Ask question

Ask question

All categories

uranmaximum [27]

3 years ago

13

A bat can detect small objects such as an insect whose size is approximately equal to the wavelength of the sound the bat makes.

What is the smallest insect a bat can detect? Assume that bats emit a chirp at a frequency of 33.3 kHz, and that the speed of sound in air is 536 m/s. Answer in units of mm.

1 answer:

slamgirl [31]3 years ago

7 0

Answer:

size of insect = wavelength = 16.1 mm

Explanation:

Since the bat can detect the size of small insects which are of size equal to the wavelength of sound in air

So here we can say that the wavelength of sound is the ratio of speed of sound and its frequency

here we know that

speed of sound in air is 536 m/s

frequency of sound is 33.3 kHz

so here we can say

$\lambda = \frac{v}{f}$

$\lambda = \frac{536}{33.3 \times 10^3}$

$\lambda = 0.0161 m$

$\lambda = 16.1 mm$

You might be interested in

What happens if a bar magnet is broken in half?

laiz [17]

<span>C. Each half becomes a new bar magnet with two magnetic poles.

A magnet is still a magnet, no matter how many pieces it is in.</span>

4 0

3 years ago

Read 2 more answers

If a hockey player starts from rest and accelerates at a rate of 2.1 m/s², how long does it take him to skate 30 m?

Vlada [557]

Answer:

its A i think im not sure tho

Explanation:

5 0

3 years ago

Inthisexperiment,aspringforcewasusedtokeep moving object travelingin a circularpath.The size of a spring force should be proport

poizon [28]

Answer:

By calculation, it can be shown that;

K = $\frac{F_{angular}}{2\times x\times c}$

Whereby for constant K, as ${F_{angular}}$ increases, x also increases.

Explanation:

The experiment set up consisted of the use of a spring force to maintain the object in circular path.

The energy in the spring is given by

$\frac{1}{2}\cdot k\cdot x^2$ .

Rotational kinetic energy = $\frac{1}{2}$ ·I·ω²

Inertia, I = $\frac{1}{2}$ ·m·r²

ω = $\frac{v}{r}$

Substituting gives

Rotational kinetic energy = $\frac{1}{2}$ ·

= $\frac{1}{4}$ ·m· v²

Equating both equations gives

K = $\frac{2\times m\times v^2}{4\times x^{2} }$ = $\frac{1\times m\times v^2}{2\times x^{2} }$

Within the proportionality limit, x ∝ r

therefore we can write x = c·r which gives

$\frac{ m\times v^2}{2\times x\times c\times r }$ = $\frac{v^{2} }{r} \times\frac{m}{2\times x\times c}$

Since $\frac{v^{2} }{r}$ = angular acceleration, α, then

m× $\frac{v^{2} }{r}$ = Angular force

Therefore K = $\frac{F_{angular}}{2\times x\times c}$

Therefore as Force, F increases, x also increases and the size of a spring force should be proportional to the amount of stretch in the spring.

3 0

3 years ago

Identify two factors that determine the intensity of sound

anastassius [24]

Amplitude and distance.

5 0

3 years ago

Tom Cruise jumped from one building to other building while filming the roof chase scene in Mission: Impossible - Fallout. He di

OLga [1]

Answer:

$v_0=9.9\ m.s^{-1}$

Explanation:

Given:

angle of launch of projectile from horizontal, $\theta=15^{\circ}$

range of projectile, $R=5\ m$

<u>We have formula for the range of projectile:</u>

$R=\frac{v_0^2\times sin\ 2\theta}{g}$

putting the respective values

$5=\frac{v_0^2\times sin\ 30^{\circ}}{9.8}$

$v_0=9.9\ m.s^{-1}$ is the velocity with which Tom should jump to land on the other roof.

3 0

3 years ago