3 years ago

Is a sound wave mechanical or an electromagnetic wave

Physics

1 answer:

NNADVOKAT [17]3 years ago

7 0

It is a mechanical wave and cannot travel through a vacuum.

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A tsunami covers a distance of 500km in 83.3 minutes. If the period of vibration of the molecules is 35.0 minutes, what is the w

marin [14]

Answer:

210079.798 m

Explanation:

pls give brainliest :)

8 0

3 years ago

A proton initially has v=4.0i^−2.0j^+3.0k^ and then 4.0 s later has v=−2.0i^−2.0j^+5.0k^ (in meters per second). For that 4.0 s,

pishuonlain [190]

Answer:

$a_{avg}=-1.5i+0.5k$

$1.58113883008\ m/s^2$

$-18.43^{\circ}\ or\ 161.57^{\circ}$

Explanation:

u = 4.0i−2.0j+3.0k v = −2.0i−2.0j+5.0k

Average acceleration is given by

$a=\dfrac{v-u}{t}\\\Rightarrow a=\dfrac{-2-4, -2+2, 5-3}{4}\\\Rightarrow a=-1.5i-0j+0.5k$

$a_{avg}=-1.5i+0.5k$

The magnitude is

$a_{avg}=\sqrt{(-1.5)^2+0.5^2}\\\Rightarrow a_{avg}=1.58113883008\ m/s^2$

The magnitude is $1.58113883008\ m/s^2$

The angle is

$\theta=tan^{-1}\dfrac{a_z}{a_x}\\\Rightarrow \theta=tan^{-1}\dfrac{0.5}{-1.5}\\\Rightarrow \theta=-18.43^{\circ}\ or\ 161.57^{\circ}$

The angle between $a_{avg}$ and the positive direction of the x axis is $-18.43^{\circ}\ or\ 161.57^{\circ}$

4 0

3 years ago

A car moves with the speed of 40km/hr for the first half distance and 60km/hr for second half distance.find average speed of car

slava [35]

Answer:

50km/h

Explanation:

average = (a + b) / 2

average = (60 + 40) / 2

average = 50

7 0

2 years ago

A 1400-kg rocket has a net propulsion force of 20 kN (kiloNewtons). Over a short time period, it uniformly speeds up from an ini

zubka84 [21]

Answer:

W = 8.92 10² kJ

Explanation:

For this exercise they give us the strength, we must calculate the distance traveled, for this we need the rocket acceleration let's use Newton's second law

F = m a

a = F / m

a = 20 103/1400

a = 14.29 m/s²

With kinematics we can find the distance traveled

$v_{f}$ ² = v₀² + 2 a x

x = ( $v_{f}$ ²-v₀²) / 2 a

x = (50² -35²) / 2 14.29

x = 1275 / 28.58

x = 44.61 m

Let's calculate the work

W = F.d

The bold is vector; as indicated by the force is in the direction of movement the scalar product is reduced to the ordinary product

W = F d

W = 20 10³ 44.61

W = 8.92 10⁵ J

W = 8.92 10² kJ

6 0

3 years ago

What are the primary functions of

ycow [4]

C.Provide Structural Support.

hope this helps.

7 0

3 years ago

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