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Yanka [14]
4 years ago
5

Which statements correctly characterize a lunar eclipse? Select all that apply.

Physics
1 answer:
Zepler [3.9K]4 years ago
6 0

A) it occurs when earth is between the sun and the moon

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59. (II) The crate shown in Fig. 4-60 lies on a plane tilted at an angle A = 25.0° to the horizontal, with Mk 0.19. (a) Determin
Daniel [21]

Explanation:

a) We need to write down first Newton's 2nd law as applied to the given system. The equations of motion for the x- and y-axes can be written as follows:

x:\;\;\;\;\;mg\sin 25° - \mu_kN = ma\;\;\;\;\;\;(1)

y:\;\;\;\;\;N - mg\cos 25° = 0\;\;\;\;\;\;\;\;\;(2)

From Eqn(2), we see that

N = mg\cos 25°\;\;\;\;\;\;\;(3)

so using Eqn(3) on Eqn(1), we get

mg\sin 25° - \mu_kmg\cos 25° = ma

Solving for the acceleration, we see that

a = g(\sin 25° - \mu_k\cos 25°)

\;\;\;\;= 2.45\:\text{m/s}^2

b) Now that we have the acceleration, we can now solve for the velocity of the crate at the bottom of the plane. Using the equation

v^2 = v_0^2 + 2ax

Since the crate started from rest, v_0 = 0. Thus our equation reduces to

v^2 = 2ax \Rightarrow v = \sqrt{2ax}

v = \sqrt{2(2.45\:\text{m/s}^2)(8.15\:\text{m})}

\;\;\;\;= 6.32\:\text{m/s}

6 0
3 years ago
Una pelota se desliza hacia arriba por una pendiente se halla inicialmente a 6m de la parte más baja de dicha pendiente y tiene
jolli1 [7]

Answer:

a) vprom = - 0.6 [m/s] b) ver explicacion c) vf = 10.8 [m/s]

Explanation:

Para poder solucionar este problema debemos completar el enunciado del problema así como la pregunta, realizando una búsqueda en Internet encontramos el enunciado completo, así como la pregunta.

"Una pelota que se desliza hacia arriba por una pendiente se halla inicialmente a 6 m de la parte más baja de dicha pendiente y tiene una velocidad de 4 m/s. Cinco segundos después se encuentra a 3 m de la parte más baja. Si suponemos una aceleración constante, "

¿cual fue la velocidad media?

¿Cuál es el significado de una velocidad media negativa?

¿Cuáles son la aceleración media y la velocidad final?

Para facilitar esta solución debemos realizar un esquema del movimiento de la pelota en el plano inclinado. En la imagen adjunta se puede ver un esquema del movimiento de la pelota sobre el plano inclinado en los diferentes tiempos mencionados.

<u>¿cual fue la velocidad media?</u>

<u />

La velocidad media se debe calcular utilizando la expresión de velocidad = espacio / tiempo.

v_{prom}=x/t\\v_{prom}=(3-6)/5\\v_{prom}=-0.6 [m/s]

<u>¿Cuál es el significado de una velocidad media negativa? </u>

La velocidad media negativa significa que se dirige hacia abajo en sentido contrario

<u>¿Cuáles son la aceleración media y la velocidad final?</u>

<u />

x=v_{o}*t+0.5*a*t^{2} \\-3=(4)*(5)+0.5*a*(5)^2\\a=1.36[m/s^2]\\\\Velocity\\v_{f}=v_{o}+a*t = 4+(1.36*5)\\v_{f}=10.8[m/s]

6 0
3 years ago
Someone please help
Vaselesa [24]

Answer:

hi there!!

Explanation:

Nickel  149 pm

Cobalt  152 pm

Calcium  194 pm

Potassium  243 pm

So Potassium is the correct answer

6 0
3 years ago
Which statement is supported by the information in the diagram and table below?
Natasha_Volkova [10]

Answer:

a

Explanation:

a

5 0
3 years ago
Will Upvote!!!
katrin2010 [14]
The answer is A. Since the car is moving at a constant velocity, the car not accelerate no matter how far it travels.
5 0
3 years ago
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