Answer:
Explanation:
From the question we are told that:
Frequency 
Sound intensity drop 
Time 
Therefore
Sound intensity Ratio
Generally the equation for Sound intensity is mathematically given by
Generally the equation for Quality Factor is mathematically given by
Answer:
From lowest to highest acceleration:
3rd train
2nd train
1st train
Explanation:
The acceleration of an object can be found by using Newton's second law:
where
a is the acceleration
F is the net force on the object
m is the mass of the object
We notice that for equal values of the forces F, the acceleration a is inversely proportional to the mass, m. Therefore, greater mass means lower acceleration, and viceversa.
So, the train with lowest acceleration is the one with largest mass, i.e. the 3rd train consisting of 50 equally loaded freight cars. Then, the 2nd train has larger acceleration, since it consists of 50 empty freight cars (so its mass is smaller). Finally, the 1st train (a single empty car) is the one with largest acceleration, since it is the train with smallest mass.
The tension in the string and the acceleration must be equal for both masses. (See the free body diagrams)
Answer:
28.57 Mpc
Explanation:
This question is going to be solved by applying Hubble's Law.
This Hubble's Law is actually an observation in physical cosmology. This observation makes it clear that galaxies are moving away from the Earth, and are doing so at speeds proportional to their distance. This essentially means that the farther they are from the Earth, the faster they are moving away from Earth.
It is represented by this formula
v = H(0)D, where
v = speed
H(0) = Constant of proportionality, or otherwise, Hubble's constant.
D = Distance to a galaxy
Applying the given parameters to the formula, we have
v = H(0).D
D = v / H(0)
D = 2000 / 70
D = 28.57 Mpc
Answer:
They create electricity from the sun's rays
Explanation:
By the use of "solar cells" or "solar panel", you can trap solar energy in silicon/germanium rods, then you can convert in into electricity too. Solar powered panels convert the sun's rays into electricity by exciting electrons in silicon cells using the photons of light from the sun. This electricity can then be used to supply renewable energy to your home or business.
