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lions [1.4K]
3 years ago
13

which statement best describes an asteroid? A. large chunks of rock with many craters that orbit the sun. B. Pieces of rock or d

ust that shine or flicker in the earth's atmosphere. C. An object made of ice, gas, and dust that orbits the earth. D. Large chunks of rock with bright tails that orbits the sun.
Physics
1 answer:
BigorU [14]3 years ago
8 0

Answer:

The answer is A.

Explanation:

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A bat emits a sound at a frequency of 30.0 kHz as it approaches a wall. The bat detects beats such that the frequency of the ech
Alex

Answer:

The speed of the bat is 5.02 m/s.

Explanation:

Given that,

Frequency = 30.0 kHz

Frequency of echo = 900 Hz

We need to calculate the frequency

Using formula of beat frequency

f_{b}=f_{1}-f_{2}

Put the value into the formula

900=f_{1}-30\times10^{3}

f_{1}=900+30000

f_{1}=30900\ Hz

We need to calculate the speed of the bat

Using Doppler equation

f_{apr}=f\times(\dfrac{v_{sound}+v_{observer}}{v_{s}-v_{source}})

Put the value into the formula

30900=30000\times(\dfrac{340+v_{bat}}{340-v_{bat}})

\dfrac{30900}{30000}=\dfrac{340+v_{bat}}{340-v_{bat}}

1.03=\dfrac{340+v_{bat}}{340-v_{bat}}

340\times1.03-340=v_{b}+1.03v_{b}

10.2=2.03v_{bat}

v_{bat}=\dfrac{10.2}{2.03}

v_{bat}=5.02\ m/s

Hence, The speed of the bat is 5.02 m/s.

6 0
3 years ago
How has the C0vid-19 health crisis impacted the Sports and Entertainment Industry?
netineya [11]

Answer:

This isn’t physics

Explanation:

4 0
3 years ago
Read 2 more answers
Waves are observed passing under a dock. Wave crests are 8.0 meters apart. The time for a complete wave to pass by is 4.0 second
Harlamova29_29 [7]
The distance between a trough and a crest is double the amplitude.

The distance between trough and crest is (9m - 6m) = 3m.

So the amplitude of those water waves is (3/2) = 1.5 meters.

For this question, we really don't need to know how far apart the crests are, or how often they pass.  There may be more parts to the question, for which that information is needed.

For example: 

-- What's the wavelength of the waves ?  8 meters.

-- What's the period of the waves ?  4 seconds.

-- What's the frequency of the waves ?  1 / (4 seconds) = 0.25 Hz.

-- What's the speed of the waves ? (8 m) x (0.25 Hz) = 2 m/s
3 0
3 years ago
You have been working on a new, strong, lightweight ceramic which will be used to replace steel bearing balls. One cubic meter o
marin [14]

Answer:

r=2.6 cm

Explanation:

Hi!

Lets call steel material 1, and the new alloy material 2. You know their densities:

\rho_1=8.08*10^3\frac{kq}{m^3}\\\rho_2=3.14*10^3\frac{kq}{m^3}

The volume of a sphere with radius r is given by:

V=\frac{4}{3}\pi r^3

Then the masses of the bearings are:

m_1=\rho_1V_1=\frac{4}{3}\pi r_1^3 \\m_1=\rho_2V_2=\frac{4}{3}\pi r_2^3

For the masses to be the same:

\rho_1 V_1 = \rho_2 V_2\\\frac{V_2}{V_1} =\frac{\rho_1}{\rho_2}\\(\frac{r_2}{r_1})^3 = \frac{8.08}{3.14}=2.57\\r_2=\sqrt[3]{2.57}\;r1 =1.37r_1=1.37*1.9cm=2.6cm

5 0
4 years ago
A hunter is practicing hitting a target that is down range. If the arrow leaves the bow at a velocity of 30ms at an angle of 40°
Flauer [41]

Answer:

Explanation:

range of projectile = u² sin2θ / g

u = 30 m /s

θ = 40°

range = 30² x sin 80 / 9.8

= 90.44 m

b )

maximum altitude H = u² sin²θ / 2 x g

= 30² sin²40 / 9.8

= 37.94 m .

6 0
3 years ago
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