Biology Middle School

The table shows the potential energy and kinetic energy of a skier at two different positions on a hill.


Position and Energy
Position (above ground) Kinetic Energy Potential Energy
100 meters 0 units 50,000 units
60 meters 20,000 units ?


What is the potential energy of the skier at a height of 60 meters above the ground?
30,000 units, because total energy decreases
70,000 units, because total energy decreases
30,000 units, because total energy remains unchanged
70,000 units, because total energy remains unchanged

Answers

Answer 1

15,000 units, because total energy is 50,000 units

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According to law of conservation of energy, energy remains conserved. It only transforms from one form to another.

The total energy here is the sum of kinetic and potential energy.

At 100 meters, total energy = Kinetic energy + potential energy = 0 units + 50000 units = 50000 units

At 30 meters, total energy = Kinetic energy + potential energy = 35000 units + x units = 50000 units

x units = 15000 units

Thus if the kinetic energy has increased from 0 to 35000 units, the potential energy must decrease from 50000 to 35000 units to keep the energy conserved.wer:

Explanation:

Answer 2
the answer is c, 30,000 untis because total
energy remains unchanged.

Related Questions

How does friction interact with objects

Answers

Answer:

When two surfaces slide over one another the tiny bumps push on each other. Friction causes a force on a surface that is in the opposite direction to its motion. Friction can be reduced by the application of lubricants.

What is Friction's Interaction?

Friction is an interaction between two objects in contact that opposes the relative motion of those two objects. It is not something fundamental (like gravity, or electromagnetic force), but it comes up enough that it will be worthwhile to talk about it.

Learn more about Friction here:

https://brainly.com/question/28356847

Answer:

Friction is a force that opposes the motion of objects in contact with each other. When two objects are in contact, the surface irregularities of the two objects interlock and create a resistance to motion, which we call friction.

The amount of friction that occurs between two surfaces depends on several factors, such as the type of materials involved, the force pressing the surfaces together, and the roughness of the surfaces. In general, rougher surfaces create more friction than smoother surfaces.

Friction can either help or hinder motion. For example, in some cases, we use friction to our advantage to create traction between our shoes and the ground to prevent slipping. Similarly, we use friction to slow down moving objects like brakes on a car.

On the other hand, friction can also be a source of energy loss. When two surfaces are in contact and rubbing against each other, some of the energy of the moving object is converted to heat due to the frictional force. This conversion of energy to heat can lead to wear and tear on the surfaces and reduce the efficiency of mechanical systems.

Overall, friction plays a crucial role in our daily lives and in the functioning of many mechanical systems. Understanding the interactions between friction and objects is important for engineering and designing effective machines and structures.

Explanation:

what role do you think the respiratory system has?

Answers

Answer:

The main role the respiratory system has is to move fresh air into your body and excrete waste from ur body.

Explanation:

The respiratory system takes up oxygen from the air we breathe and expels the unwanted carbon dioxide.
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