2 years ago

Which type of surface is best for absorbing sound waves?

Physics

2 answers:

sergiy2304 [10]2 years ago

6 0

I think it's B (foam) it may not be though

weeeeeb [17]2 years ago

4 0

I believe it is D) foam

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A 5.7 kg block attached to a spring executes simple harmonic motion on a frictionless horizontal surface. At time t = 0s, the bl

Genrish500 [490]

Answer:

Explanation:

Given

mass of block $m=5.7\ kg$

at $t=0 s$

displacement is $x=-0.7\ m$

velocity $v=-0.8\ m/s$

acceleration $a=2.7\ m/s^2$

suppose $x=A\cos (\omega t+\phi )$ is the general equation of SHM

where A=amplitude

$\omega$ =natural frequency of oscillation

therefore velocity and acceleration is given by

$v=-A\omega \sin (\omega t+\phi )$

$a=A\omega ^2\cos (\omega t+\phi )$

for t=0

$-0.7=A\cos (\phi )---1$

$v=-0.8=-A\omega \sin(\phi)---2$

$a=2.7=-A\omega ^2\cos(\phi )----3$

divide 1 and 3 we get

$\omega ^2=\frac{27}{7}$

$\omega =\sqrt{\frac{27}{7}}$

Now square and 1 and 2 we get

$(0.7)^2+(\frac{0.8}{\omega })^2=A^2$

$A^2=0.49+0.166$

$A=0.81\ m$

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3 years ago

A ball is thrown vertically upward with a speed of 12.0 m/s. (<br> a. How high does it rise?

sdas [7]

It rises till all of its Kinetic energy is converted into potential energy.

so, mgh=(1/2)m(v^2)

so, h=(v^2)/2g = 12*12/(2*9.81)=7.34 m

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3 years ago

Please help do not guess

Georgia [21]

Answer:

358.9 (+/- 0.4) million years ago

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Explanation:

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3 years ago

The maximum amount of pulling force a truck can apply when driving on

kupik [55]

C the correct but not sure?

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3 years ago

According to newtons third law, the two forces in a force pair act

aliina [53]

B- Same force

It’s b because force always acts in equal but opposite pairs.

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3 years ago