconductor is made
Date posted: November 12, 2017. Answers (1)
- What is Physics?(Solved)
What is Physics?
Date posted: November 10, 2017. Answers (1)
- A negatively charged polythene rod is placed on a pan of electric balance. State and explain what happens to the balance reading if a positively...(Solved)
A negatively charged polythene rod is placed on a pan of electric balance. State and explain what happens to the balance reading if a positively charged glass rod is brought closer to the polythene rod.
Date posted: November 8, 2017. Answers (1)
- State three factors that affect the proportionality constant of a helical spring(Solved)
State three factors that affect the proportionality constant of a helical spring
Date posted: November 8, 2017. Answers (1)
- State two characteristics of perfectly inelastic collisions(Solved)
State two characteristics of perfectly inelastic collisions
Date posted: November 8, 2017. Answers (1)
- In a clinical thermometer state how the thermometer can be made. (a) Move sensitive (b) Quick acting(Solved)
In a clinical thermometer state how the thermometer can be made.
(a) Move sensitive
(b) Quick acting
Date posted: November 8, 2017. Answers (1)
- State one way through which power loss in a transformer takes place.(Solved)
State one way through which power loss in a transformer takes place.
Date posted: November 6, 2017. Answers (1)
- Explain how impurities lower surface tension force(Solved)
Explain how impurities lower surface tension force
Date posted: November 3, 2017. Answers (1)
- (a) What is meant by specific latent heat of fusion of a substance? (b) In an experiment to determine the specific latent heat of vaporization...(Solved)
(a) What is meant by specific latent heat of fusion of a substance?
(b) In an experiment to determine the specific latent heat of vaporization of water, steam at 100ºC was passed into water
contained in a well-lagged copper calorimeter. The following measurements were made:
? Mass of calorimeter = 60g
? mass of water + calorimeter = 145g
? Final mass of calorimeter + water + condensed steam = 156g
? Final temperature of the mixture = 48oC
[Specific heat capacity of water = 4200JKg¯¹k¯¹ and specific heat capacity of copper = 390JKg¯¹k¯¹]
Determine the;
(i) mass of condensed steam.
(ii) The heat gained by the water and calorimeter if the initial temperature of the calorimeter and water is 20ºC.
(iii) Given that Lvis the specific latent heat of vaporization of steam, write an expression for the heat given out by steam.
(iv) Determine the value of Lv above (2marks)
(v) State the assumption made in the above experiment
Date posted: November 2, 2017. Answers (1)
- A bullet of mass 24g travelling in a horizontal path with a velocity of 450ms-1
strikes a wooden block of wood of mass 976g
resting...(Solved)
A bullet of mass 24g travelling in a horizontal path with a velocity of 450ms-1
strikes a wooden block of wood of mass 976g
resting on a rough horizontal surface. After impact, the bullet and the block move together for a distance of 7.5m before
coming rest.
(a) Name the type of collision which takes place above (1 mark)
(b) What‘s the velocity of the two bodies when they start sliding (2 marks)
(c) Calculate the force which brings the two bodies to rest (3 marks)
(d) Determine the coefficient of friction between the block and the surface during this motion
Date posted: November 2, 2017. Answers (1)
- State what happens to the image when one moves closer to the object when using a pinhole camera.(Solved)
State what happens to the image when one moves closer to the object when using a pinhole camera.
Date posted: November 2, 2017. Answers (1)