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3 years ago

Why is it easier to swim in salty water than in fresh water?

Physics

2 answers:

kobusy [5.1K]3 years ago

8 0

Answer:

Salty Water

Explanation:

Swimming in Salty water gives us more buoyancy when freshwater does not.

tino4ka555 [31]3 years ago

4 0

Answer:

The salt adds mass to the water and makes it more dense, therefore you are able to float a little more than that of freshwater, as there is no salt in there. The denser the water, the more ability you have to float in it.

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The following images show the four terrestrial planets in our solar system (not to scale). Rank these planets from left to right

Elina [12.6K]

Answer:

Venus, Earth, Mars, Mercury

Explanation:

The atmospheric pressure is determined by the gravitational attraction of the planet over the atmosphere.

Since the gravitational force is defined as:

$F = G\frac{m1m2}{r^{2}}$ (1)

Notice from equation 1, how the gravitational force depends on the masses of the two objects that are interacting and the distance to the square between them.

For this particular case, m1 is the mass of the planet and m2 is the mass of the gasses in the atmosphere. While the r is the distance between those two.

Venus has a more dense atmosphere and than the Earth, so it has a higher atmospheric pressure. The same case can be seen for the Earth and Mars.

Mercury is the one with the lower atmospheric pressure since it has a thin atmosphere as a consequence of his small size.

3 0

4 years ago

What fraction of the volume of an iceberg (density 917 kg/m3) would be visible if the iceberg floats in (a) the ocean (salt wate

kondor19780726 [428]

Answer:

a) 10.4% b) 8.3%

Explanation:

According to Archimedes' principle, any object submerged in a liquid, receives an upward force (called buoyant force) numerically equal to the weight of the volume removed by the liquid.

When this force is equal to the force of gravity on the object (which we call weight, always downward) the object floats in the liquid.

Let's see what happens in the two situations we have:

a) salt water (density 1024 Kg/m³)

We can express the force of gravity on the iceberg, as follows:

Fg = mice*g = ρice*Vice*g

For the Fb (buoyant force) , we have:

Fb= ρsw*Vsub*g, where Vsub, is the fraction of the iceberg volume that is submerged.

So we can replace Vsub as follows:

Vsub = k Vice, where k is the fraction submerged, i.e. 0<k<1.

Therefore, if we need that the iceberg float, we need that Fg=Fb, as follows:

Fg= ρice*Vice*g = Fb =ρsw*k*Vice*g (1)

Simplifying common terms, we have:

ρice/ρsw = k ⇒917 kg/m³ / 1,024 kg/m³ = 0.896

This means that 89.6% of the volume is submerged, i.e. , is not visible, so the visible percentage is just the difference between 100% and 89.6%:

Vvis = 100% - 91,7% = 10.4%

b) For fresh water, we can do the same procedure, repeating (1), with the value for density of fresh water, as follows:

Fg= ρice*Vice*g = Fb =ρsw*k*Vice*g

Simplifying common terms, we have:

ρice/ρsw = k ⇒917 kg/m³ / 1,000 kg/m³ = 0.917

This means that 91.7 % of the volume is submerged, i.e. , is not visible, so the visible percentage is just the difference between 100% and 91.7%:

Vvis = 100% - 91.7 = 8.3%

3 0

4 years ago

How much pressure is created by a circular piston that is 0.24 meter in diameter

Vedmedyk [2.9K]

Answer:

4000 N/m²

Explanation:

Area = πr²

Area = π x 0.12² (diameter/2)

Area = 0.05 m²

Pressure = force/area

Pressure = 200/0.05

Pressure = 4000 N/m²

Hope this helps!

8 0

3 years ago

A car engine has power than a horse because a car engine does the same amount of work in time. Yasmin and Raj each had 10 boxes

labwork [276]

Answer:

A car engine has more power than a horse because a car engine does the same amount of work in time. Yasmin and Raj each had 10 boxes of equal weight to stack next to each other on the same shelf, at the same height and in the same arrangement. Yasmin completed the task in 2 minutes, while Raj took 3 minutes to stack his boxes. Raj applied less power than Yasmin because his stacking took more time to do the same amount of work.

Explanation:

4 0

3 years ago

Read 2 more answers

What height would a 4 kg book need to be to have a potential energy of

zloy xaker [14]

Answer:

5.99 m = 6 m

Explanation:

PE = m*g*h

235.2 J = (4 kg)(9.81 m/s^2)(h)

h = (235.2 J)/(9.81*4)

h = 5.99 m

h = 6 m

5 0

4 years ago

Why is it easier to swim in salty water than in fresh water?​

Why is it easier to swim in salty water than in fresh water?