The students can feel the vibrations from the bleachers, but not from the drums because of the resonance.
<h3>What is the resonance?</h3>
The resonance condition occurs when the frequency of a wave matches with the resonance frequency.
The transfer of energy becomes maximum when the natural frequency matches with the frequency generated by the source.
The bleacher and student together having the frequency matching with the resonance frequency of the drum.
The bleacher and student with the bag frequency doesn't match with the resonance value of drums. Secondly, as distance increases sound intensity also decreases.
Thus, the student can feel the vibrations from the bleachers, but not from the drums because of the resonance.
Learn more about resonance.
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D. density is your answer because density is an intensive property. By the way is this for FLVS?
Efficiency =
(useful work you get out of it) / (work you put into it)
= (100,000 J) / (250,000 J)
= 0.4 = 40% (choice-A)
Answer:
(a) 
(b) 
Explanation:
Given:
*p = charge on proton = 
*e = magnitude of charge on an electron = 
*r = distance between the proton and the electron in the Rutherford's atom = 
Part (a):
Since two unlike charges attract each other.
According to Coulomb's law:

Hence, the attractive electrostatic force of attraction acting between an electron and a proton of Rutherford's atom is
.
Part (b):
Potential energy between two charges separated by a distance r is given by:

So, the potential energy between the electron and the proton of the Rutherford's atom is given by:

Hence, the electrostatic potential energy of the atom is
.