if 50 drops have 1cubic cm
then one drop will have 1/50 =0.02cubic cm.
oil patch with diameter 20cm has area of 22/7*10*10=314.2857sq.cm
hence the size of oilpatch = volume of oil drop/area of oil patch
=0.02/314.2857=0.00006363cm
PROFWAMALWA answered the question on May 2, 2018 at 09:21
-
The water level in a burette is 27 cm³. If 88 drops of the bottle and the average volume of drop is 0.25cm³.What is the...
(Solved)
The water level in a burette is 27 cm³. If 88 drops of the bottle and the average volume of drop is 0.25cm³.What is the final water level in the burette?
Date posted:
April 25, 2018
.
Answers (1)
-
Describe an experiment to find the density of a solid using a density bottle
(Solved)
Describe an experiment to find the density of a solid using a density bottle
Date posted:
April 25, 2018
.
Answers (1)
-
State two ways of increasing pressure in solids
(Solved)
State two ways of increasing pressure in solids.
Date posted:
April 25, 2018
.
Answers (1)
-
Explain why ventilations are put near the roof but not near the floor
(Solved)
Explain why ventilations are put near the roof but not near the floor
Date posted:
April 24, 2018
.
Answers (1)
-
Define the following terms. a. Measurement b. Test c. Evaluation
(Solved)
Define the following terms. a. Measurement b. Test c. Evaluation
Date posted:
April 24, 2018
.
Answers (1)
-
A butcher has a beam balance and masses 0.8 kg and 3 kg. How would he measure 2.2 kg of meat on the balance at once?
(Solved)
A butcher has a beam balance and masses 0.8 kg and 3 kg. How would he measure 2.2 kg of meat on the balance at once?
Date posted:
April 24, 2018
.
Answers (1)
-
A car battery has 12V. 8 dry cells are equal to 12V. Explain why 8 dry cells are not able to start a car?
(Solved)
A car battery has 12V. 8 dry cells are equal to 12V. Explain why 8 dry cells are not able to start a car?
Date posted:
April 24, 2018
.
Answers (1)
-
Given that a kg of copper contains 10^25 atoms and that density of copper is about 9000kg/m^3,estimate the diameter of the copper atom
(Solved)
Given that a kg of copper contains 10^25 atoms and that density of copper is about 9000kg/m^3,estimate the diameter of the copper atom
Date posted:
April 23, 2018
.
Answers (1)
-
During a tsunami, a diver swam a depth of 10 cm. Determine the pressure exerted to him by water
(Solved)
During a tsunami, a diver swam a depth of 10 cm. Determine the pressure exerted to him by water.
Date posted:
April 23, 2018
.
Answers (1)
-
A student observed that in the morning that overhead electrical cable is straight? Explain this observation
(Solved)
A student observed that in the morning that overhead electrical cable is straight? Explain this observation.
Date posted:
April 23, 2018
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
What is the difference between hard and soft magnets?
(Solved)
What is the difference between hard and soft magnets?
Date posted:
April 18, 2018
.
Answers (1)
-
Describe the methods of magnetizing a magnetic material.
(Solved)
Describe the methods of magnetizing a magnetic material.
Date posted:
April 18, 2018
.
Answers (1)
-
List the properties of magnets
(Solved)
List the properties of magnets
Date posted:
April 16, 2018
.
Answers (1)
-
State the applications of radioactivity
(Solved)
State the applications of radioactivity
Date posted:
April 12, 2018
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)