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Karolina [17]
3 years ago
9

Why does cold water sink?

Physics
2 answers:
seraphim [82]3 years ago
8 0
It’s because warm air is less dense
KATRIN_1 [288]3 years ago
6 0
Because Any object or substance that is less dense than a fluid will float in that fluid, so hot water rises (floats) in colder water. When fluids are cooled, they contract and therefore become more dense. Any object or substance that is more dense than a fluid will sink in that fluid, so cold water sinks in warmer water
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Why is traveling between the stars (by creatures like us) difficult?
mariarad [96]

Answer:

Stars are at large distances that even light takes thousands of years to reach us from there.

for example, alpha centauri is 4300 light years away from earth and it is considered the nearest star to us, this means that light from there takes 4300 years to reach us and with a spaceships that can move with the speed of light is would take us 4300 years to get there which is imposible to live for that long.

hence, it is difficult to move between the stars.

4 0
3 years ago
It is correct to say that impulse is equal toA) momentum.B) the change in momentum.C) the force multiplied by the distance the f
Elena-2011 [213]

Answer:

B) the change in momentum.

Explanation:

The impulse is defined as the product between the force applied on an object (F) and the duration of the collision (\Delta t):

J=F \Delta t (1)

We can rewrite the force by using Newton's second law, as the product between mass (m) and acceleration (a):

F=ma

So, (1) becomes

J=ma \Delta t

Now we can also rewrite the acceleration as ratio between the change in velocity and change in time: a=\frac{\Delta v}{\Delta t}. If we substitute into the previous equation, we find

J=m\frac{\Delta v}{\Delta t}\Delta t=m\Delta v

And the quantity m\Delta v is equivalent to the change in momentum, \Delta p.

6 0
3 years ago
Which Sentence Describes A Physical Property
Alina [70]

The answer is (a).

Golf balls have a higher density than water hence sink to the bottom.

8 0
3 years ago
A car decelerates uniformly from 54 m/s to 38 m/s in 8.0 seconds. How far does it travel dunng this time?
galina1969 [7]

Answer:

368m

Explanation:

dx=vt

54+38/2=46

46*8=368m

7 0
3 years ago
How high would a 75 kg hiker have to climb to increase her potention by 12000 J
LekaFEV [45]

16.33m

Explanation:

Given parameters:

Mass of the hiker = 75kg

Potential energy = 12000J

Unknown:

Height = ?

Solution:

The potential energy is the energy at rest of a body.

   Potential energy =  mgh

m is the mass of the hiker

g is the acceleration due to gravity

h is the height

  The unknown is the height;

          Height = \frac{Potential energy}{mg}

           Height = \frac{12000}{75 x 9.8} = 16.33m

Learn more:

Potential energy brainly.com/question/10770261

#learnwithBrainly

5 0
3 years ago
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