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
Svet_ta [14]
3 years ago
6

Captain hook orders peter pan to walk the plank from which he falls into the sea 18m below. Peter pan claims that his life flash

ed before his eyes during his fall. How much time is available for this?
Physics
2 answers:
Neporo4naja [7]3 years ago
6 0
You would use
d = v0*t + 0.5at^2
Solve for t. v0 is 0, d is 18 and a is -9.81

t = sqrt(18/4.9)
Nat2105 [25]3 years ago
3 0
The distance fallen through gravity in ' t ' seconds is

        Distance  =  (1/2) (acceleration of gravity) (t²)

           18 meters  =  (1/2) · (9.8 m/s²) · (t²)

Divide each side by (4.9 m/s²):

                           (18 m) / (4.9 m/s²)  =  t²

                                 3.67 sec²  =  t²

Square root each side:    1.92 sec  =  t  .    (rounded) 

That's not much time.  But Peter Pan never got old, so
presumably he hasn't got too much life to flash through. 
He may be OK with 1.92 seconds.  Maybe even enough
time to linger momentarily over some of the juicier parts.
You might be interested in
a student drops an object from the top of a building which is 19.6 m high. How long does it take the object to fall to the groun
zubka84 [21]

Here's a formula that's simple and useful, and if you're really in
high school physics, I'd be surprised if you haven't see it before. 
This one is so simple and useful that I'd suggest memorizing it,
so it's always in your toolbox.

This formula tells how far an object travels in how much time,
when it's accelerating:

               Distance = (1/2 acceleration) x (Time²).

                           D = 1/2 A T²

For your student who dropped an object out of the window,

     Distance = 19.6 m
     Acceleration = gravity = 9.8 m/s²

                                              D = 1/2 G T²

                                          19.6 =   4.9   T²

Divide each side by 4.9 :       4  =           T²

Square root each side:           2  =          T

When an object is dropped in Earth gravity,
it takes  2  seconds to fall the first 19.6 meters.

8 0
3 years ago
Read 2 more answers
What three things do cells / organisms have to do to maintain homeostasis? ____ from food, get rid of ____, and _____(mitosis/me
user100 [1]
1) use energy from food
2) get rid of wastes
3) maintain
5 0
3 years ago
The kinetic energy of a moving object is E=12mv2. A 61 kg runner is moving at 10kmh. However, her speedometer is only accurate t
jek_recluse [69]

Answer:

e=3367.2J

%e=1.43%

Explanation:

From the exercise we know two information. The real speed and the experimental measured by the speedometer

v_{r}=10km/h=2.77m/s

Since the speedometer is only accurate to within 0.1km/h the experimental speed is

v_{e}=10km/h-0.1km/h=9.9km/h=2.75m/s

Knowing that we can calculate Kinetic energy for the real and experimental speed

E_{r}=\frac{1}{2}mv^2=\frac{1}{2}(61000g)(2.77m/s)^2=234023J

E_{e}=\frac{1}{2}mv^2=\frac{1}{2}(61000g)(2.75m/s)^2=230656J

Now, the potential error in her calculated kinetic energy is:

e=E_{r}-E_{e}=(234023-230656)J=3367.2J

%e=\frac{E_{r}-E_{e}}{E_{r}}x100=\frac{(234023-230656)J}{234023J}x100=1.43%

4 0
3 years ago
What is the equation that defines work
mina [271]
Work=force*displacment
3 0
3 years ago
Which of the following statements are true about magnets?
timama [110]
The correct answer is 3
4 0
3 years ago
Other questions:
  • What is the definition for the word energy?​
    13·1 answer
  • Can fatigue seriously impair driving ability
    10·2 answers
  • The method of heat transfer by which the sun warms the earth is
    7·2 answers
  • Hey guys.Help me Please!!!! 20 senteces. People can look at the world from different points of view HUMANISM INDIVIDUALISM Expla
    13·1 answer
  • Differences Between light year and astronomical unit in two points .
    11·1 answer
  • Archimedes supposedly was asked to determine whether a crown made for the king consisted of puregold. According to legend, he so
    12·1 answer
  • I dont understand physics.
    11·1 answer
  • During radioactive decay, ___ energy was transformed to ____
    11·1 answer
  • If something changes motion, are forces balanced or unbalanced?
    6·2 answers
  • The game in the suburbs and rural areas of the Philippines is/are called_____?? ​
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!