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Angelina_Jolie [31]
3 years ago
8

Some lakes, such as the Great Salt Lake, accumulate soluble minerals such as salt. In those lakes, people find it much easier to

float than when they are in fresh water. Why is this the case?
Physics
2 answers:
olga55 [171]3 years ago
5 0
<span>The water with a lot of dissolved minerals and salts is much denser than fresh water. And with a higher density, that means that less water needs to be displaced in order to float. This difference in density can be the difference between barely floating on your back with your nose barely out of the water versus floating comfortably on your back with your entire face out of the water. For instance, fresh water at 25C has a density of 997 kg/m^3, whereas the water in the Great Salt Lake, depending upon the salinity ranges from 1035 kg/m^3 to 1200 kg/m^3. Or in simpler terms it can be about 4% to 20% denser than fresh water and you'll float 4% to 20% higher in the salt water.</span>
erastova [34]3 years ago
4 0

Answer:

B)  The salt water has a greater density than fresh water.

Explanation:

Took the test

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Two cars are moving towards each other and sound emitted by first car with real frequency of 3000 hertz is detected by a person
sertanlavr [38]

Answer:

 v ’= 21.44 m / s

Explanation:

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where it goes is the speed of sound 343 m / s, v_{s} the speed of the source v or the speed of the observer

in this exercise both the source and the observer are moving, we will assume that both have the same speed,

                v₀ = v_{s} = v ’

we substitute

               f ’= f (v + v’) / (v - v ’)

               f ’/ f (v-v’) = v + v ’

               v (f ’/ f -1) = v’ (1 + f ’/ f)

               v ’= (f’ / f-1) / (1 + f ’/ f) v

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let's calculate

                v ’= (3400 -3000) / (3000 +3400) 343

                v ’= 400/6400 343

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3) connect two lamps to a power supply in series and current drawn from the power supply is is. connect the same two lamps in pa
notka56 [123]

The current drawn by the series circuit is(R₁ + R₂)/R₁R₂  times the current drawn by the parallel circuit.

Let the resistance of the two lamps are R₁ and R₂.

Then the equivalent resistance in series combination is: R = R₁ + R₂.

And,  the equivalent resistance in parallel combination is:

r = R₁R₂/(R₁ + R₂).

So, if the supply voltage is V,

Then, current drown in series combination; i_s = V/R = V/(R₁ + R₂)

And, current drown in parallel combination; i_p = V/r = V(R₁ + R₂)/R₁R₂

So ,\frac{i_s}{i_p} = [ V/(R₁ + R₂)] /[V(R₁ + R₂)/R₁R₂]

=  (R₁ + R₂)/R₁R₂

Hence, the  ratio of current drawn in series and current drown in parallel is  (R₁ + R₂)/R₁R₂.  So, he current drawn by the series circuit is(R₁ + R₂)/R₁R₂  times the current drawn by the parallel circuit.

Learn more about electric current here:

brainly.com/question/2264542

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skad [1K]
Through heat waves I'm pretty sure
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coldgirl [10]

1) 12.5 N east

There are two forces acting on the box along the horizontal direction:

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- The force of friction of 2.5 N west, we indicate it with F_f

Taking east as positive direction, we can write the two forces has

F=+15 N\\F_f = -2.5 N

Therefore, the net force on the box will be:

F_{net} = F + F_f = 15 + (-2.5) = +12.5 N

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We can solve this part by using Newton's second law:

F_{net}=ma

where

F_{net} is the net force on the box

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a is the acceleration

For the box in this problem,

F_{net} = 12.5 m/s^2 (east)

m = 5.0 kg

Solving for a, we find the acceleration:

a=\frac{F_{net}}{m}=\frac{12.5}{5.0}=2.5 m/s^2

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Digiron [165]

Answer:

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