There is an assumption made in answering this question so as to make it easily understood.
i.e. In the morning, the atmospheric temperatures are lower compared to the atmospheric temperature during the day.
so, the cable being a matter, it is affected by temperature. the rule states that all matter expands with increase in temperature and contracts in decrease in temperature. there being morning, with a lower temperature, the matter (cable) contracts but the distance between the post holding it in place does not reduce, so, it tends to straighten.
Eng melau answered the question on April 25, 2018 at 05:27
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A butcher has a beam balance and only two masses of 3.5kg and 5kg.Explain how he can manage to measure for a customer 1.5kg of...
(Solved)
A butcher has a beam balance and only two masses of 3.5kg and 5kg.Explain how he can manage to measure for a customer 1.5kg of meat at once using only the two masses
Date posted:
April 23, 2018
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Answers (1)
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A tin containing 5000cm3 of paint has a Mass of 70kg.a)If the mass of the empty tin,including the lid,is 0.5kg,calculate the density of the paint
(Solved)
A tin containing 5000cm3 of paint has a Mass of 70kg.a)If the mass of the empty tin,including the lid,is 0.5kg,calculate the density of the paint
Date posted:
April 23, 2018
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Answers (1)
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Explain how the volatile liquid in a refrigerator is made to vaporize in the cooling compartment and to condense in the cooling fins
(Solved)
Explain how the volatile liquid in a refrigerator is made to vaporize in the cooling compartment and to condense in the cooling fins
Date posted:
April 22, 2018
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Answers (1)
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Given that a kg of copper contains about 10^25 atoms and that the density of copper is about 9000kg/m^3.estimate the diameter of the copper atoms?State...
(Solved)
Given that a kg of copper contains about 10^25 atoms and that the density of copper is about 9000kg/m^3. Estimate the diameter of the copper atoms?
State the assumption made.
Date posted:
April 19, 2018
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Answers (1)
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What is the difference between hard and soft magnets?
(Solved)
What is the difference between hard and soft magnets?
Date posted:
April 18, 2018
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Answers (1)
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Describe the methods of magnetizing a magnetic material.
(Solved)
Describe the methods of magnetizing a magnetic material.
Date posted:
April 18, 2018
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Answers (1)
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List the properties of magnets
(Solved)
List the properties of magnets
Date posted:
April 16, 2018
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Answers (1)
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State the applications of radioactivity
(Solved)
State the applications of radioactivity
Date posted:
April 12, 2018
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Answers (1)
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A radioactive substance has a half life of 10 hours. Calculate the percentage of the sample that remains after 25 hours.
(Solved)
A radioactive substance has a half life of 10 hours. Calculate the percentage of the sample that remains after 25 hours.
Date posted:
April 12, 2018
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Answers (1)
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A radioactive substance is found to have an activity of 360 counts per second. 5minutes later, it was 45counts per second. Determine its half life.
(Solved)
A radioactive substance is found to have an activity of 360 counts per second. 5 minutes later, it was 45 counts per second. Determine its half life.
Date posted:
April 12, 2018
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Answers (1)
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State the characteristics of gamma radiation
(Solved)
State the characteristics of gamma radiation
Date posted:
April 12, 2018
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Answers (1)
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State the characteristics of beta radiation
(Solved)
State the characteristics of beta radiation
Date posted:
April 12, 2018
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Answers (1)
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State the characteristics of alpha radiation
(Solved)
State the characteristics of alpha radiation
Date posted:
April 12, 2018
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Answers (1)
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What are the applications of photoelectric effect?
(Solved)
What are the applications of photoelectric effect?
Date posted:
April 12, 2018
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Answers (1)
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The threshold wavelength of a photoemissive surface is 0.45µm. calculate:
a. The threshold frequency of the surface.
b. The workfunction of the surface in eV.
c. The minimum...
(Solved)
The threshold wavelength of a photoemissive surface is 0.45µm. calculate:
a. The threshold frequency of the surface.
b. The workfunction of the surface in eV.
c. The minimum speed with which a photoelectron is emitted if the frequency of the radiation is 7.5x1014Hz.
Date posted:
April 12, 2018
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Answers (1)
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Calculate the energy of a photon of light of frequency 5.0x1014Hz in (a) joules (b) electron-volt.
(Solved)
Calculate the energy of a photon of light of frequency 5.0x1014Hz in (a) joules (b) electron-volt.
Date posted:
April 12, 2018
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Answers (1)
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State any differences between x-rays and cathode rays.
(Solved)
State any differences between x-rays and cathode rays.
Date posted:
April 12, 2018
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Answers (1)
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An x-ray tube operates at 10kV and a current of 15mA. Calculate the number of electrons hitting the target per second.
(Solved)
An x-ray tube operates at 10kV and a current of 15mA. Calculate the number of electrons hitting the target per second.
Date posted:
April 12, 2018
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Answers (1)
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Calculate the energy of x-rays whose frequency is 3x1016Hz.(Take h=6.63x10-9Js, e=1.6x10-19C, me=9.11x10-6kg and v=3.0x108m/s)
(Solved)
Calculate the energy of x-rays whose frequency is 3x1016Hz.(Take h=6.63x10-9Js, e=1.6x10-19C, me=9.11x10-6kg and ?=3.0x108m/s)
Date posted:
April 12, 2018
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Answers (1)
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State the uses of X-Rays
(Solved)
State the uses of X-Rays.
Date posted:
April 12, 2018
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Answers (1)