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3 years ago

What are the scientific mesurments ordered from greatest to least

Physics

1 answer:

Sveta_85 [38]3 years ago

5 0

Meters Micrometers centimeters millimeters

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A circular sign has a diameter of 40 cm and is subjected to normal winds up to 150 km/h at 10°C and 100 kPa. Determine the drag

Marat540 [252]

Answer:

147.7 N

221.55 Nm

Explanation:

P = Pressure = 100000 Pa

$R_s$ = Mass-specific gas constant = 287.015 J/kg k

T = Temperature = 10+273 = 283 K

C = Drag coefficient = 1.1

A = Area

r = Radius = 0.2 m

v = Speed of wind = $\frac{150}{3.6}\ m/s$

L = Length of pole

Density

$\rho=\frac{P}{R_sT}\\\Rightarrow \rho=\frac{100000}{287.058\times 283}\\\Rightarrow \rho=1.2309\ kg/m^3$

Drag force

$F=\frac{1}{2}\rho CAv^2\\\Rightarrow F=\frac{1}{2}\times 1.2309\times 1.1\times \left(\pi \times 0.2^2\right)\times \left(\frac{150}{3.6}\right)^2\\\Rightarrow F=147.7\ N$

Force on the circular sign is 147.7 N

$M=F\times L\\\Rightarrow M=147.7\times 1.5\\\Rightarrow M=221.55\ Nm$

Bending moment at the bottom of the pole is 221.55 Nm

6 0

3 years ago

When n liters of fuel were added to a tank that was already 1 3 full, the tank was filled to 7 9 of its capacity. In terms of n,

Zarrin [17]

Answer: 9/4n

Explanation:

Let's take T to represent tank

When n litres of fuel was added to tank that was 1/3 full = n + 1/3T

The tank was 7/9T

n+1/3T = 7/9T

n =7/9T - 1/3T

n = 4/9

If a full tank is taken to be 1 = 9/9

Hence, we will have 1 = x × n

1 = x × 4/9

x = 9/4

Hence 9/4 of n = 9/4n

8 0

3 years ago

An object starts from rest and slides with negligible friction down an air track tipped at an angle theta from the horizontal. A

Alex Ar [27]

Answer:

The value of θ can be determined by slope of graph as function of square of time.

Explanation:

Lets take

Mass = m

Angle of inclination =θ

From diagram

mg sinθ = m a

a=g sinθ

We know that

$S=ut+\dfrac{1}{2}at^2$

Given that block is in rest position initially.

u= 0

$S=\dfrac{1}{2}(gsin\theta ) t^2$

We can say that

S∝ t² If we assume that t and x and S as y y= m x

$S=\dfrac{1}{2}(gsin\theta ) t^2$

Here slope ,m

$m=\dfrac{1}{2}(gsin\theta )$

So the value of θ can be determined by slope of graph as function of square of time.

6 0

3 years ago

Which of these objects would be most likely to create this sound wave?

babunello [35]

Answer: It’s C.

Explanation:

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3 years ago

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What is the twisted ladder shape of the DNA called? 3D model nucleotides double helix single strand

jeyben [28]

Answer: double helix

Explanation: Double helix is the description of the structure of a DNA molecule. A DNA molecule consists of two strands that wind around each other like a twisted ladder. Each strand has a backbone made of alternating groups of sugar (deoxyribose) and phosphate groups.

Hope this helps

Plz mark brainleist

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3 years ago

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