PHYSICS HIGH SCHOOL

Explain what it means when we describe an ecosystem as being in equilibrium

Answers

Answer 1
Answer: When we say that ecosystem is in equilibrium we mean it is in stable or normal state
Answer 2
Answer: that beans balanced

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A baseball of mass 250g, pitched with a speed of 40m/s is caught by the catcher, whose glove moves backward 0.25m while stopping the ball. What was the kinetic energy of the ball before it was caught?
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What fuel(s) are the main energy source during short, intense bursts of exercise?Metabolism of protein only
Metabolism of fat only
Metabolism of carbohydrate only
Carbohydrates and vitamins
Caffeine
Medium-chain triglycerides
Erythropoietin
Carnitine

Answers

The answer is Metabolism of carbohydrate only. Remember that metaolism is the set of biochemical reactions that occur in the living organism to obtainn energy from food. The most important carbohydrate is glucose. Glucose readily oxydizes into CO2 and water and produces energy.

because the snow suddenly gets too slushy, you decide to carry your 100-newton sled the rest of the way home. How much workdo you you do when you pick up your sled, lifting it 0.5meter upward? How much work do you do to carry the sled if your house is 800 meters away?

Answers

You do 50 Joule work when you pick up your sled, lifting it 0.5meter upward.

You do no work to carry the sled to your home.

What is work?

Work in physics is the energy that is transferred to or from an item when a force is applied along a displacement. For a constant force acting in the same direction as the motion, the work is simply equal to the product of the force's magnitude and the distance travelled.

When a force is applied, it is said to have a component that moves the point of application, or it is said to have positive work.

Hence, lifting it 0.5meter upward, you have to work = weight of the sled × distance × cos 0°

= 100 N × 0.5 meter × 1

= 50 Joule.

To carry the sled to your home,  you have to work = weight of the sled × distance × cos 90°

= 100 N × 800 m × 0

= 0.

Learn more about work here:

brainly.com/question/18094932

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When you lift it the work is 50 joules. When heading home the work is 80000joules

_____ is the combination of two nuclei to produce a nucleus of heavier mass.a. fission
b. nuclear radiation
c. radioactivity
d. fusion

Answers

The answer to the given above is letter D. fusion. This is an essential process in the radioactivity where two nuclei combine to produce a heavier one. The combination release a nuclear energy. Its opposite process is a nuclear fission.

Answer: your answer is Fusion

Water _____.a. has a pH value of 0
B: expands when it freezes
C: is less dense than ice
D: dissolves in most substances

Answers

Water does not have a pH of 0, its actually 7. Also, it is not less dense than ice. Lastly, it does not dissolve in most substances, its the complete opposite. As its a solvent, not a solute. 

Answer: B

Justin is standing in the tee box and swings the golf club. As he swings, the end of the golf club gains speed and _____________. A. Chemical energy B. Kinetic energy C. Potential energys he swings,

Answers

Kinetic energy is gained.

Potential energy is gained here as he swings.

A train deports from a station at a constant acceleration of 5 m/s what is the speed of the train at the end of 20 seconds ?

Answers

You multiply the length of time by the speed, to get 100m/s
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A 55kg female bungee jumper fastens one end of the cord (made of elastic material) to her ankle and the other end to a bridge. Then she jumps off the bridge. As the cord is stretching it exerts an elastic force directed up on her. Calculate her acceleration at the instant the chord exerts an elastic force of 825N [up] on her.