Answer:
Yes, a body with a certain velocity can have an opposite acceleration, the acceleration would then be negative, since it is opposite to the direction to the velocity and also because the direction in which the acceleration is portrayed is on the left-hand side.
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Answer:
the positive and negative charges of the hydrogen and oxygen atoms that make up water molecules makes them attracted to each other
Explanation:
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Answer:
a. wavelength of the sound, ![\vartheta = 1.315\vartheta_{o}](https://tex.z-dn.net/?f=%5Cvartheta%20%3D%201.315%5Cvartheta_%7Bo%7D)
b. observed frequecy, ![\lambda = 0.7604\lambda_{o}](https://tex.z-dn.net/?f=%5Clambda%20%3D%200.7604%5Clambda_%7Bo%7D)
Given:
speed of sound source,
= 80 m/s
speed of sound in air or vacuum,
= 343 m/s
speed of sound observed,
= 0 m/s
Solution:
From the relation:
v =
(1)
where
v = velocity of sound
= observed frequency of sound
= wavelength
(a) The wavelength of the sound between source and the listener is given by:
(2)
(b) The observed frequency is given by:
![\vartheta = \frac{v_{a}}{v_{a} - v_{s}}\vartheta_{o}](https://tex.z-dn.net/?f=%5Cvartheta%20%3D%20%5Cfrac%7Bv_%7Ba%7D%7D%7Bv_%7Ba%7D%20-%20v_%7Bs%7D%7D%5Cvartheta_%7Bo%7D)
![\vartheta = \frac{334}{334 - 80}\vartheta_{o}](https://tex.z-dn.net/?f=%5Cvartheta%20%3D%20%5Cfrac%7B334%7D%7B334%20-%2080%7D%5Cvartheta_%7Bo%7D)
(3)
Using eqn (2) and (3):
![\lambda = \frac{334}{1.315} = \frac{1}{1.315}\frac{v_{a}}{\vartheta_{o}}](https://tex.z-dn.net/?f=%5Clambda%20%3D%20%5Cfrac%7B334%7D%7B1.315%7D%20%3D%20%5Cfrac%7B1%7D%7B1.315%7D%5Cfrac%7Bv_%7Ba%7D%7D%7B%5Cvartheta_%7Bo%7D%7D)
![\lambda = 0.7604\lambda_{o}](https://tex.z-dn.net/?f=%5Clambda%20%3D%200.7604%5Clambda_%7Bo%7D)
Answer:![\sqrt{2}f](https://tex.z-dn.net/?f=%5Csqrt%7B2%7Df)
Explanation:
Given
Fundamental Frequency(f) is 50 Hz
and frequency is given by
![f=\frac{1}{2L}\sqrt{\frac{T}{\mu }}---1](https://tex.z-dn.net/?f=f%3D%5Cfrac%7B1%7D%7B2L%7D%5Csqrt%7B%5Cfrac%7BT%7D%7B%5Cmu%20%7D%7D---1)
Where T= tension
=mass per unit length
if tension is doubled
![f'=\frac{1}{2L}\sqrt{\frac{2T}{\mu }}---2](https://tex.z-dn.net/?f=f%27%3D%5Cfrac%7B1%7D%7B2L%7D%5Csqrt%7B%5Cfrac%7B2T%7D%7B%5Cmu%20%7D%7D---2)
Divide 1& 2
![\frac{f}{f'}=\sqrt{\frac{T}{2T}}](https://tex.z-dn.net/?f=%5Cfrac%7Bf%7D%7Bf%27%7D%3D%5Csqrt%7B%5Cfrac%7BT%7D%7B2T%7D%7D)
![f'=\sqrt{2}f](https://tex.z-dn.net/?f=f%27%3D%5Csqrt%7B2%7Df)
Answer:
Explanation:
a helmet is used for our safety this piece of equipment is used to protect us from getting any injury's on our heads such as concussions getting a cut on your head etc.