Query 16

course PHY 202

???w??????????T?h?assignment #016

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016. `query 6

Physics II

07-09-2007

????\{??y??}??f???assignment #016

016. `query 6

Physics II

07-09-2007

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23:01:18

query introset change in pressure from diameter change given original vel and diameter

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RESPONSE -->

I will use Bernoulli's equation to solve this problem, but I can modify it.

There is no change in altitude given so,

P + .05(rho)(v^2)=0, were P=Pressure, .rho=density of fluid, v=velocity.

If we are solving for P, then P=-(.05)(rho)(v^2).

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23:02:05

** The ratio of velocities is the inverse ratio of cross-sectional areas.

Cross-sectional area is proportional to square of diameter. So velocity is inversely proportional to cross-sectional area:

v2 / v1 = (A1 / A2) = (d1 / d2)^2 so

v2 = (d1/d2)^2 * v1.

Since h presumably remains constant we have

P1 + .5 rho v1^2 = P2 + .5 rho v2^2 so

(P2 - P1) = 0.5 *rho (v1^2 - v2^2) . **

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23:15:54

query video experiment 4 terminal velocity of sphere in fluid. What is the evidence from this experiment that the drag force increases with velocity?

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RESPONSE -->

I don't think I can answer this question. The experiment that this question refers to is actually experiment 7 on our cd's(Terminal Velocity of a Fluid) and it cannot be accessed.

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23:16:01

** When weights were repetitively added the velocity of the sphere repetively increased. As the velocities started to aproach 0.1254 m/sec the added weights had less and less effect on increasing the velocity. We conclude that as the velocity increased so did the drag force of the water. **

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RESPONSE -->

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assignment #016

016. `query 6

Physics II

07-09-2007"

Query 16

end of document

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