P4.6 shows a mixing tank initially containing 2000 lb of liquid water. The tank is fitted with two inlet pipes, one delivering h
ot water at a mass flow rate of 0.8 lb/s and the other delivering cold water at a mass flow rate of 1.2 lb/s. Water exits through a single exit pipe at a mass flow rate of 2.5 lb/s. Determine the amount of water, in lb, in the tank after one hour.
2 answers:
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Answer:
Explanation:
First, we will use conservation of the linear momentum:
so:
where is the mass of the dart,
is the speed of the dart just before it strickes the apple,
the mass of the apple and
the velocity of the apple and the dart after the collition.
Then, solving for V_s:
now, using the conservation of energy:
so:
where g is the gravity and h how high does the apple move upward.
Now, replacing and solving for h, we get:
Answer:
102 dB
Explanation:
Intensity level is given by: