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Olenka [21]
3 years ago
6

An ideal fl uid fl ows through a horizontal pipe having a diameter that varies along its length. Does the sum of the pressure an

d kinetic energy per unit volume at different sections of the pipe
Physics
1 answer:
SOVA2 [1]3 years ago
7 0

Answer:

The sum of kinetic and pressure energy Increases as the pipe diameter increases.

Explanation:

An everyday occurrence and practical of this question have to do with you holding a water hose.A reduction in the size of the outlet cause the an increase in pressure and  a gain in kinetic energy.Little wonder how gardeners are able to properly water flowers at far distances.

This can be backed with Bernoulli’s theorem about total energy.

If the pipe is not of constant cross section, then the velocity of the water flowing will be inversely proportional to the pipe’s cross-sectional area.

The kinetic energy of the water is proportional to the square of the flow velocity.This energy will be highest where the cross-section is least.

So where the Kinetic energy is maximum, the pressure energy is minimum,thereby favoring an increase in the sum of pressure and kinetic energy per unit volume.

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Describe how engineers designed a parachute to create the forces needed to slow down the falling person.
shepuryov [24]

Answer:

Due to the resistance of air, a drag force acts on a falling body (parachute) to slow down its motion. Without air resistance, or drag, objects would continue to increase speed until they hit the ground. The larger the object, the greater its air resistance. Parachutes use a large canopy to increase air resistance. Also, Once the parachute is opened, the air resistance overwhelms the downward force of gravity. The net force and the acceleration on the falling skydiver is upward. An upward net force on a downward falling object would cause that object to slow down. The skydiver thus slows down. Sorry if not helpful.

8 0
3 years ago
A mechanic needs to replace the motor for a merry-go-round. The merry-go-round should accelerate from rest to 1.5 rad/s in 6.0s
pashok25 [27]

Answer:

109656.25 Nm

Explanation:

\omega_f = Final angular velocity = 1.5 rad/s

\omega_i = Initial angular velocity = 0

\alpha = Angular acceleration

t = Time taken = 6 s

m = Mass of disk = 29000 kg

r = Radius = 5.5 m

\omega_f=\omega_i+\alpha t\\\Rightarrow \alpha=\dfrac{\omega_f-\omega_i}{t}\\\Rightarrow \alpha=\dfrac{1.5-0}{6}\\\Rightarrow \alpha=0.25\ rad/s^2

Torque is given by

\tau=I\alpha\\\Rightarrow \tau=\dfrac{1}{2}mr^2\alpha\\\Rightarrow \tau=\dfrac{1}{2}29000\times 5.5^2\times 0.25\\\Rightarrow \tau=109656.25\ Nm

The torque specifications must be 109656.25 Nm

5 0
3 years ago
Help me please i’ll pay you (paypal)
Arisa [49]

If the award weighs 200 newtons and 200 newtons equals 44.96 pounds of force even though it is of such a force if it hits the ground the energy will either discharge into the air doing nothing but creating a loud sound or it will discharge into the ground altering the ground that it landed on.

Hope this helps :)

8 0
3 years ago
ANSWER FOR 50 POINTS AND BRAINLIEST!
Nezavi [6.7K]

Answer:

From the deepest ocean trench to the tallest mountain, plate tectonics explains the features and movement of Earth's continents/ surface in the present and the past. Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle called convection, the rocky inner layer above the core which has a high density.

Explanation:

8 0
3 years ago
A bowling ball of 35.2kg, generates 218 kg.m/s units of momentum. What is the velocity of the bowling ball?
brilliants [131]

Answer:

6.18\:\mathrm{m/s}

Explanation:

The momentum of an object is given by p=mv.

Plugging in values, we have:

218=35.2v,\\v=\frac{218}{35.2}=\fbox{$6.18\:\mathrm{m/s}$}.

8 0
3 years ago
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