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OLga [1]
3 years ago
7

An Aeolian harp (named after Aeolus, the Greek god of the wind) consists of several strings fixed to a frame or a sounding box.

The device is simply placed outside, and the strings are played randomly by the wind. You decide to make such a harp out of strings that all have a mass per unit length of 2.40 grams per meter, and that all have a tension of 350 N. If you want one of the strings to have a fundamental frequency of 440 Hz, how long should you make it
Physics
1 answer:
Mashcka [7]3 years ago
5 0

Answer:

0.434 m

Explanation:

We are given that

Mass per unit length=\mu=\frac{m}{l}=2.4 g/m=2.4\times 10^{-3} kg/m

1 kg=1000 g

Tension=350 N

Fundamental frequency=f=440 Hz

We have to find the length you should make it.

We know that

l=\frac{1}{2f}\sqrt{\frac{T}{\mu}}

Using the formula

l=\frac{1}{2\times 440}\times\sqrt{\frac{350}{2.4\times 10^{-3}}}

l=0.434 m

Hence, you should make it 0.434 m long.

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We know, speed = Distance / Time
d = 384,750 Km
t = 2 days, 19.5 hours = 48+19.5 = 67.5 hour

Substitute their values, 
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In short, Your Answer would be 5700 Km/h

Hope this helps!
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3 years ago
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2 years ago
A 61 kg skater is traveling at 2.5 m/s while carrying a 4.0 kg bowling ball. After he throws the bowling ball forward at twice t
gregori [183]

The final velocity of the skater is 2.34 m/s forward

Explanation:

We can solve this problem by using the law of conservation of momentum. In fact, the total momentum of the system before and after the ball is thrown must be conserved, in absence of external forces.

Before the ball is thrown, the total momentum is:

p_i = (M+m)u

where

M = 61 kg is the mass of the skater

m = 4.0 kg is the mass of the ball

u = 2.5 m/s (forward) is the combined velocity of the skater and the ball

After, the ball is thrown at twice the velocity, so the final total momentum is

p_f = MV+mv

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Since the total momentum must be conserved, we can write

p_i = p_f\\(M+m)u = MV+mv\\V=\frac{(M+m)u-mv}{M}=\frac{(61+4.0)(2.5)-(4.0)(5.0)}{61}=2.34 m/s

So, the skater is moving at 2.34 m/s (forward) after the shot.

Learn more about momentum:

brainly.com/question/7973509

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Answer:

Reflective clothing. So vehicles can see them and stuff.

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Answer:

C) Check that the numerical answer is reasonable and the units are what you expected.

Explanation:

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