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3 years ago

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Brainliest answer! You and a friend are at a park and want to swing on the swings. Describe when you would have the greatest pot

ential energy and when you would have the greatest kinetic energy.

2 answers:

son4ous [18]3 years ago

8 0

Answer:

for an example

Explanation:

the swing is briefly motionless. It has the greatest potential energy, because it is highest above the surface. while me and a friend thats when kinetic energy comes

and kinetic energy is when me and my friend would swing down at the same speed with a movement of greatness

NemiM [27]3 years ago

3 0

Answer the point I wish you would have the greatest potential energy is when you are coming down the swing and getting ready to go up the greatest kinetic energy is whenever you’re falling back down from the height of how far you went up

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At one point in a pipeline, the water's speed is 3.57 m/s and the gauge pressure is 68.7 kPa. Find the gauge pressure at a secon

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Answer:

The pressure at point 2 is $P_2 = 254.01 kPa$

Explanation:

From the question we are told that

The speed at point 1 is $v_1 = 3.57 \ m/s$

The gauge pressure at point 1 is $P_1 = 68.7kPa = 68.7*10^{3}\ Pa$

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Now given that the are is directly proportional to the square of the diameter [i.e $A= \frac{\pi d^2}{4}$ ]

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=> $A_2 = 4 A_1$

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=> $v_2 = \frac{v_1}{4}$

=> $v_2 = \frac{3.57}{4}$

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Generally the Bernoulli equation is mathematically represented as

$P_1 + \frac{1}{2} \rho v_1^2 + \rho * g * h_1 = P_2 + \frac{1}{2} \rho v_2^2 + \rho * g * h_2$

So

$P_2 = \rho * g (h_1 -h_2 )+P_1 + \frac{1}{2} * \rho (v_1^2 -v_2 ^2 )$

=> $P_2 = \rho * g (h_1 -(h_1 -18.3) + P_1 + \frac{1}{2} * \rho (v_1^2 -v_2 ^2 )$

substituting values

$P_2 = 1000 * 9.8 (18.3) )+ 68.7*10^{3} + \frac{1}{2} * 1000 ((3.57)^2 -0.893 ^2 )$

$P_2 = 254.01 kPa$

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