Lets use an ambulance as an example:
Lets say we are stationary on a sidewalk and a ambulance is coming towards us, at first we hear the sound at a lower pitch as it is further away, but as the ambulance travels towards us the frequency, which denotes how many waves pass a given point per unit time (we are the point), will get higher, meaning an increase in pitch as the waves become "denser" or more compressed. As the ambulance travels away you will hear the sound at a lower pitch because the frequency of sound waves passing you per unit time is less and it will continue to lessen until the ambulance can no longer be heard.
Essentially--> higher frequency means higher pitch
The waves become more compressed as a it moves with velocity v towards a certain point.
Answer:
D. The total energy of a system can increase only if energy enters the
system
energy must be conserved--it cannot be created or destroyed.
so, if the energy of a system increases, that energy must have come from somewhere
hope this helps!!
AMA is actual mechanical advantage in where it would compare the force in as well as out in using actual measurements in the real life or with friction while in IMA which is the ideal mechanical advantage no friction then is needed. The answer then is a. the value of IMA is larger than AMA.
Missing detail in the text:
"<span>A small glass bead has been charged to + 25 nC "
Solution
The force exerted on a charge q by an electric field E is given by
</span>
<span>Considering the charge on the bead as a single point charge, the electric field generated by it is
</span>
with
,
is the charge on the bead. We want to calculate the field at
:
The proton has a charge of
, therefore the force exerted on it is
And finally, we can use Newton's second law to calculate the acceleration of the proton. Given the proton mass,
, we have
The charge on the bead is positive, and the proton charge is positive as well, therefore the proton is pushed away from the bead, so: