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mafiozo [28]
4 years ago
9

Which is more dense, cold freshwater or warm seawater?

Physics
2 answers:
svp [43]4 years ago
4 0
Cold freshwater<span> is </span>denser<span> than </span>warm seawater<span>, because of the salinity and temperature variations. Cold water would have less salt since the solubility of the salt is lower as compared to warm water. Hope this answers the question. Have a nice day.</span>
MAVERICK [17]4 years ago
4 0

Answer:

  • There is always the difference of energy that each atoms has inside its electronic configuration and this factor of the molecules or atoms provides the basic structure or arrangement of atoms inside the given space.As, the difference inn temperature,T or the total energy possessed by these number of molecules are the deciding factor inside the given space or region.
  • While, the atoms or molecules of the cold freshwater are said to be low on calcium ions and that they posses the energy in more compact form inside the inter molecular bonds, leaving the medium with less energy  in order to raise its temperature,T. So, the cold water has less temperature as compared to the warm seawater which posses more unsystematic-ally arranged atoms in the whole configuration of the medium.
  • And that is the reason that cold water are more dense or has more arranged or we can say that compact form of molecular arrangements inside there body, as compared to the warm water having less or proper arrangements of the molecules or atoms.

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Answer:

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Explanation:

The weight of the elevator is:

\begin{aligned}& \text{weight} \\ =\; & m\, g \\ =\; & 1600\; {\rm kg} \times 9.81\; {\rm m \cdot s^{-2}} \\ \approx\; & 15700\; {\rm N}\end{aligned}.

Since the speed of the elevator is constant, the acceleration of this elevator would be 0.

By Newton's Second Law of Motion, the net force on the elevator (proportional to acceleration) would also be 0\!. All external forces on the elevator need to be balanced in every direction.

The only two vertical forces on the elevator are:

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These two forces need to balance one another. Since the weight of the elevator is approximately 15700\; {\rm N}, the upward pull of the motor would be 15700\; {\rm N}\!. in magnitude.

The direction of this upward pull is the same as the direction of the motion of this elevator. Thus, the work that the motor did on the elevator would be positive:

\begin{aligned}& \text{work} \\ =\; & F\, s \\ \approx\; & 15700\; {\rm N} \times 15.0\; {\rm m} \\ \approx\; & 2.35 \times 10^{5}\; {\rm J}\end{aligned}.

Since the velocity of the elevator is constant, instantaneous power output of the motor would be equal to the average power of the motor:

\begin{aligned}& \text{power} \\ =\; & \frac{\text{work}}{t} \\ \approx\; & \frac{2.35 \times 10^{5}\; {\rm J}}{8.82\; {\rm s}} \\ \approx\; & 2.7 \times 10^{4}\end{aligned}.

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An object is dropped from a platform100 ft high. Ignoring wind resistance, what will its speed be when it reaches the ground?
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Answer:

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Explanation:

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