Answer:
Hope it helps you :)
Explanation in the pic above.
Answer:
Comets
Explanation:
The Kuiper Belt is a collection of trans-Neptunian objects that consist of comets and other dwarf planets, including Pluto.
Answer:
50
Explanation:
The mechanical advantage of a machine is given by

where
is the output force
is the input force
For the crowbar in this problem,
is the force in input applied by the worker
is the force that the machine must apply in output to overcome the resistance of the window and to open it
Substituting into the equation, we find

An electron has a negative charge. Hope this helps.
Answer:
72.04 dB.
Explanation:
The intensity level of 60dB corresponds to the sound intensity
given by the equation

where 
solving for
we get:



Now, when 16 violins are playing the intensity
becomes

which on the decibel scale gives

.
Thus, playing 16 violins together gives the intensity level of 72 dB.