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4 years ago

Why should a spacecraft be airtight.

1 answer:

7 0

Pressure outside of a spacecraft is different from pressure inside the spacecraft. If it is not airtight. It will cause an explosion due to fast pressure change!

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You are asked to find a set of dimensionless parameters to organize data from a laboratory experiment, in which a tank is draine

mihalych1998 [28]

Answer:

Step 1

Given: A tank is drained through an orifice from initial liquid level (h₀). The time(r), to drain the tank, depends on tank diameter (D), orifice diameter (d), acceleration due to gravity (g), liquid density (ρ) and liquid viscosity (μ).

r = f (h₀, D, d, g, ρ, μ)

Step 2

There are totally seven parameters r, h₀, D, d, g, ρ and μ

∴ n = 7

The primary variables are M, L, T

∴ m = 3

So, the number of repeating variables are, r = 3

Select the three repeating variables are ρ, d, g

Then according to Buckingham, there will be n-m (⇒ 7-3 = 4) dimensionless groups given by π₁, π₂, π₃ and π₄

So, The number of π terms = 4

Explanation:

See attached images for step 3 to 7

6 0

3 years ago

You are walking around your neighborhood and you see a child on top of a roof of a building kick a soccer ball. The soccer ball

const2013 [10]

Answer:

The building is 61.19 m tall, approximately.

Explanation:

From the parabollic movement trayectory equation,

$y=H+\frac{v_{0y}}{v_x}x-\frac{1}{2v_x^2}gx^2,$

where H is the initial height of the ball and $v_{oy}$ and $v_x$ the inital velocities in the vertical and horizontal direction, respectively; we have

$H=y-\frac{v_{0y}}{v_x}x+\frac{1}{2v_x^2}gx^2$ .

In this case, the ball landed at the coordinates $\left(x,y\right)=\left(61,0\right)$ , so

$H=0-\frac{17\sin\left(43\deg\right)}{17\cos\left(43\deg\right)}\times 61+\frac{1}{2\left(17\cos\left(43\deg\right)\right)^2}\times 9.81\times 61^2 \approx 61.19$ .

8 0

3 years ago

A 36 N net force acts on an 9 kg rock. What is the acceleration of the rock? *

Anna007 [38]

Answer:

f=ma

therefore we have f=36N

m=9kg

a=f/m

36/9

=4m/s^2

Explanation:

3 0

3 years ago

Object A is negatively Charged. object A and Object B attract. Object B and Object C repel. Object C and Object D attract. What

3241004551 [841]

Remember opposites attract and same charges repel each other.

Object A= negatively charged.

Object A and B attract so B must be positively charged.

Object B and C repel so because B is positively charged C must also be positively charged.

Object C and D attract and because C is positively charged, D must be negatively charged.

5 0

4 years ago

If launched at the right speed, what could eventually happen to objects launched from Newton's theoretical cannon on the top of

Nadusha1986 [10]

If the speed is higher than the orbital velocity, but not high enough to leave Earth altogether (lower than the escape velocity), it will continue revolving around Earth along an elliptical orbit. (D) for example horizontal speed of 7,300 to approximately 10,000 m/s for Earth.

4 0

3 years ago