17.8 Shock waves  (Page 4/8)

 Page 4 / 8

A bullet is fired and moves at a speed of 1342 mph. Assume the speed of sound is $v=340.00\phantom{\rule{0.2em}{0ex}}\text{m/s}\text{.}$ What is the angle of the shock wave produced?

A speaker is placed at the opening of a long horizontal tube. The speaker oscillates at a frequency of f , creating a sound wave that moves down the tube. The wave moves through the tube at a speed of $v=340.00\phantom{\rule{0.2em}{0ex}}\text{m/s}\text{.}$ The sound wave is modeled with the wave function $s\left(x,t\right)={s}_{\text{max}}\text{cos}\left(kx-\omega t+\varphi \right)$ . At time $t=0.00\phantom{\rule{0.2em}{0ex}}\text{s}$ , an air molecule at $x=2.3\phantom{\rule{0.2em}{0ex}}\text{m}$ is at the maximum displacement of 6.34 nm. At the same time, another molecule at $x=2.7\phantom{\rule{0.2em}{0ex}}\text{m}$ has a displacement of 2.30 nm. What is the wave function of the sound wave, that is, find the wave number, angular frequency, and the initial phase shift?

$\begin{array}{}\\ \\ {s}_{1}=6.34\phantom{\rule{0.2em}{0ex}}\text{nm}\hfill \\ {s}_{2}=2.30\phantom{\rule{0.2em}{0ex}}\text{nm}\hfill \\ k{x}_{1}+\varphi =0\phantom{\rule{0.2em}{0ex}}\text{rad}\hfill \\ k{x}_{2}+\varphi =1.20\phantom{\rule{0.2em}{0ex}}\text{rad}\hfill \\ k\left({x}_{2}-{x}_{1}\right)=1.20\phantom{\rule{0.2em}{0ex}}\text{rad}\hfill \\ k=3.00\phantom{\rule{0.2em}{0ex}}{\text{m}}^{-1}\hfill \\ \omega =1019.62\phantom{\rule{0.2em}{0ex}}{\text{s}}^{-1}\hfill \\ {s}_{1}={s}_{\text{max}}\text{cos}\left(k{x}_{1}-\varphi \right)\hfill \\ \varphi =5.66\phantom{\rule{0.2em}{0ex}}\text{rad}\hfill \\ s\left(x,t\right)=6.30\phantom{\rule{0.2em}{0ex}}\text{nm}\text{cos}\left(3.00\phantom{\rule{0.2em}{0ex}}{\text{m}}^{-1}x-1019.62\phantom{\rule{0.2em}{0ex}}{\text{s}}^{-1}t+5.66\right)\hfill \end{array}$

An airplane moves at Mach 1.2 and produces a shock wave. (a) What is the speed of the plane in meters per second? (b) What is the angle that the shock wave moves?

A 0.80-m-long tube is opened at both ends. The air temperature is $26\text{°}\text{C}\text{.}$ The air in the tube is oscillated using a speaker attached to a signal generator. What are the wavelengths and frequencies of first two modes of sound waves that resonate in the tube?

${v}_{\text{s}}=346.40\phantom{\rule{0.2em}{0ex}}\text{m/s}$ ;
$\begin{array}{}\\ \\ {\lambda }_{n}=\frac{2}{n}L\phantom{\rule{0.5em}{0ex}}\phantom{\rule{0.5em}{0ex}}\phantom{\rule{0.5em}{0ex}}{f}_{n}=\frac{{v}_{\text{s}}}{{\lambda }_{n}}\hfill \\ {\lambda }_{1}=1.60\phantom{\rule{0.2em}{0ex}}\text{m}\phantom{\rule{0.5em}{0ex}}\phantom{\rule{0.5em}{0ex}}{f}_{1}=216.50\phantom{\rule{0.2em}{0ex}}\text{Hz}\hfill \\ {\lambda }_{2}=0.80\phantom{\rule{0.2em}{0ex}}\text{m}\phantom{\rule{0.5em}{0ex}}\phantom{\rule{0.5em}{0ex}}{f}_{1}=433.00\phantom{\rule{0.2em}{0ex}}\text{Hz}\hfill \end{array}$

A tube filled with water has a valve at the bottom to allow the water to flow out of the tube. As the water is emptied from the tube, the length L of the air column changes. A 1024-Hz tuning fork is placed at the opening of the tube. Water is removed from the tube until the $n=5$ mode of a sound wave resonates. What is the length of the air column if the temperature of the air in the room is $18\text{°}\text{C?}$ Consider the following figure. The length of the string between the string vibrator and the pulley is $L=1.00\phantom{\rule{0.2em}{0ex}}\text{m}\text{.}$ The linear density of the string is $\mu =0.006\phantom{\rule{0.2em}{0ex}}\text{kg/m}\text{.}$ The string vibrator can oscillate at any frequency. The hanging mass is 2.00 kg. (a)What are the wavelength and frequency of $n=6$ mode? (b) The string oscillates the air around the string. What is the wavelength of the sound if the speed of the sound is ${v}_{s}=343.00\phantom{\rule{0.2em}{0ex}}\text{m/s}$ ? a. $\begin{array}{}\\ \\ {\lambda }_{6}=0.40\phantom{\rule{0.2em}{0ex}}\text{m}\hfill \\ \\ \\ v=57.15\frac{\text{m}}{\text{s}}\hfill \\ {f}_{6}=142.89\phantom{\rule{0.2em}{0ex}}\text{Hz}\hfill \end{array}$ ; b. ${\lambda }_{\text{s}}=2.40\phantom{\rule{0.2em}{0ex}}\text{m}$

Early Doppler shift experiments were conducted using a band playing music on a train. A trumpet player on a moving railroad flatcar plays a 320-Hz note. The sound waves heard by a stationary observer on a train platform hears a frequency of 350 Hz. What is the flatcar’s speed in mph? The temperature of the air is ${T}_{\text{C}}=22\text{°}\text{C}$ .

