1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Gala2k [10]
3 years ago
7

What is the approximate uncertainty in the area of a circle of radius 4.5×10^4 cm? Express your answer using one significant fig

ure.
Physics
1 answer:
Igoryamba3 years ago
5 0

Answer:

A=6.36\times 10^5\ m^2

Explanation:

It is given that,

Radius of the circle, r=4.5\times 10^4\ cm=4.5\times 10^2\ m

The area of the circle is given by :

A=\pi r^2

A=\pi (4.5\times 10^2\ m)^2

A=636172.51\ m^2

or

A=6.36\times 10^5\ m^2

As there is no uncertainty given in the radius of the circle. So, the area of the circle is 6.36\times 10^5\ m^2. Hence, this is the required solution.

You might be interested in
An object is moving along a straight line. The graph shows the velocity of the object over
iren [92.7K]

Answer:

From 9 to 10 sec the velocity is decreasing at a constant rate.

Change in V = 20 m/s - 30 m/s = -10 m/s

Since acceleration is constant from point E to point F (straight line)

and t = 9.5 sec is on this line

a = (20 m/s - 30 m/s) / 1 sec = -10 m/s^2  

8 0
2 years ago
Read 2 more answers
A sample of a substance has a high density, yet a low particle motion. This sample must be a
avanturin [10]
The most possible answer is letter B) Liquid. 
If we are going to base the answer to the motion of particles, liquid is the best answer since solid's particle cannot move for they are tightly packed while the particles of gas and plasma (ionized gas) are free and move at high speeds.
3 0
3 years ago
Read 2 more answers
Describe what the sun would look like from earth if the entire photosphere were the same temperature as a sunspot?
vichka [17]

The sun would look like from earth if the entire photosphere were the same temperature as a sunspot then wouldn't see anything from Earth but darkness

The lowest layer of the sun is the photosphere. It is the outer layer of the sun. It is the deepest region of the luminous object. It is composed of convection cells which are called granules . The Sun's photosphere has a temperature between 4,500 and 6,000 K

Sunspots are areas where the magnetic field is about 2,500 times stronger than Earth's, much higher than anywhere else on the Sun.  Because of the strong magnetic field, the magnetic pressure increases while the surrounding atmospheric pressure decreases.

Sunspots tend to occur in pairs that have magnetic fields pointing in opposite directions.  A typical spot consists of a dark region called the umbra, surrounded by a lighter region known as the penumbra.  

The sunspots appear relatively dark because the surrounding surface of the Sun (the photosphere) is about 10,000 degrees F, while the umbra is about 6,300 degrees F.  Sunspots are quite large as an average size is about the same size as the Earth.

If the photosphere were of the same temperature as the sunspot, then we wouldn't see anything from Earth but darkness. We were only able to see and recognize the sunspot because it is surrounded by the visible photosphere.

To learn more about photosphere here

brainly.com/question/3598352

#SPJ4

8 0
2 years ago
3. Calculate the momentum of a 1200kg car with a velocity of 25m/s.
antiseptic1488 [7]

momm=massxvelocity

momm=1200x2.5=120x25=600x5=3000kgm/s

4 0
3 years ago
What is an electrical current which comes from a battery
koban [17]

Answer:

Direct current

Explanation:

The current that is supplied by electric cells and batteries.Electons flows in one direction and does not change directions.

5 0
3 years ago
Other questions:
  • An aluminum pie plate of radius 0.12 m is spins and accelerates at a constant rate from 13 rad/s to 29 rad/s in 5.4 s. What was
    10·1 answer
  • Which best describes the importance of mitosis to living organisms? genetic variation and growth growth and development developm
    8·1 answer
  • I NEED HELP ON PHYSICAL SCIENCE; WORK
    7·2 answers
  • How does the nucleus of an atom change when it emits an alpha or beta particle?
    12·1 answer
  • 10.
    14·1 answer
  • What planet has the most visible rings
    9·2 answers
  • What’s the resistance of the circuit
    9·1 answer
  • a force 4000 n accelerates a car of mass 800 kg from rest to 20 ms how far does the car travel while the force is acting?​
    7·1 answer
  • Where do you weight more on top of Mt. Everest (Highest Mt. in the world) or at the beach
    12·1 answer
  • Write 5 advantages and disadvantges of force. <br><br>aka. physics<br><br>aka. pull and push ​
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!