A sound wave travels from air into a swimming pool. How does its speed
change?

Answer:

90

Explanation:

The portion where gas turns to liquid

Answer:

Yes. Space is somewhat voidless. Space has no atmosphere, just planets, stars, and dark matter. Space can be said to be special. Space never ends. Gravity would cause an object to fall down. However, since space never ends, an object could continue moving forever.

At an altitude 400 km (250 miles) above the Earth, gravity is nearly 90 % as strong as on the surface of the earth.

The gravity of Earth can be described as the net acceleration that is imparted to objects due to the combined effect of gravitation and centrifugal force. It can be defined as a vector quantity, whose direction coincides with a plumb bob and strength or magnitude.

In SI units gravitational acceleration is expressed in meters per second squared or equivalently in newtons per kilogram. Near Earth's surface, the gravity acceleration is approximately 9.81 m/s², ignoring the effects of air resistance.

The gravity of the earth decreases with altitude rises above the Earth's surface because of the greater distance from the Earth's center. At an altitude of 400 kilometers equivalent to an orbit of the ISS, gravity is nearly 90% as strong as at the Earth's surface.

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Answer:

The small pebble

Explanation:

Since the potential energy, P.E lost equals kinetic energy, K.E gained,

P.E = K.E

P.E = mgh = K.E

So, K.E = mgh where g = acceleration due to gravity and h = height of drop

Since h and g are constant

K.E ∝ m

So, the kinetic energy of the object is directly proportional to its mass. Thus, the object with the smaller mass has the lesser kinetic energy.

Since the object with the smaller mass is the small pebble, so the small pebble would have less kinetic energy as it crashes on the road at the bottom of the mountain.

Answer:

Mechanical Energy- D

Nuclear Energy- C

Thermal Energy- A

Chemical Energy- B

Explanation:

Hope this helps :)

Answer:

424.26 m/s

Explanation:

Given that Two air craft P and Q are flying at the same speed 300m/s. The direction along which P is flying is at right angles to the direction along which Q is flying. Find the magnitude of velocity of the air craft P relative to air craft Q

The relative speed will be calculated by using pythagorean theorem

Relative speed = sqrt(300^2 + 300^2)

Relative speed = sqrt( 180000 )

Relative speed = 424.26 m/s

Therefore, the magnitude of velocity of the air craft P relative to air craft Q is 424.26 m/s

Answer:

Electric potential energy

Explanation:

The Electric potential energy of a system is less than that carried out by electrostatic forces during the development of the system (as long as charges are initially cut infinitely).

The change in potential energy between an initial and final configuration  is equal to minus the work done by the electrostatic forces.

Answer:

The cloud moves 9050 meters to the east in 12.5 minutes.

Explanation:

Let suppose that mass of the cloud is negligible. meaning that effects of gravity are negligible and that altitude of the cloud remains constant. If the cloud drifts at constant velocity, travelled distance is defined by following formula:

[tex]\Delta s = v\cdot \Delta t[/tex] (1)

Where:

[tex]v[/tex] - Velocity, in meters per second.

[tex]\Delta t[/tex] - Time, in seconds.

If we know that [tex]v = 724\,\frac{m}{min}[/tex] and [tex]\Delta t = 12.5\,min[/tex], then the travelled distance after 12.5 minutes is:

[tex]\Delta s = 9050\,m[/tex]

The cloud moves 9050 meters to the east in 12.5 minutes.

Answer:

7500 N/m²

Explanation:

From the question given above, the following data were obtained:

Force (F) = 300 N

Area (A) = 400 cm²

Pressure (P) =?

Next, we shall convert 400 cm² to m². This can be obtained as follow:

1×10⁴ cm² = 1 m²

Therefore,

400 cm² = 400 cm² × 1 m² / 1×10⁴ cm²

400 cm² = 0.04 m²

Finally, we shall determine the pressure. This can be obtained as follow:

Force (F) = 300 N

Area (A) = 0.04 m²

Pressure (P) =?

P = F/A

P = 300 / 0.04

P = 7500 N/m²

Answer:

1.42 m/s²

Explanation:

From the question,

F = ma.................... Equation 1

Where F = force, m = mass of the jet, a = acceleration of the jet

make a the subject of the equation

a = F/m................. Equation 2

Given: F = 34000 N, m = 24000 kg

Substitute into equation 2

a = 34000/24000

a = 1.42 m/s²

Answer:

B Eight light-minutes

Explanation:

In the case when the distance separated earth and the sun so here we orbit the sun for a 150 million km distance and the light moves would be 300,000 kilometers per second

Now divide this

= 150 million ÷ 300,000 kilometers per second

= 500 seconds

This 500 seconds represent 8 minutes and 20 seconds

Hence, option B is correct

Answer:

B) Eight light-minutes

Answer:

Mechanical weathering is the physical breakdown of rock into smaller pieces. Chemical weathering is the breakdown of rock by chemical processes.

Explanation:

Mechanical weathering (also called physical weathering) breaks rock into smaller pieces. These smaller pieces are just like the bigger rock, just smaller. That means the rock has changed physically without changing its composition. The smaller pieces have the same minerals, in just the same proportions as the original rock.

Chemical weathering is the other important type of weathering. Chemical weathering is different from mechanical weathering because the rock changes, not just in size of pieces, but in composition Chemical weathering works through chemical reactions that cause changes in the minerals.

Answer:

The answer is 1:2.

D

Explanation:

The are the same but difference

Well its a snack

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Answer:

the answer is number 2

Explanation:

did this earlier this year

Answer: 137500 J = 138 kJ

Explanation: work W= F·s= 500 N · 275 m

Answer:

the cell which does not contain acid is called dry cell

Explanation:

it is made in a zinc container. if the dry cell is not used for a long time, it stops working due to local action.

Answer:

F=ma

5.2N=26a

a=5.2÷26=0.2

Answer:

0.2 metre square

Explanation:

acceleration=force/mass

Answer:

Slow

Explanation:

The equation is:

p = mv

m = 1200

p = 2400

2400 = 1200v      <-- divide both sides by 1200

v = 2 m/s

Answer:

w=120rpm        

Considering  it  a  disc

L=Iw

=220×(412)×120×602π

=31.415kgm/s

The angular velocity of wheel should be considered as the 31.415kgm/s  when the mass of wheel is 500 and the diameter is 500 revolutions per minute.  

Since  

So here

We know that

w = 120rpm        

And,

L = Iw

So,

= 220×(412)×120×602π

= 31.415kgm/s

hence, The angular velocity of wheel should be considered as the 31.415kgm/s.

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Answer:

From batteries to biology, how atoms move is critical for understanding how matter behaves. These new FPMD techniques streamline calculations to accelerate run time and boost efficiency, allowing researchers to simulate a million or more atoms

Explanation:

Answer:

8.158 Kilograms Force

Explanation:

Answer:

8.1577297038

Explanation:

pls give brainlest

Answer:

There are two sodium atoms for every one oxygen atom in Sodium Oxide.

Explanation:

Answer:

2 sodium atoms

1 oxygen atom

Explanation:

Sodium is in valency 1 while oxygen is in valency 2. When the two combine they exchange their valencies hence the number of their atoms. Not so sure ..

Answer:

I'm really not that good at this but i think the answer is b

Explanation:

l'm really hoping this helped u

Answer:

v = [tex]\lambda[/tex]xf = 14 x 24 336m/s

Explanation: