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KonstantinChe [14]
3 years ago
5

Need help will mark you the Brainliest

Physics
1 answer:
Hatshy [7]3 years ago
8 0
The last one is correct (D)
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You set a tuning fork into vibration at a frequency of 723 Hz and then drop it off the roof of the Physics building where the ac
zaharov [31]

Answer:

Explanation:

Given

Original Frequency f=723\ Hz

apparent Frequency f'=697\ Hz

There is change in frequency whenever source move relative to the observer.

From Doppler effect we can write as

f'=f\cdot \frac{v-v_o}{v+v_s}

where  

f'=apparent frequency  

v=velocity of sound in the given media

v_s=velocity of source

v_0=velocity of observer  

here v_0=0

697=723\cdot (\frac{343-0}{343+v_s})

v_s=(\frac{f}{f'}-1)v

v_s=(\frac{723}{697}-1)\cdot 343

v_s=12.79\approx 12.8\ m/s

i.e.fork acquired a velocity of 12.8 m/s

distance traveled by fork is given by

v^2-u^2=2as

where v=final velocity

u=initial velocity

a=acceleration

s=displacement

v_s^2-0=2\times 9.8\times s

s=\frac{12.8^2}{2\times 9.8}

s=8.35\ m

                                       

5 0
3 years ago
Work/Power problem with friction
Kisachek [45]

Answer:

This is the formula

Explanation:

−(0.54 m/s)2

2(−1.67 m/s2)

so this is the step by taking the mean of the maximum value of friction with the minimum value you can get the average force of friction

3 0
3 years ago
Read 2 more answers
Will this circuit work
Lyrx [107]

Answer:

yes

Explanation:

6 0
3 years ago
What is the speed of a cheetah that travels 176.4 meters in 4.5 seconds?
Ugo [173]

Answer:

\boxed{ \bold{ \boxed{ \sf{39.2 \: m/ {s} \:  }}}}

Explanation:

Given,

Distance travelled ( d ) = 176.4 meters

Time taken ( t ) = 4.5 seconds

<u>Finding </u><u>the </u><u>speed </u><u>of </u><u>a </u><u>cheetah</u>

Speed \sf{ =  \frac{distance \: travelled}{time \: taken} }

\sf{ =  \frac{176.4}{4.5} }

\sf{ = 39.2 \: m/ {s} \:  }

------------------------------------------------------------------------

<u>Let's </u><u>learn </u><u>about </u><u>Speed </u> :

Suppose a body moves 20 m in 2 seconds, either on a curved path or on a straight path. So , 10 m is the distance travelled by the body in each second which can be written as 10 m/s. This is called speed of the body. Thus, <u>Speed </u><u>is </u><u>defined </u><u>as </u><u>the </u><u>distance</u><u> </u><u>travelled</u><u> </u><u>per </u><u>unit </u><u>time.</u> It is the rate of distance travelled by a body.

Mathematically,

\boxed{ \bold{ \sf{speed =  \frac{distance \: travelled}{time \: taken} }}}

In SI system, the unit of distance is metre and time is second. Thus , the <u>SI </u><u>unit </u><u>is </u><u>speed </u><u>is </u><u>m/</u><u>s.</u>

Hope I helped!

Best regards!!

8 0
3 years ago
If a person walks at the rate of 5.25 mi/hr how pond does it would it take for someone to walk 35.5 miles
seraphim [82]

Answer: I’m assuming you meant how long instead of how pond? If so then it would take approximately 6.762 hours

Explanation:

5.25 x 6.762 = 35.5005

8 0
3 years ago
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