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3 years ago

Help me please !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Physics

2 answers:

Vitek1552 [10]3 years ago

4 0

C, due to stuff and whatnot

nirvana33 [79]3 years ago

4 0

Its either (C) or (D)

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When an object of mass m1 is hung on a vertical spring and set into vertical simple harmonic motion, its frequency is 12Hz. When

anzhelika [568]

Answer:

Explanation:

Given

When $m_1$ mass is attached to the spring its frequency is $f_1=12\ Hz$

when another mass $m_2$ is attached to $m_1$ , frequency changes to $f_2=4\ Hz$

frequency of spring mass system is given by

$f=\frac{1}{2\pi }\sqrt{\frac{k}{m}}$

for $m_1$

$f_1=\frac{1}{2\pi }\sqrt{\frac{k}{m_1}}$

$12=\frac{1}{2\pi }\sqrt{\frac{k}{m_1}}-----1$

for $m_1$ and $m_2$

$f_2=\frac{1}{2\pi }\sqrt{\frac{k}{m_1+m_2}}$

$4=\frac{1}{2\pi }\sqrt{\frac{k}{m_1+m_2}}----2$

divide 1 and 2

$3=\sqrt{\frac{m_1+m_2}{m_1}}$

squaring

$9=1+\frac{m_2}{m_1}$

$\frac{m_2}{m_1}=8$

8 0

3 years ago

Pls help for brainliest:)

Rasek [7]

Answer:

Explanation:

<h3>#CARRY ON LEARNING</h3><h3>#MARK ON LEARNING</h3><h3>#HELPING HAND</h3>

6 0

3 years ago

Si una bala de 122 g que viaja a 350 m/s golpea a un policía con chaleco antibalas el cual soporta 120 J de energía, ¿la bala at

Zanzabum

Answer:

Puesto que la energia cinética traslacional es mucho mayor que la capacidad del chaleco antibalas, la bala atravesaría el chaleco antibalas.

Explanation:

Un chaleco antibalas soporta el disparo de una bala disipando la energía de esta última a través de su propio material. Si sabemos que el chaleco antibalas soporta 120 joules de energía, cabe saber si la energía cinética traslacional es igual o inferior a ese límite, significando que la bala no atravesaría el chaleco.

La energía cinética traslacional de la bala ( $K$ ), in joules, queda expresada con la siguiente fórmula:

$K = \frac{1}{2}\cdot m\cdot v^{2}$ (1)

Donde:

$m$ - Masa de la bala, en kilogramos.

$v$ - Rapidez de la bala, en metros por segundo.

Si sabemos que $m = 0.122\,kg$ y $v = 350\,\frac{m}{s}$ , entonces la energía cinética traslacional de la bala es:

$K = 7472.5\,J$

Puesto que la energia cinética traslacional es mucho mayor que la capacidad del chaleco antibalas, la bala atravesaría el chaleco antibalas.

4 0

3 years ago

Imagine that a loudspeaker is producing a quiet note with a low pitch. How will its vibrations change:

borishaifa [10]

Answer:

See below

Explanation:

Higher pitch mens higher frequecy of vibrations

louder means more amplitude of vibrations (stronger vibrations)

3 0

2 years ago

Holly puts a box into the trunk of her car. Later, she drives around an unbanked curve that has a radius of 48 m. The speed of t

Troyanec [42]

Answer:

The minimum coefficient of static friction for the box on the floor of the trunk is 0.54.

Explanation:

Given that,

Radius of the unbanked curve, r = 48 m

The speed of the car on the curve, v = 16 m/s

We need to find the minimum coefficient of static friction for the box on the floor of the trunk. It can be calculated by balancing the centripetal force and the force of gravity as :

$\mu mg=\dfrac{mv^2}{r}$

$\mu=\dfrac{v^2}{rg}$

$\mu=\dfrac{(16)^2}{48\times 9.8}$

$\mu=0.54$

So, the minimum coefficient of static friction for the box on the floor of the trunk is 0.54. Hence, this is the required solution.

5 0

4 years ago