A man stands at the midpoint between two speakers that are broadcasting an amplified static hiss uniformly in all directions. Th
e speakers are 28.0 m apart and the total power of the sound coming from each speaker is 0.619 W. Find the total sound intensity the man hears when (a) he is at his initial position halfway between the speakers, and (b) after he has walked 2.0 m directly towards one of the speakers.
1 answer:
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Answer:
x=1.25m
Explanation:
The <em>Center of mass </em>of the system is defined as the point where whole mass of the body is appeared to be concentrated.
The center of mass of the system is given by
x=
where m1 is mass of man =60 kg
m2 mass of board =20 kg
let the man be at the origin x1 =0 , x2 =5m
by substituting in above formula
x = =
=1.25 m
x=1.25m
So the center of mass of the system is at 1.25 m from man.
Answer:
The linear momentum is given by the following equation:
(1)
Where is the mass and
the velocity.
On the other hand, the kinetic energy is given by:
(2)
Which is the same as:
Now, if we double the kinetic energy, equation (2) changes to:
(3)
So, if we want to obtain the kinetic energy as shown in (3), the only option that works is increasing momentum by a factor of or
:
Applying this in (2):
>>>As we can see, this equation is the same as equation (3)
Therefore, the correct answer is B