Four beats per second are heard when an unknown tuning fork and a 240 Hz tuning fork are struck simultaneously. This same unknow
1 answer:
When the tuning forks are struck simultaneously, the beat frequency is equal to the absolute value of the difference between the frequencies of the two tuning forks:
where
is the beat frequency, and 
are the frequencies of the two forks.
In the first part of the problem,
and 
, with 
being the frequency of the unknown fork. In the second part of the problem, 
and 
. So we have the following system of two equations:
and the solution of this system is
where
In the first part of the problem,
and the solution of this system is
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Answer:
14,700 N
Explanation:
The hyppo is standing completely submerged on the bottom of the lake. Since it is still, it means that the net force acting on it is zero: so, the weight of the hyppo (W), pushing downward, is balanced by the upward normal force, N:
(1)
the weight of the hyppo is
where m is the hyppo's mass and g is the gravitational acceleration; therefore, solving eq.(1) for N, we find