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drek231 [11]
3 years ago
12

What did nicolaus copernicus discover about the universe

Physics
1 answer:
Keith_Richards [23]3 years ago
8 0

Answer:

Copernicus discoveres thr heliocentric theory. It was previously believed that everything orbited the Earth, geocentric theory. Copernicus said he believed the Earth and everything else orbited around the Sun.

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Which of the following is not a double-replacement?
zhannawk [14.2K]

Answer:

The correct answer is option D.

Explanation:

From the given options the reaction which is not a double replacement reaction is:

Zn (s) + 2HCl (aq)\rightarrow H_2 (g) + ZnCl_2 (s)

This because the above reaction is an example of single replacement reaction.

AB+C\rightarrow AC+B

Whereas;

Double replacement reaction is a type of chemical reaction in which exchange of ions among the reactants take place.

AB+CD\rightarrow AD+CB

6 0
3 years ago
Question in picture.
Ber [7]

The answers are to small to see.

4 0
3 years ago
Read 2 more answers
2. A pebble is dropped down a well and hits the water 1.5 s later. Using the equations for motion with constant acceleration, de
kow [346]

Answer:

S = 11.025 m

Explanation:

Given,

The time taken by the pebble to hit the water surface is, t = 1.5 s

Acceleration due to gravity, g = 9.8 m/s²

Using the II equations of motion

                          S = ut + 1/2 gt²

Here u is the initial velocity of the pebble. Since it is free-fall, the initial velocity

                                u = 0

Therefore, the equation becomes

                            S = 1/2 gt²

Substituting the given values in the above equation

                              S = 0.5 x 9.8 x 1.5²

                                 = 11.025 m

Hence, the distance from the edge of the well to the water's surface is, S = 11.025 m

3 0
3 years ago
Atoms with electronegativity differences below 0.4 generally form covalent<br>bonds. True or False​
STALIN [3.7K]

Answer:

True

Explanation:

Electronegativity difference of less than 0.4 characterized covalent bonds. For two atoms with an electronegativity difference of between 0.4 and 2.0, a polar covalent bond is formed-one that is neither ionic nor totally covalent.

7 0
3 years ago
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Auroras are frequently seen
Kipish [7]
Auroras are frequently seen :  B. After solar flares
The Aurora is created by an ongoing influx of particles into the Earth's  existing magnetic field,
This particles originated from the Sun as part of Solar wind

hope this helps
3 0
3 years ago
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