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
Gemiola [76]
3 years ago
15

The photo shows a bungee jumper falling towards the sky,

Biology
2 answers:
mart [117]3 years ago
7 0

Answer:

C.

Explanation:

the faster he falls the more velocity he picks up which means he's going faster

Fofino [41]3 years ago
5 0

Answer:

C His velocity increases.

Explanation:

The first force that the bungee jumper experiences is gravity, which pulls down on everything and makes the jumper fall. The gravitational force is almost exactly constant throughout the jump.

During the bungee jumper's fall, he or she also experiences a force due to air resistance. The faster the jumper is falling, the more the air resistance pushes back opposite to the direction of motion through the air.

The third force the jumper experiences is a spring force due to the bungee cord. The amount that the bungee cord pulls back on the jumper depends on how far the cord has been stretched, i.e. the farther the jumper has fallen, the more the cord pulls back on him or her. Below a certain height, the spring force of the bungee cord pulling up on the jumper exceeds the force of gravity pulling down. In that range, even ignoring the air resistance, the fall slows down, and then starts to reverse, so the jumper heads back up.  

Now that you know about the forces, let's look at the work that is done on the jumper. Each little bit of work done on the jumper changes their kinetic energy, mv2/2, where m is their mass and v is their velocity. you calculate that work by multiplying the distance traveled times the component of the force in that direction. You can have negative work if the force and direction of motion are opposite to each other.

So now let's look at the first fall that the jumper makes. As the jumper falls down, gravity does positive work because the force of gravity points in the same direction that the jumper falls in. The spring force of the bungee cord, however, does negative work on the jumper because the jumper is falling down while the cord is pulling up. The third force, air resistance, also does negative work during the fall since it pushes upwards. As the jumper reverses direction and starts to spring back up, gravity does negative work because the gravitational force pulls down while the jumper is moving up. The spring force does positive work this time because it is in the same direction as the jumper's motion. However, air resistance still does negative work because now it pushes down on the jumper.

Now to finish off, let's look at the energy in this situation. There are three types of energy here: potential energy of gravity and in the stretched cord, kinetic energy of the jumper, and thermal (heat) energy of the air and other things. Gravitational potential energy depends on how high of the ground you are, e.g. if you hold a book above your head, that book has more potential energy than a book that is sitting on the ground. The potential energy of the bungee cord depends on how much the cord has been stretched, i.e. the bungee cord has more potential energy when it is stretched out than when it is slack. Kinetic energy depends on how fast you are moving, as we mentioned. One of the most important equations in physics is the work-energy equation.

If there weren't any air resistance, then we'd have a pretty simple result, because the potential + kinetic energy wouldn't change. At the top of the fall the jumper isn't moving, so the kinetic energy is zero. The gravitational potential energy there is large. At the bottom of the fall, again for an instant the jumper isn't moving and the kinetic energy is zero. There the gravitational potential energy has gone down, but the bungee cord potential energy has gone up so much that the total potential energy is back to the starting value. In between, the jumper has kinetic energy, so the gain of potential energy by the cord in that range isn't enough to make up for the loss of gravitational potential energy.  Basically energy gets exchanged back and forth during the jump, and if air resistance were not present, the bungee jumper's total energy would remain constant and he or she would continue boinging up and down forever.

However, you know very well that this is not the case! So now let's take a look at air resistance and its effects on the bungee jumper. y. Air resistance is the main reason that the bungee jumper, on his or her way back up to the top, never quite reaches the place that he or she started the jump from. In fact, as the jumper bounces up and down, each time his or her maximum height gets less and less. This is similar to a ball that bounces lower and lower until it stops bouncing at all. This is because air resistance is working against the bungee jumper (and the bouncy ball) both on the way down and on the way up, i.e. it always does  types of friction here too. As the cord stretches and pulls back, there's some friction inside the cord itself.  So even without air, the energy would gradually get dumped into heat.

You might be interested in
Describe how the same signal molecule (i.e., a hormone or neurotransmitter) can induce different types of effects in different c
Leto [7]

Answer:

it Changes according to the receptor.

Explanation:

Every cell has different receptors in the membrane, these receptors are specific, but different receptors can read one signal molecule, according to the receptor, this molecule can activate or inactivate different path ways.

Let me put it this way, if I give the same message to a botanist and a gardener they both are going to read it in different way even knowing it is the same.

6 0
3 years ago
What is the difference between primary & secondary succession? *
r-ruslan [8.4K]

Primary succession: <u>is a process by which a community arises in a virtually lifeless area with no soil. </u>

Secondary succession:<u> follows a disturbance that destroys a community without destroying the soil.</u>

6 0
2 years ago
Read 2 more answers
The law of _____explains how alleles separate during gamete formation.
Elan Coil [88]
This is Mendels Law of Segregation
5 0
3 years ago
Read 2 more answers
Please answer the following questions correctly​
Oksi-84 [34.3K]

Answer:

i.   Name each of the parts labelled I, II, III, IV and V.

                           {5 marks}

I - Crown / Enamel

II - Dentine

III - Cement / Periodontal membrane

IV - Jaw bone / Root

V - Pulp Cavity

ii   What is the function of each of the parts labelled I and III?

                    {2 marks}

I - Protects teeth from harmful bacteria

-- Enable teeth withstand pressure of chewing

-- Cutting / chewing / protects dentine / protect pulp cavity

III - hold tooth firmly (in socket / Jaw bone)

iii  Which of the labelled parts could be affected by tooth decay?

                                   {1 mark}

V - Pulp cavity

iv  State three ways by which tooth decay may be prevented.

                      {3 marks}

→ avoid using sharp-pointed objects

→ avoid having dry mouth

→ use water containing fluorides to wash teeth / mouth

→ avoid smoking

→ the teeth should be cleaned regularly after each meal / remove food particle from the teeth / flossing

→ wash the mouth vigorously after each meal

→ regular visit to the dentist

→ avoid eating too hot foods

→ avoid eating too much sugary food

→ avoid eating too cold food / taking too cold drinks

Explanation:

6 0
2 years ago
Will Dallas Texas be warmer or cooler than Charleston South Carolina in the winter
ioda

I think dallas texas would be warmer.

6 0
3 years ago
Other questions:
  • Which best describes the structure of DNA?
    7·1 answer
  • A carrier is a person who has
    13·1 answer
  • What are three characteristics that these biomes have in common?
    13·1 answer
  • Which terms complete the sentence given below?
    5·1 answer
  • The energy that is used by almost all living things on our planet comes from the sun. it is captured by plants, algae, and some
    7·1 answer
  • A point mutation that does not result in a change to the amino acid coded for is said to be a _______ mutation. Nonsynonymous sy
    9·1 answer
  • What do centromeres attach to during metaphase
    6·1 answer
  • CAN someone please help asap
    15·1 answer
  • What do you think of when you hear the word heat?
    10·2 answers
  • What would happen if you change part of food chain
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!