Kepler discovered that _____ have elliptical orbits.

Physics

2 answers:

larisa86 [58]3 years ago

8 0

Kepler discovered that THE PLANETS IN THE SOLAR SYSTEM have elliptical orbits.

baherus [9]3 years ago

6 0

Answer: The correct answer is "path of orbit of the planets".

Explanation:

Kepler gave his three laws which are known as Kepler's laws.

In his first law, he stated that the planets revolve around the sun in an elliptical orbit. The sun is located at one of the two foci of the ellipse.

This law is also known as the law of orbits.

Therefore, Kepler discovered that the path of the orbit have elliptical orbits.

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A book on a 2-meter high shelf has a mass of 0.4 kg. What is its potential energy?

poizon [28]

Answer:

$\boxed {\boxed {\sf 7.84 \ Joules}}$

Explanation:

The formula for potential energy is:

$PE=m*g*h$

where m is the mass, g is the gravitational acceleration, and h is the height.

The mass of the book is 0.4 kilograms. The gravitational acceleration on Earth is 9.8 m/s². The height of the book is 2 meters.

$m=0.4 \ kg \\g=9.8 \ m/s^2 \\h=2\ m$

Substitute the values into the formula.

$PE=(0.4 \ kg)(9.8 \ m/s^2)(2 \ m)$

Multiply the first two numbers.

0.4 kg*9.8 m/s²= 3.92 kg*m/s²
If we convert the units now, the problem will be much easier later on.
1 kg*m/s² is equal to 1 Newton. So, our answer of 3.92 kg*m/s² is equal to 3.92 N

$PE=(3.92 \ N )(2 \ m)$