Problem 1
The average weight of an elephant is 4000 N.
The surface area of the sole of its foot is
0.1m2. Calculate the pressure exerted by our
foot of an elephant.
Answers
Answer:
77uuururndndhd
Explanation:
iuc hu jo ji mark as the brainlist
Answer:
Pressure =
F
A
Word problem #1:
A human may apply around 18000 pascals of pressure on the ground.
The weight of an adult elephant can be around 5000 kg. Calculate the pressure applied by this elephant on the ground. How does the pressure compared with that of humans?
Solution:
We need to do a couple of things here to find the pressure.
First, we need to convert the weight to newtons.
1 kg = 9.8 newtons, so 5000 kg is equal to 5000 × 9.8 newtons.
5000 kg = 49000 newtons
Now we need to get the area of the feet of the elephant.
An elephant foot is usually 40 to 50 cm in length and width.
Pick 45 cm, the area is approximately equal to 2025 cm2
For 4 feet, the area is 8100 cm2
Convert the area to meter squared using the following:
1 centimeter squared = 0.0001 meters squared.
8100 centimeter squared = 8100 × 0.0001 meters squared = 0.81 meter squared
Pressure =
49000
0.81
The pressure exerted on the ground by the elephant is 60492 pascals.
To compare the pressure, just do a ratio of the elephant's pressure to human's pressure.
60493 divided by 18000 equals 3.36, so the pressure is about 3 times bigger.
This is not huge compared to humans. Keep in mind that the elephant has 4 feet, which help to increase the area which in turn decrease the pressure.
Problem #2:
The weight of a pencil is 0.01 kg and the pressure the pencil applies to a table is 108.88 newtons per meter squared. Calculate the area of the pencil in contact with the table.
The weight of the pencil in newtons is 0.098 newtons.
If 4 =
24
6
Then, 6 =
24
4
By the same token,
If P =
F
A
Then, A =
F
P
Then, A =
0.098
108.88
Area = 0.0009 meter squared.
0.0009 meter squared = 0.0009 × 10000 centimeter squared = 9 centimeter squared
The 9 centimeter squared makes sense since a pencil can be 18 cm long and 0.5 centimeter wide.
How to calculate pressure of a car on the ground
The idea here is to get the weight of your car. I will let you do this one with some guidelines.
Some car weight 1500 kg. Then, get the area of the 4 tires in contact with the floor in meter squared. Finally, divide the weight by the area you found. Something similar is done if you wanted to know how to calculate pressure of a book on a table, pressure of your television on a stand, etc...
Back to Newton's second law
Recent lesson
XML RSS
follow us in feedly
Add to My Yahoo!
Law of Reflection
Mar 16, 17 03:15 PM
Great lesson about the law of reflection. Crystal clear explanation
Read More
First Name (optional)
I am at least 16 years of age. I have read and accept the privacy policy. I understand that you will use my information to send me a newsletter.Subscribe
New! Comments
Do you like the physics lessons on this site? Have your say about what you just read! Leave me a comment in the box below. Please share the lessons with your friends as well!
Home
Physics blog
Units of speed
Vectors
Trigonometric identities
Linear motion
Definition of Speed
Displacement
Velocity
Acceleration
Free fall of objects
Graph of motion
Newton's First law
Newton's Second Law
Newton's Third Law
Other types of motion
Projectile Motion
Circular motion
Momentum/Energy
Momentum
Energy
Light/sound
Vibrations/Waves
Reflection/Refraction
Properties of matter/heat
The atom
Temperature/heat
Thermodynamics
Electricity/Magnetism
Electricity Lessons
Top pages
Units of speed
Free fall equations
Acceleration word problems
Free fall problems
Velocity word problems
Galileo and the leaning tower of Pisa
What is a neutral atom?
What does friction mean?
Velocity quiz
Jetser Carasco. All Copyright © 2016. Introduction-to-physics.com
Contact me Disclaimer About me Privacy policy
This site uses cookies, some of which are required for its operation. Privacy policy.Agree and Continue
Share