What happens to the amplitude of a sound wave when energy transfer is increased?
1 answer:
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Missing question: "<span> What is the speed v of the bus?"</span>
Solution:
Let's solve the problem by writing the equilibrium conditions on both x- and y- axis:
where
is the weight of the lunch box, 
is the centripetal force, T is the tension of the string and 
.
The radius r is the one with respect to the vertical position of the string, therefore
.
From the first equation we find
and if we replace this into the second one, we find
from which we can find the velocity:
Solution:
Let's solve the problem by writing the equilibrium conditions on both x- and y- axis:
where
The radius r is the one with respect to the vertical position of the string, therefore
From the first equation we find
and if we replace this into the second one, we find
from which we can find the velocity: