Which astronomer spent 20 years plotting the positions of the planets

Answers

Answer 1

Answer:

Answer

Tycho Brahe

Explanation

Tycho Brahe who was born on 1546. He was an astronomer.Tycho Brahe spent 20 years in plotting the positions of the planets and he was among those astronomers who helped in giving the heliocentric model of the universe..

Answer 2

Answer: That was Tycho Brahe, and I thought it was actually more years than that.

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A 25 N object is 3 meters up. How much potential energy does it have.
Which structure's primary function is to warm and moisten the air?a. nasal cavity b. epiglottis c. bronchus d. bronchiole
Name the physical quantity measured by the area under velocity time graph?
Astronaut John Glenn was the first American to _____.launch into spacewalk on the moonorbit the earthdo a spacewalk
Which phrase is an example of kinetic energy? Responses a car sitting motionless a car sitting motionless a girl running in a race a girl running in a race a sled sitting at the top of a hill a sled sitting at the top of a hill a tank containing gasoline

Select all that apply. Choose the statement(s) that best describe Earth's hydrologic, rock, and tectonic cycles.a. They continuously recycle Earth's materials.
b. They contribute to a balance or equilibrium of Earth's materials.
c. Old material is disposed of, never to be used again, and new material is created.
d. The cycles are powered by the earth's rotation and orbit.

Answers

Answer: a. They continuously recycle Earth's materials.

b. They contribute to a balance or equilibrium of Earth's materials.

Earth's hydrologic cycle involves the cycling of water. A natural replenishment process of water. Rock and tectonic cycles causes replenishment of rocks and geospheres. These cycles allows the generation of new materials. They contribute to a balance or equilibrium of Earth's material, for example magma release from earth crust during volcanic eruptions can destroy all nearby and superficial rocks, but when the magma solidifies to form new rocks. Therefore, materials which are destroyed are again created hence, equilibrium remains maintained.

Answer:

. They continuously recycle Earth's materials.

b. They contribute to a balance or equilibrium of Earth's materials.

Explanation:

What is the total moment of inertia of a system of several objects rotating together

Answers

Answer:

Lets take

Point mass of objects are m₁ ,m₂ ,m₃ ---and so on

The distance from axis of rotation is r₁ ,r₂ ,r₃ ----and so on

We know that moment of inertia I given as

I=∫dm .r² kg.m²

I = m₁ r₁² +m₂r₂²+m₃r₃² ------------- kg.m²

Note-

1 .For point mass

I= m r²

2.For disk

$I=(mr^2)/(2)$

3. For circular ring

I= m r²

4. For rod length of L

$I=(mL^2)/(12)$

If all the objects are rotating together then the total moment of inertia will be summation of the moment of inertia of the all objects

I(total) = I₁ +I₂ +I₃+ ------kg.m²

The total moment of inertia of a system of several objects can be expressed as : I = I₁ + I₂ + I₃ + ----- Kgm²

Assuming

The point masses of the objects are : M₁ , M₂, M₃

Distance from axis of rotation are ; r₁, r₂, r₃

Given that :

moment of inertia ( I ) ∫ dm*r² kg.m² = m₁ r₁² + m₂r₂² + m₃r₃²

For every type of object Mass is involved

For a point mass : I = mr²
For a circular ring : I = mr²
For a rod : I = mL² / 12
For a disk : I = mr² / 2

Summing up these moment of inertias since they are rotating together

I( total ) = I₁ + I₂ + I₃ + ----- Kgm²

Hence we can conclude that The total moment of inertia of a system of several objects can be expressed as : I = I₁ + I₂ + I₃ + ----- Kgm².

Learn more about moment of inertia : brainly.com/question/7020147

a string is attached to the rear-view mirror of a car. a ball is hanging at the other end of the string. the car is driving around in a circle, at a constant speed. which of the following lists gives all of the forces directly acting on the ball?

Answers

The correct answer for the question that is being presented above is this one: "b. tension, gravity and centripetal force." It gives all of the forces directly acting on the ball.

Here are the following choices:
a. Tension and gravity
b. tension, gravity and centripetal force
c. Tension
d. Tension gravity centripetal force and frictional force

What is the French word for shepherds crook

Answers

The answer would be:

Houlette de berger.

"shepherd's crook" means "houlette de berger" in french

Which of the following is a characteristic of elements A. They are always metals
B. They cannot be divided into simpler substances
C. They break down when reacting with acids
D. They can be altered with and electric current

Answers

Answer:

Explanation:

They are the BASE elements. Cannot make them any simpler.

Who first arranged the elements according to atomic mass and noticed a periodic recurrence of their physical and chemical properties?A. Henry Moseley
B. Antoine Lavoisier
C. John Dalton
D. Dmitri Mendeleev

Answers

Dmitri Mendeleev is the person who first arranged the elements according to atomic mass and noticed a periodic recurrence of their physical and chemical properties. The answer is letter D.

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Which of these objects would show the greatest parallax?a. the Sun b. Mars c. the Moon d. Polaris What is the distance an object would be from Earth if its parallax were one arcsecond? a. a parsec b. a light-year c. an arcminute d. an angular diameter

The forklift exerts a 300.0 N force on the box and moves it 15.0 m into the air. How much work does the forklift do? A. 500 J B. 1.50 * 10^3 J C. 4.50 * 10^3 J D. 0.00 J