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
mote1985 [20]
3 years ago
5

A dolphin in an aquatic show jumps straight up out of the water at a velocity of 15.0 m/s. (a) List the knowns in this problem.

(b) How high does his body rise above the water? To solve this part, first note that the final velocity is now a known, and identify its value. Then, identify the unknown and discuss how you chose the appropriate equation to solve for it. After choosing the equation, show your steps in solving for the unknown, checking units, and discuss whether the answer is reasonable. (c) How long a time is the dolphin in the air? Neglect any effects resulting from his size or orientation.
Physics
1 answer:
astra-53 [7]3 years ago
5 0

Answer:

a)

Y0 = 0 m

Vy0 = 15 m/s

ay = -9.81 m/s^2

b) 7.71 m

c) 3.06 s

Explanation:

The knowns are that the initial vertical speed (at t = 0 s) is 15 m/s upwards. Also at that time the dolphin is coming out of the water, so its initial position is 0 m. And since we can safely assume this happens in Earth, the acceleration is the acceleration of gravity, which is 9.81 m/s^2 pointing downwards

Y(0) = 0 m

Vy(0) = 15 m/s

ay = -9.81 m/s^2 (negative because it points down)

Since acceleration is constant we can use the equation for uniformly accelerated movement:

Y(t) = Y0 + Vy0 * t + 1/2 * a * t^2

To find the highest point we do the first time derivative (this is the speed:

V(t) = Vy0 + a * t

We equate this to zero

0 = Vy0 + a * t

0 = 15 - 9.81 * t

15 = 9.81 * t

t = 0.654 s

At this time it will have a height of:

Y(0.654) = 0 + 15 * 0.654 - 1/2 * 9.81 * 0.654^2 = 7.71 m

The doplhin jumps and falls back into the water, when it falls again it position will be 0 again. So we can equate the position to zero to find how long it was in the air knowing that it started the jump at t = 0s.

0 = Y0 + Vy0 * t + 1/2 * a * t^2

0 = 0 + 15 * t - 1/2 * 9.81 t^2

0 = 15 * t - 4.9 * t^2

0 = t * (15 - 4.9 * t)

t1 = 0 This is the moment it jumped into the air

0 = 15 - 4.9 * t2

15 = 4.9 * t2

t2 = 3.06 s This is the moment when it falls again.

3.06 - 0 = 3.06 s

You might be interested in
Why are peer reviews important?
riadik2000 [5.3K]
Peer review is important because it is used by scientists to decided which results should be published in a scientific journal
8 0
3 years ago
Read 2 more answers
Explain how a current is induced in the wire?
Nastasia [14]

Answer:

If a coil of wire is placed in a changing magnetic field, a current will be induced in the wire. This current flows because something is producing an electric field that forces the charges around the wire. (It cannot be the magnetic force since the charges are not initially moving). ... that determines the induced current.

8 0
3 years ago
Which of the following statements concerning the nuclear force is false? O The nuclear force is attractive and not repulsive. O
Ulleksa [173]

Answer:

  • The nuclear force is attractive and not repulsive.
  • The nuclear force is very weak and much smaller in relative magnitude than the electrostatic and gravitational forces.

Explanation:

  • Nuclear force is the strongest existing force in the nature.
  • It has the shortest range.
  • Its main function is to hold the subatomic particles together in nature.
  • The nuclear force is created  by the exchange of pi mesons between the nucleons of an atom, but for this exchange to happen the particles must be close to one another of the order of few femtometer.
  • At about 1 femtometer the nuclear force is very strongly attractive in nature but at distance greater than 2.5 femtometer it fades away.
  • The force becomes repulsive in nature at distance less than 0.7 femtometer.
  • This force holds the likely charged protons together in the nucleus.

3 0
3 years ago
Which of the following types of pollution is NOT linked to coal-burning power plant emissions?
Vika [28.1K]
A is not linked. Coal burning is not an effect of acid rain.
~Deceptiøn
8 0
3 years ago
PLEASE HELP ME
pogonyaev

Answer:

The answer is Insulator, Conductor

Explanation:

A/An Insulator is a material in which charges will not move easily, whereas a/an Conductor is a material that allows charges to move about easily

5 0
2 years ago
Other questions:
  • Sandra is having difficulty with her reading assignment because she does not fully understand the language. Which online tool wo
    10·2 answers
  • Determine the number of unpaired electrons in the octahedral coordination complex [fex6]3–, where x = any halide.
    14·1 answer
  • Kiko writes a roport to compare and contrast the code of plants and animals. Which of the following statements is accurato arvd
    7·1 answer
  • Provide the answers to the following questions.
    7·1 answer
  • A block of mass 2 kg is placed on the floor. The coefficient of static friction is 0.4. A horizontal force of 2.5 N is applied o
    15·1 answer
  • How did the social structure of ancient Rome affect the lives of its people?
    12·1 answer
  • 1000 kg car takes travels on a circular track having radius 100 m with speed 10 m/s. What is the magnitude of the centripetal fo
    13·1 answer
  • 8459299
    9·1 answer
  • Do this work if someone give correct answer I make her brainliest do this worksheet please
    9·1 answer
  • A person in his motorboat travels from his home to his work. It travels 50 m in a direction 60 degrees north of east. He then tu
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!