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bagirrra123 [75]

3 years ago

12

Sound waves are also called compression waves. This means that as the wave travels through air, the ________ increases and decre

ases.
motion

light

pressure

energy

1 answer:

Nuetrik [128]3 years ago

3 0

I believe the answer is pressure. hope this helps

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Answer:

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Ф = -17° from + X axis or 343° from + X axis

Explanation:

v1 = 75 m/s 25° east of north

v2 = 100 m/s 25° east of south

Write the velocities in vector form ,we get

$\overrightarrow{v_{1}}=75\left ( Sin25\widehat{i} +Cos25\widehat{j}\right )=31.7\widehat{i}+67.97\widehat{j}$

$\overrightarrow{v_{1}}=100\left ( Sin25\widehat{i} -Cos25\widehat{j}\right )=42.26\widehat{i}-90.63\widehat{j}$

Now add the velocity vectors to get the resultant of the velocities.

$\overrightarrow{v}=\overrightarrow{v_{1}}+\overrightarrow{v_{2}}$

$\overrightarrow{v}=\left (31.7+42.26 \right )\widehat{i}+\left ( 67.97- 90.63 \right )\widehat{j}$

$\overrightarrow{v}=73.96\widehat{i}-22.66\widehat{j}$

magnitude of resultant velocity is $\sqrt{\left ( 73.96 \right )^{2}+\left ( -22.66 \right )^{2}}$

= 77.35 m / s

The direction is Ф from X axis

$tan\phi =\frac{-22.66}{73.96}=-0.306$

Ф = -17° from + X axis or 343° from + X axis

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