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3 years ago

Why do you see lightning before you hear thunder

1 answer:

5 0

Answer: When a lightning bolt travels from the cloud to the ground it actually opens up a little hole in the air, called a channel. Once then light is gone the air collapses back in and creates a sound wave that we hear as thunder. The reason we see lightning before we hear thunder is because light travels faster than sound!

Explanation:

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The behaviors that light exhibits are reflection, refraction, diffraction, polarization, and dispersion. Answer

Molodets [167]

I believe the correct answer is false. The behaviors that light exhibits are reflection, refraction, diffraction but not polarization, and dispersion. Light<span> behaves as a wave - it undergoes reflection, refraction, and diffraction just like any wave would. Hope this answers the question.</span>

5 0

4 years ago

Which of these objects absorbs most of the light that strikes it?

Vinvika [58]

A black sweater. Why? Because black is the most absorbent color while as white is reflecting the light. Hope this helps...

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4 years ago

El motor de una licuadora gira a 3600 rpm, disminuye su velocidad angular hasta 2000 rpm realizando 120 vueltas. Calcular: a) La

allsm [11]

Answer:

a) α = -65,2 rad/s².

b) t = 2,57 s.

Explanation:

a) La aceleración angular se puede calcular usando la siguiente ecuación:

$\omega_{f}^{2} = \omega_{0}^{2} + 2\alpha \theta$

En donde:

$\omega_{f}$ : es la velocidad angular final = 2000 rpm = 209,4 rad/s

$\omega_{0}$ : es la velocidad angular inicial = 3600 rpm = 377,0 rad/s

α: es la aceleración angular=?

θ: es el desplazamiento o número de vueltas = 120 rev = 754,0 rad

Las conversiones de unidades se hicieron sabiendo que 1 revolución = 2π radianes y que 1 minuto = 60 segundos.

Resolviendo la ecuación (1) para α, tenemos:

$\alpha = \frac{\omega_{f}^{2} - \omega_{0}^{2}}{2\theta} = \frac{(209,4 rad/s)^{2} - (377,0 rad/s)^{2}}{2*754,0 rad} = -65,2 rad/s^{2}$

Entonces, la aceleración angular es -65,2 rad/s². El signo negativo se debe a que el motor está desacelerando.

b) El tiempo transcurrido se puede encontrar como sigue:

$\omega_{f} = \omega_{0} + \alpha t$

Resolviendo para t, tenemos:

$t = \frac{\omega_{f} - \omega_{0}}{\alpha} = \frac{209,4 rad/s - 377,0 rad/s}{-65,3 rad/s^{2}} = 2,57 s$

Por lo tanto, el tiempo transcurrido fue 2,57 s.

Espero que te sea de utilidad!

3 0

3 years ago

look at picture, need to know net force, whether they are balanced or unbalanced and whether they are accelerated or not acceler

AlexFokin [52]

Not a clear pic sorry i can't help

3 0

3 years ago

Two students of equal weight go from the first floor to the second floor. The first student uses an elevator and the second stud

Reil [10]

Answer: Option 3: THE SAME

Explanation:

The gravitational potential at a point or location is equal to the work per unit mass of a certain body that would be needed to move the body to that point from a reference point or location. The gravitational potential of both the first student that used the elevator and the second student that used the stairs are THE SAME because they both moved from referenced location (first floor) to the other location(second floor) and work is done per unit mass.

8 0

3 years ago