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2 years ago

What is the difference between displacement thickness and momentum thickness?

1 answer:

7 0

The thickness that is added to the displacement thickness to achieve the same flux of momentum in the real flow and the fictitious flow is known as the momentum thickness.

<h3>What is thickness of momentum?</h3>

The distance that, when multiplied by the square of the free stream velocity, equals the integral of the momentum defect is known as the momentum thickness. The whole loss of momentum flux, on the other hand, is comparable to the removal of momentum over a distance.

<h3>What does "displacement thickness" mean to you?</h3>

Displacement thickness is essentially the distance, measured perpendicular to the solid body's border, by which the boundary should be moved in order to make up for the flow rate reduction caused by the creation of boundary layers.

<h3>How can I calculate the Reynolds number for momentum thickness?</h3>

The relationship between static density, static velocity, viscosity, and boundary-layer momentum thickness is calculated using the Reynolds number equation using the boundary-layer momentum thickness formula, which is defined as Reynolds Number = (Static density*Static velocity*Boundary-layer momentum thickness for transition)/.

learn more about displacement thickness and momentum thickness here

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Which vector should be negative?

pentagon [3]

Answer:

The velocity of a falling object

Explanation:

The positive X axis is towards right and positive Y axis is towards up, so North direction is positive

A vector with less than 1 magnitude is not negative, because its magnitude may be in between 0 and 1 which is positive vector.

Any vector whose magnitude is greater than 1 is never be a negative vector.

The velocity of a falling object is towards bottom, that is towards negative Y axis. So that vector is negative.

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3 years ago

The free-fall acceleration on Mars is 3.7 m/s2.

hichkok12 [17]

Answer:

(a) The length of the pendulum on Earth is 36.8cm

(b) The length of the pendulum on Mars is 13.5cm

(d) Mass suspended from the spring on Mars is 0.36kg

Explanation:

Period = 1.2s, free fall acceleration on Earth = 9.8m/s^2, free fall acceleration on Mars = 3.7m/s^2

( a) Length of pendulum on Earth = [( period ÷ 2π)^2] × acceleration = (1.2 ÷ 2×3.142)^2 × 9.8 = 0.0365×9.8 = 0.358m = 35.8cm

(b) Length of the pendulum on Mars = (1.2÷2×3.142)^2 × 3.7 = 0.0365×3.7 = 0.135cm = 13.5m

(c) Mass suspended from the spring on Earth = (force constant×length in meter) ÷ acceleration = (10×0.358) ÷ 9.8 = 0.37kg

(d) Mass suspended from the spring on Mars = (10×0.135)÷3.7 = 0.36kg

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3 years ago

A car starts from rest and travels for 5.8 s with a uniform acceleration of 1.6 m/s² in the negative direction. What is the fina

elena-s [515]

Answer:

Final velocity of the car will be -9.28 m/sec

Explanation:

We have given that the car starts from the rest so initial velocity of the car u = 0 m /sec

Acceleration of the car $a=1.6m/sec^2$ in negative direction so acceleration will be $a=-1.6m/sec^2$

From first equation of motion we know that

v = u+at

So $v=0+(-1.6)\times 5.8=-9.28m/sec$

So final velocity will be -9.28 m/sec

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4 years ago

Calculate the inhomogeneity of a 1.5 t magnet

Ludmilka [50]

Need more answer choices

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3 years ago

A mass of 2000 kg is raised 5.0 m in 10 seconds what is the potential energy of the mass at this height?

kvv77 [185]

Answer:

A. 98,000 J

Explanation:

The gravitational potential energy of an object is given by

U = mgh

where

m is the mass of the object

g is the gravitational acceleration

h is the heigth above the ground

In this problem,

m = 2000 kg

g = 9.8 m/s^2

h = 5.0 m

Substituting into the equation, we find

$U=(2000 kg)(9.8 m/s^2)(5.0 m)=98,000 J$

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4 years ago