Answer:
Explanation:
A) 131 dB = 10*log(I / 1e-12W/m²)
where I is the intensity at 2.6 m away.
13.1 = log(I / 1e-12W/m²
1.25e13= I / 1e-12W/m²
I = 1.25 x10^1W/m²
power = intensity * area
P = I * A = 12.5W/m² * 4π(2.6m)² =1061 W ◄
B) 86 dB = 10*log(I / 1e-12W/m²)
8.6 = log(I / 1e-12W/m²)
3.98e8 = I / 1e-12W/m²
I = 3.98e-4 W/m²
area A = P / I = 1061W / 3.98e-4W/m² = 2.66e6 m²
A = 4πr²
2.66e6 m² = 4πr²
r = 14.5m ◄
By definition we have that the linear moment is
p = m * v
Where
m = mass
v = speed.
Clearing the mass we have
m = p / v
Substituting the values
m= (13,300 kgm/s)/(14 m/s)=950Kg
the mass of the car is 950 Kg
Answer:
The two forces acting on a boat or some other floating object are buoyancy and gravity
10+8 = 18
5+2 = 7
18-7 = 11
a) to the right by 11N.
Answer:
0.00384 kg/m
Explanation:
The fundamental frequency of string waves is given by
For some tension (F) and length (L)
Fundamental frequency of G string
Fundamental frequency of E string
Linear mass density of E string is
So,
The linear density of the G string is 0.00384 kg/m
