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
Juliette [100K]
3 years ago
9

REMARKS The speed found in part (a) is the same as if the woman fell vertically through a distance of 21.9 m. The result of part

(b) is negative because the system loses mechanical energy. Friction transforms part of the mechanical energy into thermal energy and mechanical waves, absorbed partly by the system and partly by the environment. QUESTION If the slide were not frictionless, would the shape of the slide affect the final answer
Physics
1 answer:
sasho [114]3 years ago
5 0

Answer:

Yes, if the system has friction, the final result is affected by the loss of energy.

Explanation:

The result that you are showing is the conservation of mechanical energy between two points in the upper one, the energy is only potential and the lower one is only kinetic.

In the case of some type of friction, the change in energy between the same points is equal to the work of the friction forces

    W_{fr} = ΔEm

    W_{fr} = Em_{f} -Em₀

As we can see now there is another quantity and for which the final energy is lower and therefore the final speed would be less than what you found in the case without friction.

    Em_{f} =W_{fr} + Em₀

 

Remember that the work of the rubbing force is negative, let's write the work of the rubbing force explicitly, to make it clearer

    ½ m v² = -fr d + mgh

    v = √(-fr d 2/m + 2 gh)

    v = √ (2gh - 2fr d/m)

Now it is clear that there is a decrease in the final body speed.

Consequently, if the system has friction, the final result is affected by the loss of energy.

You might be interested in
The total quantity of an object's matter is called its
SVEN [57.7K]

Answer:

The quantity of matter that an object contains is called its mass. Mass is a measure of how much matter it takes to make up a specific object.

Explanation:

6 0
3 years ago
Read 2 more answers
For question #17, use the following picture:
Serhud [2]

Explanation:

18. __Double displacement__ 2LiBr + Pb(NO₃)₂ → PbBr₂ + 2LiNO₃

In a double displacement reaction, there is an actual exchange of partners to form new compounds.

 The driving condition for this kind of reaction are:

  • formation of an insoluble compound called precipitate
  • formation of water or any other non-ionizing compound
  • liberation of a gaseous product.

Learn more:

Precipitation reaction brainly.com/question/1870098

19. ___Single displacement___ Fe + 2HCl  → FeCl₂  + H₂

In a single displacement reaction, one substance replaces another.

  • The replacement of a metallic ion in solution by a metal higher in the activity series than the metal in solution falls into this category.
  • The positions of the two elements in the activity series serves as the driving force.

Learn more:

Chemical reactions brainly.com/question/3953793

20. ___Synthesis___ CaO + H₂O  →  Ca(OH)₂

Synthesis is a combination reaction

  • This reaction involves the formation of a single product from two or more reactants.
  • A compound forms from the union of two or more reactants
  • The large and negative heat of formation of the product is the driving force for this reaction.

Learn more:

Synthesis brainly.com/question/2761166

21. ______Decomposition__ NiCl₂   →  Ni + Cl₂

In a decomposition or cracking reaction, two or more product forms from a single reactant.

The breakdown of a compound into its component individual elements or other compounds fall into this category.

  • The driving force for this reaction is the high heat of formation of the compound and the extreme instability of the compound.
  • A stable compound can also be decomposed on heating and applying pressure.

Learn more:

Thermal decomposition brainly.com/question/11181911

#learnwithBrainly

6 0
3 years ago
What physics concept is used when designing a motorcycle helmet to protect the head from injury
fomenos

Answer:

Explanation:

From the 1st Law of linear motion which states that when a body goes into motion, it will continue doing so until it is stopped by force. So the body of the rider keeps moving until it is been stopped and the stopping could be as a result of an impact of any part of the body which includes the head it an object. Also the 3rd Law of Motion will also be applicable because for every action, there will be equal and opposite reaction. The magnitude of the impact will be as a result of the force with which the crash took place as well.

When crashes take place the rider does not always experience a head impact square on with a solid obstruction. During a bike crash, your head comes in contact with the ground. The ground exerts a force that causes your head to stop moving. Often impact will be at an angle and may not be head first. It may be your shoulder will hit first, then your side, and then your head will receive a glancing blow against the ground as you slide.

The ground exerts so much force that it can stop our forward motion within seconds. Without your motorcycle helmet, your head experiences a huge amount of concentrated force during a crash.

3 0
2 years ago
Which example best demonstrates how unbalanced forces change the speed of an object's motion? A) A child on a bicycle braking at
SCORPION-xisa [38]
The answer would be A :)
5 0
3 years ago
Read 2 more answers
Why would an egg break immediately when it hits the ground?
Elza [17]

As an egg falls towards the floor, it begins to travel faster and faster. When it slams into the floor, the egg is stopped almost immediately. This force of the floor against the eggshell is too large, so it breaks.
6 0
3 years ago
Read 2 more answers
Other questions:
  • Think about the following statement Only communities located downstream in a watershed need to be concerned about how the water
    5·1 answer
  • Meteoroids are small objects in space, usually made of rock or metal. These bodies often get close to a planet and fall through
    12·1 answer
  • Please need some help on this
    6·1 answer
  • The very bottom of a body of water is called the___ zone
    14·1 answer
  • Two vectors A and B are directed such that there is an angle θ between them. show answer Incorrect Answer Which of the following
    15·1 answer
  • Are matter and weight the same thing?
    8·2 answers
  • A solid sphere with a moment of inertia of 2.20 kgm2 is rolling along the ground (without slipping) with an angular velocity of
    12·1 answer
  • Avg velocity definition | Problem Average velocity vectors…
    11·1 answer
  • If a ball is dropped off a tall building and accelerates at 9.8 m/s^2 until reaching the ground at a speed of 55 m/s, how long w
    7·1 answer
  • A projectile is fired in such a way that its horizontal range is equal to three times its maximum height. What is the angle of p
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!