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zheka24 [161]
3 years ago
13

Plz help me out with this

Physics
1 answer:
Natalija [7]3 years ago
8 0

B. Copernicus described the orbits of the planet's as circular.

Explanation:

He claimed that  the sun was the center of the solar system.The believe was that earth was at the center of the universe.The idea was that planets moved in perfect circles rather than ellipse.The planets orbited the sun instead of the earth.This illustration was called heliocentric.

Learn More

Copernicus model: brainly.com/question/11523103

Keywords : Copernicus ,model

#LearnwithBrainly

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Batteries are usually identified by their voltage.
Fynjy0 [20]

Answer:

Explanation:

Given parameters:

Electrical energy  = 18J

Quantity of charge Q = 12C

Unknown:

Voltage  = ?

Solution:

The expression of electrical potential energy is given as:

      Electrical potential energy  = \frac{1}{2} c v²

c is the quantity of charge

v is the voltage

           18  =  \frac{1}{2}  x 12 x v²  

           18 = 6v²  

              v² = 3  

               v = 1.7v

7 0
3 years ago
Please Help, It's Science
Marta_Voda [28]

Answer:

1. 125N

2. 200N

3. 280N

Explanation:

Force= mass × acceleration

1. force= 25×5

= 125N

2. Force= 50×4

=200N

3. Force=70×4

=280N

6 0
2 years ago
Sprinters push off from the ball of their foot, then bend their knee to bring their foot up close to the body as they swing thei
Nataliya [291]

There are two interchangeable concepts that can be applied to this theory. The first one is the moment of Inertia and the second the perioricity. When the runners put their leg forward they reduce their moment of inertia allowing their center of mass to maintain the speed they carry and not waste energy. In this way when they swing, the leg begins to act as a kind of pendulum, and remember that the pendulum is directly proportional to the length, that is,

T = 2 \pi \sqrt {l / g}

In this way, by bringing their legs closer they reduce the distance and make the period shorter.

7 0
3 years ago
What is the missing number in the nuclear reaction shown below?
sergey [27]

Answer:

\boxed{299}

Explanation:

In this reaction, Sum of Atomic Masses of Left side = Sum of Atomic Masses of right side

Let the atomic mass of Thorium be x

So,

233 = 4 + x

Subtracting 4 to both sides

x = 233-4

x = 229

5 0
3 years ago
A Ferris wheel has radius 4.0 m and makes one revolution every 30 s with uniform rotation. A woman who normally weighs 600 N is
sasho [114]

Answer:

A) Apparent Weight = 590 N

Explanation:

As we know that frequency is given as

f = \frac{1}{30}

f = 0.033 Hz

now the angular speed is given as

\omega = 2\pi f

\omega = 2\pi(0.033) = 0.21 rad/s

now at the top position we will have

mg - N = m\omega^2 R

N = mg - m\omega^2 R

N = 600 - \frac{600}{9.8}(0.21)^2(4.0)

N = 590 N

6 0
3 years ago
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