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3 years ago

Please help will mark brainliest

Physics

2 answers:

andreyandreev [35.5K]3 years ago

7 0

Answer:

Explanation:

it melts yes but it's still water [same element] so there fore it's a physical change

Zolol [24]3 years ago

5 0

Answer:

It does not change the chemical composition of water. Explanation: A physical reaction is defined as the reaction in which a change in shape, size takes place. No new substance gets formed in these reactions.

Explanation:

Hope this helped

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How much heat must be removed from 200 pounds of blanched vegetables at 189 degrees F to freeze them to a temperature of 22 degr

Virty [35]

To solve this problem it is necessary to apply the concepts related to heat exchange in the vegetable and water.

By definition the exchange of heat is given by

$Q =mc\Delta T$

where,

m = mass

c = specific heat

$\Delta T$ = Change in temperature

Therefore the total heat exchange is given as

$\Delta Q = Q_w+Q_v$

$\Delta Q = m_wc_w(T_i-T_f)+m_vc_v(T_i-T_f)$

Our values are given as,

Total mass is $M_T$ = 200lb ,however the mass of solid vegetable and water is given as,

$m_v= 0.4*200lb = 80lb$

$m_w=0.6*200lb=120lb$

$T_i = 183\°F\\T_f = 22\°F\\c_w = 1Btu/lbF\\c_v = 0.24Btu/lbF$

Replacing at our equation we have,

$\Delta Q = m_wc_w(T_i-T_f)+m_vc_v(T_i-T_f)$

$\Delta Q = (120)(1)(183-22)+(80)(0.24)(183-22)$

$\Delta Q = 22411.2Btu$

Therefore the heat removed is 22411.2 Btu

6 0

3 years ago

If you were to mix 7 grams of sugar into 100 grams of water, how much should the total mass of the solution be?

inn [45]

Answer:

<em>The total mass of the solution should be 107 grams</em>

Explanation:

<u>Solutions</u>

A solution is a homogeneous mixture consisting of a solute dissolved into a solvent. The solute is the substance that is being dissolved, while the solvent is the dissolving medium.

The relationship between the masses is:

$m_s=m_o+m_v$

Where:

ms = mass of the solution

mo = mass of the solute

mv = mass of the solvent

If you were to mix mo=7 gr of sugar into mv=100 gr of water, then the total mass of the solution should be:

$m_s=7~gr+100~gr$

$m_s=107~gr$

The total mass of the solution should be 107 grams

8 0

3 years ago

John and Leah want to move the piano in their living room. John pushes from behind the piano with a force of 300\text{ N}300 N30

Schach [20]

Answer:

1.3 m/s

Explanation:

(300N of Fa + 100N' of Fa) - 140N of Ff /200Kg

400N of Fa - 140N* of Ff

260 of ∑F/ 200kg = acceleration

a of piano = 1.3 m/s²

7 0

3 years ago

A 2 kg block is on a horizontal surface. A horizontal force is applied by a person to the block to pull it on the surface with a

Agata [3.3K]

Answer:

work done = 500 J

option e is correct

Explanation:

given data

mass = 2 kg

acceleration = 2 m/s

coefficient of kinetic friction = 0.3

block D = 50 m

to find out

work

solution

we know that work done is

work done = f × d ...........1

here f is force and d is block i.e 50 m

so here

force , f - k mg =ma

f = 2 ( 2 + 0.3 ×10 )

f = 10 N

so from equation 1

work done = f × d

work done = 10 × 50

work done = 500 J

option e is correct

3 0

3 years ago

Hii!!!

ra1l [238]

Answer:

Explanation:

because The properties of matter include any traits that can be measured,

Physical properties can be observed or measured.

6 0

3 years ago

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