Two cars move toward one another, both sounding their horns $\left({f}_{s}=800\phantom{\rule{0.2em}{0ex}}\text{Hz}\right)$ . Car A is moving at 65 mph and Car B is at 75 mph. What is the beat frequency heard by each driver? The air temperature is ${T}_{C}=22.00\text{°}\text{C}$ .

$\begin{array}{}\\ \\ v=344.08\frac{\text{m}}{\text{s}}\hfill \\ {v}_{A}=29.05\frac{\text{m}}{\text{s}},\phantom{\rule{0.5em}{0ex}}{v}_{B}=33.52\phantom{\rule{0.2em}{0ex}}\text{m/s}\hfill \\ {f}_{A}=961.18\phantom{\rule{0.2em}{0ex}}\text{Hz,}\phantom{\rule{0.5em}{0ex}}\hfill \\ {f}_{B}=958.89\phantom{\rule{0.2em}{0ex}}\text{Hz}\hfill \\ {f}_{A,\text{beat}}=161.18\phantom{\rule{0.2em}{0ex}}\text{Hz,}\phantom{\rule{0.5em}{0ex}}{f}_{B,\text{beat}}=158.89\phantom{\rule{0.2em}{0ex}}\text{Hz}\hfill \end{array}$

Student A runs after Student B. Student A carries a tuning fork ringing at 1024 Hz, and student B carries a tuning fork ringing at 1000 Hz. Student A is running at a speed of ${v}_{A}=5.00\phantom{\rule{0.2em}{0ex}}\text{m/s}$ and Student B is running at ${v}_{B}=6.00\phantom{\rule{0.2em}{0ex}}\text{m/s}\text{.}$ What is the beat frequency heard by each student? The speed of sound is $v=343.00\phantom{\rule{0.2em}{0ex}}\text{m/s}\text{.}$

a particle projected from origin moving on x-y plane passes through P & Q having consituents (9,7) , (18,4) respectively.find eq. of trajectry.
definition of inertia
the reluctance of a body to start moving when it is at rest and to stop moving when it is in motion
charles
An inherent property by virtue of which the body remains in its pure state or initial state
Kushal
why current is not a vector quantity , whereas it have magnitude as well as direction.
why
daniel
the flow of current is not current
fitzgerald
bcoz it doesn't satisfy the algabric laws of vectors
Shiekh
The Electric current can be defined as the dot product of the current density and the differential cross-sectional area vector : ... So the electric current is a scalar quantity . Scalars are related to tensors by the fact that a scalar is a tensor of order or rank zero .
Kushal
what is binomial theorem
what is binary operations
Tollum
What is the formula to calculat parallel forces that acts in opposite direction?
position, velocity and acceleration of vector
hi
peter
hi
daniel
hi
Vedisha
*a plane flies with a velocity of 1000km/hr in a direction North60degree east.find it effective velocity in the easterly and northerly direction.*
imam
hello
Lydia
hello Lydia.
Sackson
What is momentum
isijola
hello
A rail way truck of mass 2400kg is hung onto a stationary trunk on a level track and collides with it at 4.7m|s. After collision the two trunk move together with a common speed of 1.2m|s. Calculate the mass of the stationary trunk
I need the solving for this question
philip
is the eye the same like the camera
I can't understand
Suraia
Josh
I think the question is that ,,, the working principal of eye and camera same or not?
Sardar
yes i think is same as the camera
what are the dimensions of surface tension
samsfavor
why is the "_" sign used for a wave to the right instead of to the left?
why classical mechanics is necessary for graduate students?
classical mechanics?
Victor
principle of superposition?
principle of superposition allows us to find the electric field on a charge by finding the x and y components
Kidus
Two Masses,m and 2m,approach each along a path at right angles to each other .After collision,they stick together and move off at 2m/s at angle 37° to the original direction of the mass m. What where the initial speeds of the two particles
MB
2m & m initial velocity 1.8m/s & 4.8m/s respectively,apply conservation of linear momentum in two perpendicular directions.
Shubhrant
A body on circular orbit makes an angular displacement given by teta(t)=2(t)+5(t)+5.if time t is in seconds calculate the angular velocity at t=2s
MB
2+5+0=7sec differentiate above equation w.r.t time, as angular velocity is rate of change of angular displacement.
Shubhrant
Ok i got a question I'm not asking how gravity works. I would like to know why gravity works. like why is gravity the way it is. What is the true nature of gravity?
gravity pulls towards a mass...like every object is pulled towards earth
Ashok
An automobile traveling with an initial velocity of 25m/s is accelerated to 35m/s in 6s,the wheel of the automobile is 80cm in diameter. find * The angular acceleration
(10/6) ÷0.4=4.167 per sec
Shubhrant
what is the formula for pressure?
force/area
Kidus
force is newtom
Kidus
and area is meter squared
Kidus
so in SI units pressure is N/m^2
Kidus
In customary United States units pressure is lb/in^2. pound per square inch
Kidus   By Prateek Ashtikar   By    