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vivado [14]
4 years ago
5

Science Help ASAP please!!! 35 points what is the primary role of the respiratory system in humans.

Physics
1 answer:
jolli1 [7]4 years ago
7 0
B) To obtain oxygen

The respiratory system gets rid of carbon dioxide in exchange for oxygen
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Why do water molecules tend to stay together and hold their shape? Name and explain the phenomenon by which this happens
vekshin1

Answer:

because liquid and solid states of water possesses intermolecular force of attraction which held the molecules of water in fixed

7 0
3 years ago
I place an ice cube with a mass of 0.223 kg and a temperature of −35◦C is placed into an insulated aluminum container with a mas
Nadya [2.5K]

To solve this problem it is necessary to use the calorimetry principle. From the statement it asks about the remaining ice, that is, to the point where the final temperature is 0 ° C.

We will calculate the melted ice and in the end we will subtract the total initial mass to find out how much mass was left.

The amount of heat transferred is defined by

Q = mc\Delta T

Where,

m = mass

c = Specific heat

\Delta T =Change in temperature

There are two states, the first is that of heat absorbed by that mass 'm' of melted ice and the second is that of heat absorbed by heat from -35 ° C until 0 ° C is reached.

Performing energy balance then we will have to

Q_i-E_h = Q_m

Where,

Q_ i= Heat absorbed by whole ice

Q_m= Heat absorbed by mass

E_h= Heat energy by latent heat fusion/melting

m_i*c_i \Delta T +m*L_f  = (m_wc_w+m_{al}c_{al})\Delta T

Replacing with our values we have that

0.223*2108(-(-35))+m*3.34*10^5 = (0.452*4186+0.553*902)(27-0)

16452.9+334000m = (1892.072+498.806)*27

Rearrange and find m,

m = 0.144Kg

Therefore the Ice left would be

m' = 0.223-0.144

m' = 0.079Kg

Therefore there is 0.079kg ice in the containter when it reaches equilibrium

8 0
3 years ago
"Forensic entomologists study what to help solve crimes?"
Licemer1 [7]
I believe the answer is flies since they study bugs, please get another opinion to be sure.

7 0
4 years ago
Read 2 more answers
Why is the reflection of a wave at a free boundary different from reflection at a fixed boundary??
Gnoma [55]

Here is the main thing is medium. In the free boundary wave face the air medium, but in a fixed boundary wave face different medium. The change of medium effect on the change of the reflection of wave.

6 0
3 years ago
How does the gravitational force between two objects change if the distance
Anestetic [448]

Answer:

The Gravitational Force is reduced 4 times

Explanation:

The equation of Gravitational force follows:

F = (G*m1*m2)/r^2

Assume that G*m1*m2 = 1 and r = 1:

F = 1/1^2 = 1 N

Multiply the radius by 2

F = 1/2^2 = 1/4 N

So doubling the distance reduces the force 4 times.

7 0
3 years ago
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