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3 years ago

3.Calculate the acceleration of a 1kg toy airplane that has been thrown with a force of 20N.

Physics

1 answer:

lisabon 2012 [21]3 years ago

5 0

Answer:

<h2> The acceleration of a 1kg toy is 20m/s^2</h2>

Explanation:

We are going to use the newtons law of motion (first law) to solve this problem

<h2>The expression is F=ma</h2>

where F is the force in Newton

m is the mass in kg and

a is the acceleration in m/s^2

given data

mass of the toy m= 1kg

force with which the toy is thrown = 20N

susbtituting we have

20=1*a

a= 20m/s^2

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taurus [48]

Answer:

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Explanation:

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3 years ago

A child has an ear canal that is 1.3 cm long. Assume the speed of sound is v = 344 m/s.

kap26 [50]

Answer:

The frequencies are $(f, f_1) = (6615.4 \ Hz , 19846.2\ Hz)$

Explanation:

From the question we are told that

The length of the ear canal is $l = 1.3 \ cm =\frac{1.3}{100} = 0.013 \ m$

The speed of sound is assumed to be $v_s = 344 \ m/s$

Now taking look at a typical ear canal we see that we assume it is a closed pipe

Now the fundamental harmonics for the pipe(ear canal) is mathematically represented as

$f = \frac{v_s}{4 * l }$

substituting values

$f = \frac{344}{4 * 0.013 }$

$f = 6615.4 \ Hz$

Also the the second harmonic for the pipe (ear canal) is mathematically represented as

$f_1 = \frac{3v_s}{4 * l}$

substituting values

$f_1 = \frac{3 * 344}{4 * 0.013}$

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Given that sound would be loudest in the pipe at the frequency, it implies that the child will have an increased audible sensitivity at this frequencies

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3 years ago

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Answer:

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3 years ago