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3 years ago

How do we know that salt mixing with water is not a chemical change?

Physics

2 answers:

ikadub [295]3 years ago

8 0

Answer:

its a chemical change

Explanation:

mix salt and water together to see what its taste like

taurus [48]3 years ago

5 0

Explanation:

In contrast, dissolving a covalent compound like sugar does not result in a chemical reaction. When sugar is dissolved, the molecules disperse throughout the water, but they do not change their chemical identity.

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A playground merry-go-round of radius R = 1.20 m has a moment of inertia I = 240 kg · m2 and is rotating at 9.0 rev/min about a

Vesnalui [34]

Answer:

ω' = 0.815 rad/s

Explanation:

Given,

R = 1.20 m

Inertia of merry-go- round= 240 kg.m²

Rotating speed = 9 rpm = $9\times \dfrac{2\pi}{60}$

=0.9424 rad/s

mass of the child, m = 26 kg

angular speed of the merry-go-round=?

we know

Angular momentum, L = I ω

Moment of inertia of the child

I' = m r² = 26 x 1.2² = 37.44 kgm²

Conservation of angular momentum

initial angular momentum = Final angular momentum

I ω = (I+I')ω'

240 x 0.9424 = (240+37.44) ω'

226.176= 277.44 ω'

ω' = 0.815 rad/s

new angular speed of the merry-go- round is equal to 0.815 rad/s

3 0

4 years ago

What is work in science

mr_godi [17]

Answer:

The scientific defenision of work reveals its relationship to energy; whenever work is done, energy is transfered.

4 0

3 years ago

Plz help me ASAP How does sound travel from its source to your ear??? 1. By changes in air pressure 2. By vibrations in wires or

Sholpan [36]

Answer:

2. By vibrations in wires or strings.

8 0

4 years ago

A 7.0- g bullet is fired into a 1.5- kg ballistic pendulum.The

777dan777 [17]

Answer:

the initial velocity of bullet is u = 330.335 m /s

Explanation:

given,

mass of bullet(m) = 7 g

Mass of pendulum ( M ) = 1.5- kg

The bullet emerges from the block with a speed (V) = 200 m/s

The maximum height ( h ) = 12 cm.

Let the initial speed of the bullet be ' u '

Apply, Law of conservation of momentum :

m u = ( m + M ) V ...............................(1)

Apply, Law of conservation of Energy :

$\dfrac{1}{2}( m + M ) V^2 = ( m + M )g h$ ...............(2)

From equation (1) and equation (2) , we have

$u = \dfrac{m + M}{m}V$

But V = √2gh

$u=\dfrac{m + M}{m}\times \sqrt{2gh}$

$u=\dfrac{0.007+1.5}{0.007}\times \sqrt{2\times 9.81\times 0.12}
$

u = 330.335 m /s

hence, the initial velocity of bullet is u = 330.335 m /s

4 0

3 years ago

What are the three forms of water discussed in the passage?

andrezito [222]

Answer:

The three forms of water are gas, liquid, and ice, I'm not sure if these were mentioned in the passage since you did not attach a picture.

Please mark this the Brainliest.

7 0

3 years ago