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valentinak56 [21]
3 years ago
8

You can identify a pure substance if you know it's ?

Physics
2 answers:
PIT_PIT [208]3 years ago
8 0
If you know the physical properties
Vika [28.1K]3 years ago
7 0
If you know it's physical properties
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A fire engine is moving south at 35 m/s while blowing its siren at a frequency of 400 Hz.
vodomira [7]

To solve this problem we will apply the concepts related to the Doppler effect. The Doppler effect is the change in the perceived frequency of any wave movement when the emitter, or focus of waves, and the receiver, or observer, move relative to each other. Mathematically it can be described as

f_d= f_s \frac{(v+v_d)}{(v-v_s)}

Here,

f_d=frequency received by detector

f_s=frequency of wave emitted by source

v_d=velocity of detector

v_s=velocity of source

v=velocity of sound wave

Replacing we have that,

f_d = 400(\frac{(343+18)}{(343-35)})

f_d=422 Hz

Therefore the frequencty that will hear the passengers is 422Hz

8 0
3 years ago
Where do people get their energy to turn a wheel??
Vesna [10]

Answer:

from food eaten (i.e contain carnlbohyadrates)

5 0
3 years ago
The first antiparticle, the positron or antielectron, was discovered in 1932. It had been predicted by Paul Dirac in 1928, thoug
Taya2010 [7]

Answer:

Energy of Photon = 4.091 MeV

Explanation:

From the conservation of energy principle, we know that total energy of the system must remain conserved. So, the energy or particles before collision must be equal to the energy of photons after collision.

K.E OF electron + Rest Energy of electron + K.E of positron + Rest Energy of positron = 2(Energy of Photon)

where,

K.E OF electron = 3.58 MeV

Rest Energy of electron = 0.511 MeV

Rest Energy of positron = 0.511 MeV

K.E OF positron = 3.58 MeV

Energy of Photon = ?

Therefore,

3.58 MeV + 0.511 MeV + 3.58 MeV + 0.511 MeV = 2(Energy of Photon)

Energy of Photon = 8.182 MeV/2

<u>Energy of Photon = 4.091 MeV</u>

8 0
3 years ago
When describing the interaction between magnetic poles we could say that
kifflom [539]
The Answer Is A 
Hope This Helps !

8 0
3 years ago
Read 2 more answers
A light-year is a measurement of _____.<br> a. time<br> b. gravity<br> c. energy<br> d. distance
Evgen [1.6K]
D. distance

A light-year is the distance light would travel in 1 year.
6 0
3 years ago
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