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2 years ago

How do you know that a chemical change has happened

Physics

2 answers:

Maurinko [17]2 years ago

7 0

A substance is there now that wasn't there before. (And you didn't put it there.,)

Elodia [21]2 years ago

6 0

Answer:

theres is many states of chemical change but its not exaclty the same as physical the appearence might change alittle but chemical like frying a egg is a chemical change because a change of materials into another, new materials with different properties and one or more than one new substances are formed and the subtance changeing or the materials can show chemical changed happened you cant always see it but touching too like heat energy can show a chemical change

Explanation:

i hope this helps and keep ur grades up :)

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You are in space watching the two astronauts at rest in your frame of reference. They have identical mass, connected by a 12-m l

VARVARA [1.3K]

Answer:

4 m

Explanation:

don't think so that's the answer

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3 years ago

. Two identical blocks, each of mass M, are connected by a massless string over a pulley of radius R and moment of inertia I. Th

Dima020 [189]

The angular acceleration of a pulley is described under the equation,

$\theta = (0.5) \alpha t^2$

So things clearing,

$\alpha = \frac{ 2\theta}{t^2}$

b) For point B it is necessary to make a sum of Forces,

$\sum F=0$

In this way,

$Mg - T_1 = Ma$

$T_1 = Mg - Ma$ (1)

For block 2, we have the following relationship,

$T_2 = Ma$ (2)

So,

$T_1 - T_2 = I \frac{a}{R}$ (3)

Substituting (1) and (2) in (3)

$Mg - Ma - Ma = I \frac{a}{R}$

So,

$a = \frac{2\theta R}{t^2}$

<em>**Note that</em> $\alpha R = a$

c) For this point we need to use (1)

$T1 = Mg - Ma = Mg - \frac{M^2\theta R}{t^2}$

using (2)

$RT_2=RT_1-I\alpha$

$T_2= \frac{RM(g-\frac{2\theta R}{t^2})-I\frac{2\theta}{t^2}}{R}$

$T_2=\frac{RMgt^2-2R^2M\theta-2t\theta}{Rt^2}$

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3 years ago

What times what equals 400

Radda [10]

If you're willing to consider fractions or decimals,
then there are an infinite number of answers.
Like (2.5 x 160), and (15 x 26-2/3).

If you want to stick to only whole numbers,
then these 8 combinations do:

1, 400
2, 200
4, 100
5, 80
8, 50
10, 40
16, 25
20, 20

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4 years ago

1.After striking the ball, it is important to ______.

egoroff_w [7]

Answer:

1=A 2=3 3=Badmintion

Explanation:

I think I'm correct on these

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4 years ago

Read 2 more answers

How much energy is contained in the mass of a 60-kilogram person?

Feliz [49]

<span>The energy in the body depends on the work and the type of food the person had in a 60 kg person / 40 kg person.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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3 years ago