1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
elena-14-01-66 [18.8K]
3 years ago
8

Convection currents in air and water occur because _____. warm fluids are less dense than cold fluids cold fluids are less dense

than warm fluids the molecules of warm fluids bump into the molecules of cold fluids electromagnetic waves move the air or water
Physics
2 answers:
PtichkaEL [24]3 years ago
7 0

Answer: Option (a) is the correct answer.

Explanation:

A process in which a fluid (liquid or gas) whose cooler material (more dense) sinks at the bottom and warm material (less dense) rises at the top is known as convection process.

This intermixing of materials leads to the development of convectional currents.

Therefore, we can conclude that convection currents in air and water occur because warm fluids are less dense than cold fluids.

GrogVix [38]3 years ago
4 0
Warm fluids are less dense than cold fluids.
You might be interested in
State examples of a transverse wave. ​
laiz [17]

ripples on the surface of water.

vibrations in a guitar string.

a Mexican wave in a sports stadium.

electromagnetic waves – eg light waves, microwaves, radio waves.

seismic S-waves.

6 0
2 years ago
Read 2 more answers
A small airplane with a wingspan of 18.0 m is flying due north at a speed of 63.6 m/s over a region where the vertical component
choli [55]

Answer:

(a) ε = 1373.8.

(b) The wingtip which is at higher potential.

Explanation:

(a) Finding the potential difference between the airplane wingtips.

Given the parameters

wingspan of the plane is = 18.0m

speed of the plane in north direction is = 70.0m/s

magnetic field of the earth is = 1.20μT

The potential difference is given as:

ε = Blv

where ε = potential difference of wingtips

B = magnetic field of earth

l = wingspan of airplane

v = speed of airplane

ε = 1.2 x 18.0 x 63.6

ε  = 1373.8

(b) Which wingtip is at  higher potential?

The wingtip which is at higher potential.

5 0
3 years ago
Item 8
Elza [17]

Answer:isotopes

Explanation:Isotopes form when the number of neutrons and atomic number change except for the protons don't change

8 0
3 years ago
Although these quantities vary from one type of cell to another, a cell can be 1.9 μm in diameter with a cell wall 60 nm thick.
DaniilM [7]

Answer: 2(10)^{-9} mg

Explanation:

We know the total diameter of the cell (assumed spherical) is:

d=1.9\mu m=1.9(10)^{-6} m

Then its total radius r=\frac{d}{2}=\frac{1.9(10)^{-6} m}{2}=9.5(10)^{-7} m

On the other hand, we know the thickness of the cell wall is r_{t}=60 nm= 60(10)^{-9} m and its density is the same as water (\rho=997 kg/m^{3}).

Since density is the relation between the mass m and the volume V:

\rho=\frac{m}{V}

The mass is: m=\rho V (1)

Now if we are talking about this cell as a thin spherical shell, its volume will be:

V=\frac{4}{3}\pi R^{3} (2)

Where  R=r-r_{w}=9.5(10)^{-7} m - 60(10)^{-9} m

Then:

V=\frac{4}{3}\pi (9.5(10)^{-7} m - 60(10)^{-9} m)^{3} (3)

V=2.952(10)^{-18} m^{3} (4)

Substituting (4) in (1):

m=(997 kg/m^{3})(2.952(10)^{-18} m^{3}) (5)

m=2.94(10)^{-15} kg (6)

Knowing 1 kg=1000 g and 1 mg=0.001 g:

m=2.94(10)^{-15} kg=2(10)^{-9} mg

7 0
3 years ago
Technician A says that the cooling system should be tested for leaks using a pressure-operated pressure pump. Technician B says
mart [117]

Answer:

The correct option is;

Technician A only

Explanation:

Leaks in the cooling system parts such as the radiator cap can be tested with a pressure operated hand pump by attaching the pump cap to the pump with an adaptor and apply pressure enough for there to be a release of pressure at the cap.

The pressure added to the system should be maintained for up to two minutes. If the pressure drops quicker, then there is likely to be leaks in the system

The freezing and boiling point of the coolant is measured with an antifreeze tester which carries the appropriate apparatus to measure the coolants freezing and boiling points.

3 0
2 years ago
Other questions:
  • If a plane can travel 450 miles per hour with the wind and 410 miles per hour against the wind, find the speed of the plane with
    13·2 answers
  • How do inertia and centripetal force combine to keep an object moving in circular motion?
    8·2 answers
  • Why can scientists ignore the gravitational force when studying the physics of an atom?
    12·1 answer
  • 4) Astronomers use tiny wobbles of distant stars to detect the presence of planets orbiting those stars. This occurs because the
    10·1 answer
  • Which constellation is marked by a W or M? a. Cassiopeia b. Draco c. Ursa Minor d. Ursa Major
    15·2 answers
  • How Antman can breathe when his size is smaller then oxygen molecules?​
    10·1 answer
  • In the space below, explain why you agree or disagree with the first statement: Each person in a family has the same traits. The
    13·1 answer
  • Pls answer……………………..
    15·1 answer
  • A spring is hanging from the ceiling. When a 250 gram of mass is attached to the free end, the spring elongates by 5 cm. The spr
    7·1 answer
  • I need help solving my homework problem , can somebody help me please . This class is physics two . My question is “ where the p
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!