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Acoustics
The velocity of a typical hydrogen ion (proton) at room temperature is about 3000 m/s (A)
IF the magnetic field of the earth is 10^-4 T, what is the maximum magnetic force on the hydrogen ion? (ive answered this one, also there is a solution posted to this on here) ans 4.86*10^-20.
B) At what distance would 2 hydrogen ions experience a force from each other of the same magnitude as (a)?
What do your answers to parts a and b suggest concerning the influence of the earths magnetic field on most biochemical substances.
Thanks to anyone who can help!, this is my first time asking questions on here.
IF the magnetic field of the earth is 10^-4 T, what is the maximum magnetic force on the hydrogen ion? (ive answered this one, also there is a solution posted to this on here) ans 4.86*10^-20.
B) At what distance would 2 hydrogen ions experience a force from each other of the same magnitude as (a)?
What do your answers to parts a and b suggest concerning the influence of the earths magnetic field on most biochemical substances.
Thanks to anyone who can help!, this is my first time asking questions on here.
Acoustics
5. A bullet is fired through a board 10.0 cm thick in such a way that the bullet’s line of motion is perpendicular to face of the board. If the initial speed of the bullet is 400 m/s and it emerges from the other side of the board with a speed of 300 m/s, find (a) the acceleration of the bullet as it passes through the board and (b) the total time the bullet is in contact with the board.
Acoustics
explain of reflection
Acoustics
In the wave equation, it states that wavelength = velocity of the wave ÷ frequency. Or is it the constant velocity of light 299,792,458 divided by the frequency. And if it is the velocity of the wave ÷ frequency, how do I find the velocity of the wave without knowing wavelength? All I know is frequency and the length of the string that is being plucked.
Acoustics
( 1.) A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is not true?<
(A) The passenger is in motion relative to the passer-by
(B) The passer-by is stationery relative to the passenger
(C) Both observers are in motion relative to each other
(D) The passer-by is in motion relative to the passenger
( 2.) Which of the following statements is not correct about reference frames?
(A) Laws of physics are invariant in inertial reference frames
(B) In non-inertial reference frames the motion of objects depend only on the interactions of constituent particles among themselves
(C) Any reference frame moving at constant velocity with respect to an inerial refernce frame is also inertial
(D) If the coordinate axes of a reference frame attached to an object remain fixed in space then the object is at rest
( 3.) What are the dimensions of power (time rate of change of expending energy)
ML/T^2
ML^2/T^3
ML^2/T^2
M^2L^2/T^3
(A) The passenger is in motion relative to the passer-by
(B) The passer-by is stationery relative to the passenger
(C) Both observers are in motion relative to each other
(D) The passer-by is in motion relative to the passenger
( 2.) Which of the following statements is not correct about reference frames?
(A) Laws of physics are invariant in inertial reference frames
(B) In non-inertial reference frames the motion of objects depend only on the interactions of constituent particles among themselves
(C) Any reference frame moving at constant velocity with respect to an inerial refernce frame is also inertial
(D) If the coordinate axes of a reference frame attached to an object remain fixed in space then the object is at rest
( 3.) What are the dimensions of power (time rate of change of expending energy)
ML/T^2
ML^2/T^3
ML^2/T^2
M^2L^2/T^3
Acoustics
outermost layer of earth's atmosphere is called as????
Acoustics
what is the mass of chair inside a classroom where g=9.8 m/s2 if it weights 300 N? what it is weight if it were on the surface of the moon
Acoustics
What do you understand by wave impedance? Derive an expression for the
impedance offered to sound waves propagating in a gaseous medium
impedance offered to sound waves propagating in a gaseous medium
Acoustics
A team of geophysicists is standing on the ground. Beneath their feet, at an unknown distance, is the ceiling of a cavern. Its floor is a distance h below this ceiling. To measure h, the team places microphones on the ground. At t = 0 s, a sound pulse is sent straight downward through the ground and into the cavern. When this pulse reaches the ceiling of the cavern, one part of it is reflected back toward the microphones, and a second part continues downward, eventually to be reflected from the cavern floor. The sound reflected from the cavern ceiling reaches the microphones at t = 0.0245 s, and the sound reflected from the cavern floor arrives at t = 0.0437 s. The cavern is presumed to be filled with air at a temperature at 9 degrees Celsius. Assuming that sir behaves like an ideal gas, what is the height h of the cavern?
Acoustics
A bat flies at a steady speed of 4 m/s emitting a sound of f = 90000 Hz. It is flying horizontally towards a vertical wall. What is the frequency of the reflected sound as detected by the bat?
(Take velocity of sound in air as 330 m/s).
(Take velocity of sound in air as 330 m/s).
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