see the attached file for the solution
saalim1992 answered the question on November 1, 2017 at 08:16
3.4.
Find the working in the attached file.
raphael answered the question on November 3, 2017 at 15:14
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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...
(Solved)
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
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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...
(Solved)
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
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Answers (1)
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State two advantages of a force pump over lift pump
(Solved)
State two advantages of a force pump over lift pump
Date posted:
October 27, 2017
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Answers (1)
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The smell of rotten eggs broken in a room spread throughout the room. Explain.
(Solved)
The smell of rotten eggs broken in a room spread throughout the room. Explain.
Date posted:
October 26, 2017
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Answers (1)
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Diffusion support the idea that matter is made up of small particles. Explain.
(Solved)
Diffusion support the idea that matter is made up of small particles. Explain.
Date posted:
October 26, 2017
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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.
(Solved)
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
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Answers (1)
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The barometer in a city was found to be 70 cmHg. Given that the standard atmospheric pressure is 75 cmHg and the density of mercury...
(Solved)
The barometer in a city was found to be 70 cmHg. Given that the standard atmospheric pressure is 75 cmHg and the density of mercury is 13600kg/m^3, determine the altitude of the city. (density of air is 125kg/m^3)
Date posted:
October 26, 2017
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Answers (1)
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A certain hydraulic press, a force of 100N is applied to master piston of area 25cm^2. If it is designed to produce a force...
(Solved)
A certain hydraulic press, a force of 100N is applied to master piston of area 25cm^2. If it is designed to produce a force of 6000N, determine
a. The area of the slave piston.
b. Radius of the slave piston.
Date posted:
October 26, 2017
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Answers (1)
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The atmospheric pressure on a cold day was found to be 760mmHg. Express this in N/m^2(assume density of mercury is 13600kg/m^3 and take g=10N/kg).
(Solved)
The atmospheric pressure on a cold day was found to be 760mmHg. Express this in N/m^2(assume density of mercury is 13600kg/m^3 and take g=10N/kg).
Date posted:
October 26, 2017
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Answers (1)
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A fountain pen is filled up with ink. Explain.
(Solved)
A fountain pen is filled up with ink. Explain.
Date posted:
October 26, 2017
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Answers (1)
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A mercury barometer reads 75cm in a certain place. If one was to use an alcohol barometer, what would be the minimum length used to...
(Solved)
A mercury barometer reads 75cm in a certain place. If one was to use an alcohol barometer, what would be the minimum length used to read the same pressure as the mercury barometer (take =10N/kg, mercury 13600kg/m^3, alcohol = 800kg/m^3)
Date posted:
October 25, 2017
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Answers (1)
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A mountain climber found that the air pressure at the base of a mountain is 75.0cm of mercury while at the top is 50cm of...
(Solved)
A mountain climber found that the air pressure at the base of a mountain is 75.0cm of mercury while at the top is 50cm of mercury. Given that the average density of air is 1.25kg/m^3 and the density of mercury is 13600kg/m^3. Calculate the height of the mountain.
Date posted:
October 25, 2017
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Answers (1)
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A sea diver is 45m below the surface of sea water. Given that the density of the sea water is 1030kg/m^3 and g=10kg/kg atmospheric pressure...
(Solved)
A sea diver is 45m below the surface of sea water. Given that the density of the sea water is 1030kg/m^3 and g=10kg/kg atmospheric pressure 103000pa determine the total pressure on him.
Date posted:
October 25, 2017
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Answers (1)
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A student in the coast region (sea level) made a barometer using sea-water of density 1030kg/m^3. If the atmosphere pressure is 103000 N/m^2, what is...
(Solved)
A student in the coast region (sea level) made a barometer using sea-water of density 1030kg/m^3. If the atmosphere pressure is 103000 N/m^2, what is the minimum length of the tube did the student use for the water column?
Date posted:
October 25, 2017
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Answers (1)
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Calculate the pressure due to water experience by a sea diver working 35m below the surface of the sea. (Take g=10N/kg, and density of sea...
(Solved)
Calculate the pressure due to water experience by a sea diver working 35m below the surface of the sea. (Take g=10N/kg, and density of sea water 1.02g/cm^3)
Date posted:
October 25, 2017
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Answers (1)
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A density bottle weights 70 g with water and 94 g with liquid A. Find density of liquid A if density of water is 1000 kg/m
(Solved)
A density bottle weights 70 g with water and 94 g with liquid A. Find density of liquid A if density of water is 1000 kg/m
Date posted:
October 23, 2017
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Answers (1)
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A faulty thermometer reads 2oC when dipped in ice at 0oC and 95oC when dipped in steam at 100oC. What would this thermometer...
(Solved)
A faulty thermometer reads 2oC when dipped in ice at 0oC and 95oC when dipped in steam at 100oC. What would this thermometer read if placed in water at room temperature at 18oC?
Date posted:
October 20, 2017
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Answers (1)
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The density of mercury is 13600 kg/m^3. Determine the liquid pressure at a point 70 cm under the surface of the mercury. (take g =10...
(Solved)
The density of mercury is 13600 kg/m^3. Determine the liquid pressure at a point 70 cm under the surface of the mercury. (take g =10 N/kg)
Date posted:
October 18, 2017
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Answers (1)
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An astronaut weighs 1000 N on earth. On moon, he weight 200 N. Calculate the moon’s gravitational strength. (take g= 10 N kg^-1)
(Solved)
An astronaut weighs 1000 N on earth. On moon, he weight 200 N. Calculate the moon’s gravitational strength. (take g= 10 N kg^-1)
Date posted:
October 18, 2017
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Answers (1)
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State a property of electromagnetic wave on which the operation of a radar system is based
(Solved)
State a property of electromagnetic wave on which the operation of a radar system is based
Date posted:
October 17, 2017
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Answers (1)