Answer:
74dB
Explanation:
Sound intensity is inversely proportional to the square of the distance. Thus, a house four times closer hears a sound 16x more intense.
The dB scale is logarithmic, so 16x louder than 62 dB is equal to
62 + 10*log(16) ~= 62 + 12 = 74dB
Answer:
The appearance and composition of meteorites is what we would expect if metal and rock condensed and increased as our theory suggests.
Explanation:
The planets and most of their satellites were formed by accretion of matter that accumulated around the largest pieces of the proto-nebula. After a chaotic succession of collisions, mergers and reconstruction processes, they acquired a size similar to the current one and moved until they were in the positions we know.
The area closest to the Sun was too warm to retain light materials. That is why the inner planets are small and rocky, while the outer ones are large and gaseous. The evolution of the Solar System has not stopped, but, after the initial chaos, most of the materials are now part of bodies located in more or less stable orbits.
Any theory that attempts to explain the formation of the Solar System should take into account that the Sun rotates slowly and only has 1 percent of the angular momentum, but it has 99.9% of its mass, while the planets have 99% of the angular momentum and only 0.1% of the mass. One of the explanations argues that, at first, the Sun was much colder; The density of its materials was slowing its rotation, while warming, until a certain balance was achieved.
Answer:
0.4344A
Explanation:
From Ampere's law, it can be shown that the magnetic field B inside a long solenoid is

Where
B= Magnetic field strenght at distance d
I= current
Permeability of free space (
)
N= Number of loops
Our values are defined as follow,

T

As a current required to become 104 times the Earth's magnetic field is required, we use B '




<em>Therefore is needed 0.4344A in the solenoid to produce a magnetic field inside the solenoid, near its center, that is 104 times the Earth's magnetic field.</em>
Answer:
a. E=6.5*10^{5}N/C
b. E=-4.7*10^{4}N/C
Explanation:
We can use the result of applying the Gauss theorem to a infinite line of charge

with r the perpendicular distance to the line of charge. The total field will be the sum of the contribution to the field by each line of charge.
E=E1+E2
we have
+8.00 μC/m
-6.00 μC/m
y=1m
(a) y2=0.2m

(b) y3=0.616m

In this case the field is directed toward the line of charge placed in y=1m
True, the answer to the nature of sound waves is yes sound waves are longitudinal waves .