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almond37 [142]
4 years ago
7

How much time does it take a pulse of light to travel through 150 m of water?

Physics
1 answer:
jenyasd209 [6]4 years ago
3 0

Answer:

 6.65×10⁻⁷ s

Explanation:

Speed of light in water = Total distance traveled in water/time

c = d/t ....................... Equation 1

Where c = speed of the light pulse in water, d = distance traveled in water, t = time.

also

c = v/n ..................... Equation 2

Where v = speed of light in air, n = refractive index of water

Substituting equation 2 into equation 1

v/n = d/t

making t the subject of the equation,

t = nd/v.................. Equation 3

Given: 150 m.

Constant: n = 1.33, v = 3.0×10⁸ m/s

Substitute into equation 3

t = 1.33(150)/3.0×10⁸

t = 6.65×10⁻⁷ seconds.

Hence the time =  6.65×10⁻⁷ s

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A basketball player jumps straight upward. After 0,625 s, she is 0.441 m above the ground. What is her initial velocity?????????
Lunna [17]

Answer:

v₀ = 3.77 [m/s]

Explanation:

This problem can be solved in a simple way by means of the following equation of kinematics.

y=y_{o}+v_{o}*t+\frac{1}{2}*g*t^{2}

where:

y - yo = 0.441 [m]

Vo = initial velocity [m/s]

g = gravity acceleration = 9.81 [m/s²]

t = time = 0.625 [s]

0.441 = v_{o}*(0.625)-\frac{1}{2} *9.81*(0.625)^{2} \\2.357 = v_{o}*0.625\\v_{o}=3.77[m/s]

Note: The sign of the acceleration is negative since the movement of the basketball player is against of the gravity acceleration.

4 0
3 years ago
La velocidad de un tren se reduce uniformemente de 12m/s a 5m/s. Sabiendo que durante ese tiempo recorre una distancia de 100 m.
KATRIN_1 [288]

Responder:

Explicación:

Dados los siguientes datos

Valor inicial u = 12 m / s

velocidad final v = 5 m / s

Distancia S = 100 m

Necesario

aceleración del tren.

Usando la ecuación de movimiento

v² = u² + 2as

2as = v²-u²

a = v²-u² / 2s

Sustituyendo los valores dados para obtener la aceleración que tenemos;

a = 5²-12² / 2 (100)

a = 25-144 / 200

a = -119/200

a = -0,595 m / s²

Por tanto, la aceleración del tren durante este período es de -0,595 m / s²

b) Si el tren viaja a una parada desde 5 m / s, su velocidad final será cero y su velocidad inicial u será 5 m / s

Para obtener la distancia durante este período, sustituiremos u = 5 m / s, v = 0 m / sy a = -1,19 m / s² en la ecuación de movimiento anterior;

v² = u² + 2as

0² = 5²-2 (0.595) s

0 = 25-1,19 s

1,19 s = 25

s = 25 / 1,19

Responder:

Explicación:

Dados los siguientes datos

Valor inicial u = 12 m / s

velocidad final v = 5 m / s

Distancia S = 100 m

Necesario

aceleración del tren.

Usando la ecuación de movimiento

v² = u² + 2as

2as = v²-u²

a = v²-u² / 2s

Sustituyendo los valores dados para obtener la aceleración que tenemos;

a = 5²-12² / 2 (100)

a = 25-144 / 200

a = -119/200

a = -0,595 m / s²

Por tanto, la aceleración del tren durante este período es de -0,595 m / s²

b) Si el tren viaja a una parada desde 5 m / s, su velocidad final será cero y su velocidad inicial u será 5 m / s

Para obtener la distancia durante este período, sustituiremos u = 5 m / s, v = 0 m / sy a = -1,19 m / s² en la ecuación de movimiento anterior;

v² = u² + 2as

0² = 5²-2 (0.595) s

0 = 25-1,19 s

1,19 s = 25

s = 25 / 1,19

s = 21,0 m

Por lo tanto, la distancia que recorre hasta detenerse asumiendo la misma aceleración es 21.0 m

3 0
3 years ago
Need help ASAP!!! Please!!!!
Paraphin [41]

Answer:

B I think

Explanation:

hope this helped!

7 0
2 years ago
Read 2 more answers
What is wave interactions? ​
Thepotemich [5.8K]

Answer:

Waves interact with matter in several ways. The interactions occur when waves pass from one medium to another. The types of interactions are reflection, refraction, and diffraction. Each type of interaction is described in detail below.

6 0
3 years ago
A 1 500-kg car rounds an unbanked curve with a radius of 52 m at a speed of 12.0 m/s. What minimum coefficient of friction must
Sergio039 [100]

Explanation:

The centripetal force F_c on the car must equal the frictional force f in order to avoid slipping off the road. Let's apply Newton's 2nd law to the y- and x-axes.

y:\:\:\:\:N - mg = 0

x:\:\:F_c = f \Rightarrow \:\:\:m \dfrac{v^2}{r} = \mu N

or

m \dfrac{v^2}{r} = \mu mg

Solving for \mu,

\mu = \dfrac{v^2}{gr} = \dfrac{(12.0\:\frac{m}{s})^2}{(9.8\:\frac{m}{s^2})(52\:m)} = 0.28

3 0
3 years ago
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