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
brilliants [131]
3 years ago
15

What is the ultimate source of energy for an ecosystem?

Physics
1 answer:
Romashka-Z-Leto [24]3 years ago
4 0

Answer:

Obviously the answer is Sun...

You might be interested in
If there is an object in top of another object, why does the upper object exert a downward normal force?​
rusak2 [61]

Answer:

This is because normal force is exerted perpendicularly to the point of contact between the upper and lower objects.  

Explanation:

This is because the upper object is still subject to gravitational pull. Therefore, the amount of force it exerts on the lower object due to gravity will be equal to the normal force that acts in the negative direction of gravitational force. Additionally, normal force is evident because the upper object will not go into the lower object.

4 0
3 years ago
The specific heat of a certain type of metal is 0.128 J/(g⋅∘C).0.128 J/(g⋅∘C). What is the final temperature if 305 J305 J of he
Makovka662 [10]

Answer:

45.3°C

Explanation:

Heat gained = mass × specific heat × increase in temperature

q = mC (T − T₀)

Given C = 0.128 J/g/°C, m = 94.0 g, q = 305 J, and T₀ = 20.0°C:

305 J = (94.0 g) (0.128 J/g/°C) (T − 20.0°C)

T = 45.3°C

6 0
3 years ago
Does the air exert a buoyant force on all objects in air or only on objects such as balloons that are very light for their size?
Citrus2011 [14]

Answer:

See explanation

Explanation:

Solution:-

Buoyancy is the force that causes objects to float. It is the force exerted on an object that is partly or wholly immersed in a fluid. Buoyancy is caused by the differences in pressure acting on opposite sides of an object immersed in a static fluid. It is also known as the buoyant force. Buoyancy is the phenomena due to Buoyant Force.

It is as an upward force exerted by a fluid that opposes the weight of an object immersed in a fluid. As we know, the pressure in a fluid column increases with depth. Thus, the pressure at the bottom of an object submerged in the fluid is greater than that at the top. The difference in this pressure results in a net upward force on the object which we define as buoyancy.

- The formula for buoyant force (Fb) is given:

                           Fb = ρ*g*V

- The force acts on all objects. However, it depends on the fluid density and amount of volume displaced.

- The Buoyant force exerted by air with density = 1.225 kg/m^3 on an object with volume (V) is:

                          Fb = ρ*g*V = 1.225*9.81*V = 12.02*V

- For the similar object with mass (m), the downward weight would be:

                           W = m*g

- For the object to float the buoyant force (Fb) must be greater than weight of the object:

                          Fb > W

                          12.02*V > m*9.81

                          V / m > 0.816

- The ratio of V / m must be at-least = 0.816.

- Assuming the object is fully immersed in air, then the volume displaced V = ρ_material*V

                         ρ_material < 1 / 0.816

                        ρ_material < 1.225 or ( ρ_air )

- So the for an object to float in air its material density must always be less than that of air. That why in balloons lighter gas is used which have density less than that of air like Helium.          

4 0
3 years ago
Experiments and investigations must be ____. a. approved b. repeatable c. not reproducible d. accepted
deff fn [24]
Experiments and investigations must be B. Repeatable.
7 0
3 years ago
Read 2 more answers
Directed Reading for Section 2 - Acceleration
erastovalidia [21]
Abs and piper have a great time and
5 0
3 years ago
Other questions:
  • in which type of wave are vibrations at right angles to the direction in which the wave is travelling​
    5·1 answer
  • Which is larger, 65mph or 120kph? As a percentage, how much faster is one than the other?
    5·2 answers
  • Which of the following changes will always increase the efficiency of a thermodynamic engine? Choose all correct statements.
    11·2 answers
  • How are sound waves different from light (and other electromagnetic, waves?
    11·1 answer
  • A race car starts at rest and speeds up to 40 m/s in a distance of 100 m. Determine the acceleration of the car.
    12·1 answer
  • A body is found in the woods and all you have left to analyze are bones and teeth. Explain what isotopes would be helpful to you
    12·1 answer
  • Which of these statements partially defines law?
    5·1 answer
  • During a test a rocket travels upward at 90 m/s , and when it is 50 m from the ground its engine fails. Determine the maximum he
    6·2 answers
  • The source of the centripetal force that arises when a runner rounds a curve on a track is _____.
    11·2 answers
  • A 100-n object and a 50-n object are placed on scales a and b respectively inside an elevator ascending with constant velocity
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!