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
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Date posted: November 12, 2017. Answers (1)
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(a) State one similarity and one difference between a concave lens and a convex mirror
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Date posted: November 12, 2017. Answers (1)
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Date posted: November 12, 2017. Answers (1)
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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.
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Date posted: November 12, 2017. Answers (1)
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Date posted: November 12, 2017. Answers (1)
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Date posted: November 12, 2017. Answers (1)
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Date posted: November 12, 2017. Answers (1)
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Date posted: November 8, 2017. Answers (1)
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Date posted: November 8, 2017. Answers (1)
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Date posted: November 8, 2017. Answers (1)
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Date posted: November 6, 2017. Answers (1)
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(a) What is meant by specific latent heat of fusion of a substance?
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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.
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Date posted: November 2, 2017. Answers (1)
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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)
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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)