Dangers of Bernoulli’s effect
? Blowing of roof tops- when a fast moving air passes above a roof top, the air pressure above the roof will be higher than that below it. Thus the resultant upwards force acting on the roof may blow it off if it is large enough.
? Car accidents- when a small car and a large truck both travelling at high speeds and in opposite
directions overtake each other, the small car is likely to be dragged onto the truck. The speed of air
between the car and the truck is very high and hence a low pressure exists between them. The resultant
inward force acting them draws them closer together. The car being lighter has a higher chance of being
dragged onto the truck, causing an accident.
Moraa orina answered the question on April 8, 2018 at 16:26
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Explain the applications of Bernoulli’s principle
(Solved)
Explain the applications of Bernoulli’s principle
Date posted:
April 8, 2018
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Answers (1)
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Explain the factors affecting speed of sound in air
(Solved)
Explain the factors affecting speed of sound in air
Date posted:
April 8, 2018
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Answers (1)
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A convex mirror of focal length 9cm produces an image on its axis 6cm from the mirror. Determine the
position of the object.
(Solved)
A convex mirror of focal length 9cm produces an image on its axis 6cm from the mirror. Determine the
position of the object.
Date posted:
April 8, 2018
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Answers (1)
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At what angle should two mirrors be inclined to form:a) 17 images?b) 29 images?
(Solved)
At what angle should two mirrors be inclined to form:
a) 17 images?
b) 29 images?
Date posted:
April 7, 2018
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Answers (1)
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A lamp of height 6cm stands in front of a pinhole camera at a distance of 24cm. the camera screen is 8cm from the...
(Solved)
A lamp of height 6cm stands in front of a pinhole camera at a distance of 24cm. The camera screen is 8cm
from the pinhole. What is the height of the image of the lamp on the screen?
Date posted:
April 6, 2018
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Answers (1)
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State the factors affecting thermal conduction in solids
(Solved)
State the factors affecting thermal conduction in solids
Date posted:
April 6, 2018
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Answers (1)
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Describe an experiment to demonstrate Brownian motion in air (the smoke cell experiment)
(Solved)
Describe an experiment to demonstrate Brownian motion in air (the smoke cell experiment)
Date posted:
April 6, 2018
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Answers (1)
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Describe an experiment to demonstrate Brownian motion in liquids
(Solved)
Describe an experiment to demonstrate Brownian motion in liquids.
Date posted:
April 6, 2018
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Answers (1)
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A man weighs 900N on earth and 150N on the moon. If the earth’s gravitational field strength is 10N/kg,
determine the moon’s gravitational field strength.
(Solved)
A man weighs 900N on earth and 150N on the moon. If the earth’s gravitational field strength is 10N/kg,
determine the moon’s gravitational field strength.
Date posted:
April 6, 2018
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Answers (1)
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A body weighs 75N on the earth’s surface. Calculate its mass in grams if g= 10 N/kg.
(Solved)
A body weighs 75N on the earth’s surface. Calculate its mass in grams if g= 10 N/kg.
Date posted:
April 6, 2018
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Answers (1)
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1800cm3 of fresh water of density 1000kgm-3 is mixed with 2200cm3 of sea water of density 1025kgm-3.
Calculate the density of the mixture in gcm-3.
(Solved)
1800cm3 of fresh water of density 1000kgm-3 is mixed with 2200cm3 of sea water of density 1025kgm-3.
Calculate the density of the mixture in gcm-3.
Date posted:
April 6, 2018
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Answers (1)
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The mass a 50cm3 density bottle is 10.0g when empty and 60.0g when filled with copper turnings upto a certain level. Some water is...
(Solved)
The mass a 50cm3 density bottle is 10.0g when empty and 60.0g when filled with copper turnings upto a
certain level. Some water is added into the bottle until it is full. The mass of the bottle and its contents is found to be 90.0g. Determine the density of the copper turnings.
Date posted:
April 6, 2018
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Answers (1)
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A battery is rated at 30 Ah. For how long will it work if it steadily supplies a current of 3 A?
(Solved)
A battery is rated at 30 Ah. For how long will it work if it steadily supplies a current of 3 A?
Date posted:
April 5, 2018
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Answers (1)
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The length of a pinhole camera is 25.0 cm. An object 2.0 cm is placed 10.0 m from the
pinhole. Calculate the height of the...
(Solved)
The length of a pinhole camera is 25.0 cm. An object 2.0 cm is placed 10.0 m from the
pinhole. Calculate the height of the image produced and its magnification
Date posted:
April 5, 2018
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Answers (1)
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Calculate the height of a building 300 m away from a pinhole camera which produces
an image 2.5 cm high if the distance between the...
(Solved)
Calculate the height of a building 300 m away from a pinhole camera which produces
an image 2.5 cm high if the distance between the pinhole and the screen is 5.0 cm.
Date posted:
April 5, 2018
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Answers (1)
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The master cylinder piston in a car braking system has a diameter of 2.0 cm. The
effective area of the brake pads on each of...
(Solved)
The master cylinder piston in a car braking system has a diameter of 2.0 cm. The
effective area of the brake pads on each of the four wheels is 30 cm2
. The driver
exerts a force of 500 n on the brake pedal. Calculate
a) The pressure in the master cylinder
b) The total braking force in the car.
Date posted:
April 4, 2018
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Answers (1)
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The area of the smaller piston of a hydraulic press is 0.01 m2 and that of the bigger piston is 0.5 m2. If the force...
(Solved)
The area of the smaller piston of a hydraulic press is 0.01 m2
and that of the bigger
piston is 0.5 m. If the force applied to the smaller piston is 2 N, what force is
transmitted to the larger piston?
Date posted:
April 4, 2018
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Answers (1)
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Explain the applications of pressure in gases and liquids
(Solved)
Explain the applications of pressure in gases and liquids
Date posted:
April 4, 2018
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Answers (1)
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The height of the mercury column in a barometer is found to be 67.0 cm at a certain place.
What would be the height of...
(Solved)
The height of the mercury column in a barometer is found to be 67.0 cm at a certain place.
What would be the height of a water barometer at the same place? (densities of mercury-
1.36 × 104
kg/m3
and water- 1.0 × 103
kg/m3
).
Date posted:
April 4, 2018
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Answers (1)
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The density of mercury is 13,600 kgm-3
. Determine the liquid pressure at a point 76 cm
below the surface of mercury. (Take g = 10...
(Solved)
The density of mercury is 13,600 kgm-3
. Determine the liquid pressure at a point 76 cm
below the surface of mercury. (Take g = 10 Nkg-1
)
S
Date posted:
April 4, 2018
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Answers (1)