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3 years ago

6

Plz help plzzzzzzzzzzzzz i will give brainliest

1 answer:

AlexFokin [52]3 years ago

7 0

Answer:

1) D

Explanation:

You have to use a consistent air speed to play the trumpet correctly

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Some examples of solar ejections

mylen [45]

Coronal Mass ejections or Solar ejections are activities on the surface of the sun termed to the reaction of the gas composition of the sun's surface attributing to explosion of these gases. One example most commonly known as Solar Flares, and another example is termed as erupting prominence.

8 0

4 years ago

A freight train has a mass of 1.5 X 10^7 kg. If the

Elena L [17]

Answer:

t=444.4s

Explanation:

m=1.5*10^7 kg

F=7.5*10^5 N

v=80km/h*(1h/3600s)*(1000m/1km)=22.22m/s

<u>Second Newton's Law:</u>

F=ma

a=F/m=7.5*10^5/(1.5*10^7)=0.05m/s^2

<u>Kinematics equation:</u>

vf=vo+at=at

vo: initial velocity equal zero

t=vf/a=22.22/0.05=444.4s

4 0

3 years ago

๒гคเภɭץ ๓๏๔ร ςคภ รยςк ค ๔เςк ๒єςคยรє คɭɭ Շђєץ ๔๏ เร รՇєคɭ ק๏เภՇร Ŧг๏๓ ץ๏ย คภ๔ ץ๏ย ςคภՇ ๔๏ ภ๏Շђเภﻮ ค๒๏ยՇ เՇ

ElenaW [278]

Answer:

Ik it's sad it's ok tho

Explanation:

:'>

3 0

3 years ago

Human activities can have an impact on Earth's systems. Which Earth system is most affected when factories burn harmful chemical

IgorC [24]

Answer:

Hey

Your answer would be Earth's atmospheric system

Over time of cousre it will effect Earth's intire surface.

DON'T DRIVE MORE THAT YOU HAVE TO, SAVE THE EARTH!

7 0

3 years ago

A whistle of frequency 564 Hz moves in a circle of radius 71.2 cm at an angular speed of 17.1 rad/s. What are (a) the lowest and

trapecia [35]

Answer:

a) $f'=544.66 \textup{Hz}$

b) $f'=584.75 \textup{Hz}$

Explanation:

Given:

Frequency of the whistle, f = 564 Hz

Radius of the circle, r = 71.2 cm = 0.712 m

Angular speed, ω = 17.1 rad/s

speed of source, $v_s$ = rω = 0.712 × 17.1 = 12.1752 m/s

speed of sound, v = 343 m/s

Now, applying the Doppler's effect formula, we have

$f'=f\frac{v\pm v_d}{v\pm v_s}$

where,

$v_d$ = relative speed of the detector with respect to medium = 0

a) for lowest frequency, we have the formula as:

$f'=f\frac{v}{v+v_s}$

on substituting the values, we get

$f'=564\times\frac{343}{343+12.1752}$

or

$f'=544.66 \textup{Hz}$

b) for maximum frequency, we have the formula as:

$f'=f\frac{v}{v-v_s}$

on substituting the values, we get

$f'=564\times\frac{343}{343-12.1752}$

or

$f'=584.75 \textup{Hz}$

3 0

3 years ago