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2 years ago

11

At take off, a plane flies 100 km north before turning to fly 200 km east. How far is its destination from where the plane took

off?
Question 3 options:

300 km

224 km

200 km

173 km

1 answer:

Snowcat [4.5K]2 years ago

4 0

The answer is 300 km

To the destination

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How are longitudinal and transverse waves different?

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2 years ago

19) A child on a sled starts from rest at the top of a 15.0° slope. If the trip to the bottom takes 15.2 s,

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Answer: 288.8 m

Explanation:

We have the following data:

$t=15.2 s$ is the time it takes to the child to reach the bottom of the slope

$V_{o}=0$ is the initial velocity (the child started from rest)

$\theta=15\°$ is the angle of the slope

$d$ is the length of the slope

Now, the Force exerted on the sled along the ramp is:

$F=ma$ (1)

Where $m$ is the mass of the sled and $a$ its acceleration

In addition, if we draw a free body diagram of this sled, the force along the ramp will be:

$F=mg sin \theta$ (2)

Where $g=9.8 m/s^{2}$ is the acceleration due gravity

Then:

$ma=mg sin \theta$ (3)

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$a=g sin \theta$ (4)

$a=9.8 m/s^{2} sin(15\°)$ (5)

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$V^{2}=V_{o}^{2}+2ad$ (8)

Where $V$ is the final velocity

Finding $V$ from (7):

$V=at=(2.5 m/s^{2})(15.2 s)$ (9)

$V=38 m/s$ (10)

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$(38 m/s)^{2}=2(2.5 m/s^{2})d$ (11)

Finding $d$ :

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2 years ago

A vibrating object produces periodic waves with a wavelength of 53 cm and a frequency of 15 Hz. How fast do these waves move awa

DerKrebs [107]

Answer:

v = 7.95 m/s

Explanation:

Given that,

Wavelength of a wave, $\lambda=53\ cm=0.53\ m$

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2 years ago