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Soloha48 [4]
3 years ago
11

Is a rock that cools quickly after lava rusted through a volcano what is the best description of its texture

Physics
2 answers:
umka21 [38]3 years ago
7 0
I think glass. Where does rust play a part of lava?

gavmur [86]3 years ago
3 0
The physical description would be soft due to the lava cooling the rock.
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A projectile is fired in such a way that its horizontal range is equal to 13.5 times its maximum height. What is the angle of pr
True [87]
Maximum height: h  = v0² sin² α / 2 g
Horizontal range: x = v0² sin 2 α / g
13.5 v0² sin² α /2 g  = v0² sin 2 α /g          / :  v0²/g
6.75 sin² α = 2 sin α cos α    / : sin α
6.75 sin α = 2 cos α    / : cos α
6.75 tan α = 2
tan α = 0.2963
α = tan^(-1) 0.2963
α = 16.504° ≈ 16.5°
The angle of projection is 16° 30`.
6 0
3 years ago
Read 2 more answers
How does a centripetal force cause circular motion? It acts at a right angle to the object's motion and causes the object to con
poizon [28]

Answer:

Centripetal force comes from the Latin, centrum = centre and petere=to seek. It acts perpendicular to the object path, towards the center of the curve. This results in change of the direction of the object's velocity but not in change of object's speed.

So only the first option is correct: It acts at a right angle to the object's motion and causes the object to constantly change direction.

Explanation:

7 0
4 years ago
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X-Rays contradict to?<br> a)beta b) alpha.<br> C) gamma
Vesna [10]
<h3>X-Rays contradict to?</h3>

<h3>C. gamma </h3>

a type of penetrating electromagnetic radiation produced by the radioactive disintegration of atomic nuclei

3 0
3 years ago
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a 2.0kg ball is resting at the top of a 20 m hill. if the ball rolls down the entire hill, how fast will it be going?
ratelena [41]

Speed of ball is 19.80 m/s .

<u>Explanation:</u>

We have , a 2.0 kg ball is resting at the top of a 20 m hill. if the ball rolls down the entire hill,We need to find how fast will it be going.Let's find out:

We know that,

Potential energy : This is the energy possessed by an object due to it's virtue of height and is given by P.E = mgh , where m is mass , g is acceleration due to gravity & h is height !

Kinetic energy : This is the energy possessed by an object due to it's virtue of motion and is given by K.E = \frac{1}{2}mv^2 , where m is mass & v is the velocity of object !

By conservation of energy :

⇒ P.E.=K.E

⇒ mgh=\frac{1}{2} mv^2

⇒ v=\sqrt{2gh}

According to question , h=20 m i.e.

⇒ v=\sqrt{2(9.8)20}

⇒ v=\sqrt{392}

⇒ v=19.80m/s

Hence , Speed of ball is 19.80 m/s .

7 0
3 years ago
Which equation below would you use to determine the number of neutrons in a given nucleus when you are given the atomic number (
Mademuasel [1]

Answer:

A-Z

Explanation:

A proton has an estimated weight of 1.

6 0
4 years ago
Read 2 more answers
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