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Elis [28]
3 years ago
5

Determine the length of a wind instrument, assuming that it is modeled as a closed tube and that the lowest sound that it can pl

ay has a frequency of 69 Hz. The speed of sound in air is 343 m/s.
Physics
1 answer:
denis-greek [22]3 years ago
3 0

Answer:

length = 1.24m

Explanation:

velocity = frequency x wavelength

wavelength = velocity/frequency

w = 343/69 =4.97m

length = wavelength/4

length =4.97/4 =1.24m

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An Olympic diver springs off of a high dive that is 3 m above the surface of the water. When she lands in the water she is trave
klemol [59]

Answer:u=4.51 m/s\ at\ angle\ of\ \theta =59.34^{\circ}

Explanation:

Given

height of building h=3 m

Landing velocity of diver v=8.90 m/s at an angle of 75^{\circ}

Let u be the initial velocity of diver at an angle of \theta with horizontal

Since there is no acceleration in horizontal direction therefore horizontal component of velocity will remain same

u\cos \theta =8.9\cos (75)        ---- -----1

Considering Vertical motion

v^2-u^2=2as

here v=8.9\sin (75)

u=u\sin \theta

s=3 m

a=9.8 m/s^2

(8.9\sin (75))^2-(u\sin \theta )^2=2\times 9.8\times 3

u\sin \theta =\sqrt{(8.9\sin 75)^2-(2\cdot 9.8\cdot 3)}

u\sin \theta =3.886         ----------------2

Divide 2 and 1 we get

\tan \theta =\frac{3.886}{8.9\cos (75)}

\tan \theta =1.687

\theta =59.34^{\circ}

Thus u\cos (59.34)=8.9\cos (75)

u=4.51 m/s

7 0
3 years ago
A space probe is coasting through space at a steady speed of 100p feet per second. the booster rocket fires for 1/2 seconds so t
aleksandr82 [10.1K]

Answer:

Acceleration: 9800 ft/s^2

Explanation:

The acceleration of an object is equal to the rate of change of velocity:

a=\frac{v-u}{t}

where

u is the initial velocity

v is the final velocity

t is the time taken for the velocity to change from u to v

For the space probe in this problem, we have:

u = 100 ft/s (initial velocity)

v = 5000 ft/s (final velocity)

t = 0.5 s (time taken)

Therefore, the acceleration is

a=\frac{5000-100}{0.5}=9800 ft/s^2

6 0
3 years ago
If the labor force of 155 million people is growing by 1.0 percent per year, how many new jobs have to be created each month to
dybincka [34]

First let us compute for the total growth in population.

Growth = 155 million * 0.01

Growth = 1.55 million

 

Since there are 12 months in a year, therefore the new jobs every month should be:

new jobs per month = 1.55 million / 12

<span>new jobs per month = 0.129 million = 129,167 </span>

8 0
4 years ago
An important safety consideration with an electromagnet is to disconnect the wires when not in use because they can get ________
Rashid [163]

Answer:

Hot (A)

Explanation:

because there are electrons going through there, the friction between the metallic nuclei and electrons creates vibrations known as heat.

if you touch it the electrons will run through your body and caus damadge.

5 0
3 years ago
Why do people walks bare feel pain
matrenka [14]

Answer:

As we age the fat pad underneath the bones at the front of our feet (metatarsal heads) and under the heel bone become thinner or “migrate” away from where they are most needed

8 0
3 years ago
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