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
Flura [38]
3 years ago
14

Most of the substances around you are _______

Physics
2 answers:
monitta3 years ago
5 0

Answer:

gravity

Explanation:

kirill115 [55]3 years ago
5 0

Answer:

gas

Explanation:

You might be interested in
Why does an empty plate not heat up in the microwave?
Leona [35]
Because the plate doesn't have water, and it's water which is heated by the microwave
7 0
3 years ago
A force of 100N moves a body on a horizontal frictionless surface when......
zalisa [80]

Answer:

I. Friction force exerted on the body is less than 100N

Explanation:

For  a body to be static, the moving force must be equal to the frictional force. Since the frictional force is a force of opposition. It tends to oppose the moving force acting on an object.

Hence if the moving force is greater than the force of friction, the Force of fiction will not be able to overcome the moving hence the body will tend to move.

Therefore, for a body to move, Fm > Ff or Ff < Ff

Fm is the moving force

Ff is the force of friction

Given

Fm = 100N

For the 100N body to move the frictional force must be less than 100N

4 0
2 years ago
Whats the definition of deposition​
Luda [366]
Deposition:

- when a gas changes directly to a solid

- latent heat is released

- physical change, NOT a chemical change
7 0
3 years ago
Read 2 more answers
Brainly malfunction?|<br><br> I'm not sure why but...
Brut [27]

Answer:

its probably still trying to load ur next rank or whatever it did it to me too

Explanation:

6 0
2 years ago
g The electric power needs of a community are to be met by windmills with 40-m-diameter rotors. The windmills are to be located
Ksenya-84 [330]

Answer:

Explanation:

Given Data

The diameter of the wind mills is d = 40m

Velocity of the air is V = 6 m / s

Required power output is:  P ₀ = 2100 k W

Expression to calculate the exergy of the air is

E = V ² / 2

Substitute the value in above expression

E = ( 6 m / s ) ² / 2

E = 18 m ² / s ² x (1kJ/kg / 1000m²/s²)

E = 0.018 k J / k g

Expression to calculate the density of the air is

P v =m R T

m /v = P  /RT ⋯ ⋯( I )

Here  

m  is the mass of the air,  

v  is the volume of the air,  

P  is the atmospheric pressure,  

T  is the standard temperature at the atmospheric pressure and  

R  is the gas constant

As the density is

ρ = m /V

Substitute the value in expression (I)

ρ = 101  kP a /( 0.287 k J / k g ⋅ K ) ( 298 K )

ρ = 1.180 k g / m ²

Expression to calculate the mass flow rate is

m = ρ A V ⋯ ⋯ ( I I )

Here  A  is the area of the windmill

Expression to calculate the  A  is

A = π /4  d ²

Substitute the value in above expression

A = π /4 ( 40 m ²)

A = 1256.63 m ²

Substitute the value in expression (II)

m = ( 1.180 k g / m ³) ( 1256.63 m ²) ( 6 m / s )

m = 8896.94  k g / s

Expression to calculate the maximum power available to the windmill is

P w = m ( V ² /2 )

Substitute the value in above expression

P w = 8896.94  k g / s ( (6m/s)²/2 )

P w = 160144.92 W  × ( 1 W /1000 k W )

P w = 160.144 k W

Expression to calculate the number of windmills required is

n = P o /P w

Substitute the value in above expression

n=2100kw/160.144kw

n=13.11

8 0
3 years ago
Other questions:
  • Lidia plans an experimental investigation to see how the thickness of a lens affects the point where a beam of light is focused.
    14·1 answer
  • If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the
    5·1 answer
  • an eagle carries a fish up 50 m into the sky using 90 n of force. how much work did the eagle do on the fish
    9·2 answers
  • The latent heat of fusion of alcohol is 50 kcal/kg and its melting point is -54oC. It has a specific heat of 0.60 in its liquid
    12·1 answer
  • There are two types of waves, mechanical and electromagnetic. Microwaves, infrared, and radio was are examples of electromagneti
    13·1 answer
  • What conclusions can be drawn about the existence of carbon-12, carbon-13, and carbon-14?
    15·2 answers
  • Which statement about tempture is correct
    15·1 answer
  • An 856 kg drag race car accelerates from rest to 105 km/h in .934s. What change in momentum does the force produce? Answer in un
    11·1 answer
  • Light travels through water at 2.2506 x 108 m/s. A person shines a light at a friend that is underwater. If the ray in the water
    10·2 answers
  • A sixth grader moves down the hall at 1.2 m/s. When he sees a bunch of eighth graders coming, he
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!