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Over [174]
3 years ago
11

What are two ways to change the state of a substance?

Physics
2 answers:
weeeeeb [17]3 years ago
7 0
Solid to liquid
Liquid to solid

By adding or removing heat energy aka thermal energy 
sammy [17]3 years ago
7 0

By adding or removing thermal energy


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Describe in short the working system of a water pump ​
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4 years ago
A 5.0-kilogram box is sliding across a level floor. The box is acted upon by a force of 27 newtons east and a frictional force o
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Answer:

The magnitude of the acceleration of the box is 2 m/s².

Explanation:

Given:

Mass of the box, m=5.0 kg

Force acting towards east, F=27 N

Frictional force acting towards west, f=17 N

Let the acceleration be a m/s².

Now, net force acting on the box towards east is given as:

F_{net}=F-f=27-17=10\textrm{ N}

From Newton's second law of motion,

F_{net}=ma\\10=5.0\times a\\a=\frac{10}{5.0}=2\textrm{ }m/s^2

Therefore, the magnitude of the acceleration of the box is 2 m/s².

6 0
3 years ago
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Two cars with the same velocity must have the same speed. True or false ?
gogolik [260]
This is True, cars with the same velocity must have the exact same speed.
3 0
3 years ago
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Suppose a star has the same apparent brightness as Alpha Centauri A ( 2.7×10−8watt/m2 ) but is located at a distance of 300 ligh
iragen [17]

For  a star that has the same apparent brightness as Alpha Centauri A ( 2.7×10−8watt/m2 is mathematically given as

L=2.7*10^30w

<h3> What is its luminosity?</h3>

Generally, the equation for the luminosity  is mathematically given as

L=4*\pi^2*b

Therefore

L=4*\pi^2*b

L=4* \pi *(2.83*10^{18})*2.7*10^{-8}

L=2.7*10^30

In conclusion, the luminosity

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What step of the scientific method involves asking a question based on an observation
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Answer: it’s the first one I think

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