Answer:
6.02dB
Explanation:
The sound level intensity can be calculated by using the formula:
where Io is the threshold of human hearing, and I is the intensity of the sound in at a certain distance. I is given by
where P is the power of the source and r is the distance to the source. By replacing I in the expression for I(dB) we obtain
when jim halves the distance we have r'=1/2r:
Hence, the change o decibels is:
hope this helps!!
Some of the main minerals in igneous rocks are feldspar, quartz, olivine and mica. The size of the minerals depends on the depth of the magma that formed the rock. Deeper magma cools more slowly and forms larger crystals. Rocks that cool over a few months have microscopic mineral grains and are called extrusive. Rocks that cool over thousands of years have small to medium grains and are called intrusive. Rocks that cool over millions of years have large pebble sized grains and are called plutonic.
Granite and basalt make up the majority of igneous rocks. Basalt is dark and fine-grained with minerals rich in magnesium and iron. It is either extrusive or intrusive and is the primary rock on the ocean floor. Granite is light and coarse-grained and rich in feldspar and quartz. It is plutonic and less dense than basalt. Granite is found nearly everywhere beneath the continents.
The word "igneous" comes from the Latin word "fire" and is related to the melting process that forms these rocks.
Hope I helped! :)
Δx=Vi(t)+.5at²
Δx=80
a=9.8
Vi=0 since its from rest, the initial velocity is 0.
80=0+.5(9.8)t²
t=16.33
You can use one of the big five equations: Vf=Vi+at
Vf=0+9.8(16.33)
Vf=160.034 m/s
Answer:
option A
Explanation:
A soccer field is about 100 meters of length, with the other instruments is possible to make the measure, but it will be very complex and it will take time. Therefore with the 50-m tape, the student will need only two measures.
<span>They both used charged particles in their experiments.</span>
