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3 years ago

When water vapor is cooled it three forms into water droplets why does this represent a conservation in mass

1 answer:

8 0

In the conservation of mass, mass is never created or destroyed in chemical reactions in the same way water is not created or destroyed it is only transferred from one form to another and its mass is always conserved.

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SVETLANKA909090 [29]

Answer: velocity

Explanation: Hope this helps :)

8 0

3 years ago

A janitor standing on the top floor of a building wishes to determine the depth of the elevator shaft. They drop a rock from res

Bumek [7]

Answer:

Part a)

H = 26.8 m

Part b)

error = 7.18 %

Explanation:

Part a)

As the stone is dropped from height H then time taken by it to hit the floor is given as

$t_1 = \sqrt{\frac{2H}{g}}$

now the sound will come back to the observer in the time

$t_2 = \frac{H}{v}$

so we will have

$t_1 + t_2 = 2.42$

$\sqrt{\frac{2H}{g}} + \frac{H}{v} = 2.42$

so we have

$\sqrt{\frac{2H}{9.81}} + \frac{H}{336} = 2.42$

solve above equation for H

$H = 26.8 m$

Part b)

If sound reflection part is ignored then in that case

$H = \frac{1}{2}gt^2$

$H = \frac{1}{2}(9.81)(2.42^2)$

$H = 28.7 m$

so here percentage error in height calculation is given as

$percentage = \frac{28.7 - 26.8}{26.8} \times 100$

$percentage = 7.18$

5 0

3 years ago

Two bodies, with heat capacitiesC1andC2(assumed independent oftemperature) and initial temperatureT1andT2, respectively, are pla

Anna007 [38]

Answer:

Tբ = (C₁T₁ + C₂T₂)/(C₁ + C₂) = (C₁T₁)/(C₁ + C₂) + (C₂T₂)/(C₁ + C₂)

Explanation:

Let's Assume that T₁ > T₂, this means that, T₁ > Tբ > T₂

The zeroth law of thermodynamics explains that two bodies in thermal equilibrium will eventually end up with the same final body temperature.

Heat lost by body 1 = Heat gained by body 2

C₁ (T₁ - Tբ) = C₂ (Tբ - T₂)

C₁T₁ - C₁Tբ = C₂Tբ - C₂T₂

C₁Tբ + C₂Tբ = C₁T₁ + C₂T₂

Tբ(C₁ + C₂) = C₁T₁ + C₂T₂

Tբ = (C₁T₁ + C₂T₂)/(C₁ + C₂)

Tբ = (C₁T₁)/(C₁ + C₂) + (C₂T₂)/(C₁ + C₂)

4 0

3 years ago

Why do soundwaves move faster than the ground than through the air

Sati [7]

Answer:

Particles of matter are packed more tightly in the ground than in the air

Explanation:

the reason is that sound waves are vibrations of the molecules of the medium: therefore, if the particles of the medium are closer together (as in solids), the vibrations can be transmitted faster, and the wave can travel faster

8 0

4 years ago

7. A neutron at rest decays (breaks apart) into a proton and an electron. Energy is released in the decay, in the form of kineti

kondaur [170]

Answer:

The fraction of the total energy goes into kinetic energy of proton is $5.44 \times 10^{-4}$