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Svet_ta [14]
4 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]4 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]4 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.
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KengaRu [80]

Answer:

225 rpm

Explanation:

The angular acceleration of the fan is given by:

\alpha = \frac{\omega_f - \omega_i}{\Delta t}

where

\omega_f is the final angular speed

\omega_i is the initial angular speed

\Delta t is the time interval

For the fan in this problem,

\omega_i = 0\\\omega_f = 180 rpm\\\Delta t=4 s

Substituting,

\alpha = \frac{180-0}{4}=45 rpm/s

Now we can find the angular speed of the fan at the end of the 5th second, so after t = 5 s. It is given by:

\omega' = \omega_i + \alpha t

where

\omega_i = 0\\\alpha = 45 rpm/s\\t = 5 s

Substituting,

\omega' = 0 + (45)(5)=225 rpm

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True great job
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