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3 years ago

Long-Distance Space Travel

Physics

2 answers:

wel3 years ago

7 0

Answer:

Green house

Explanation:

You could build a little green house sorta thing bc plants produce oxygen and then the plants you can eat also you are supposed to have water so there s the plants water!

nadya68 [22]3 years ago

6 0

Answer:

hmm hmm

lemme think

Explanation:

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if a body of mass 2kg travels with 2 m/s and other body of mass 2kg travels with 1m/s then find v1 and v2 in given statement

KIM [24]

Answer:

Your answer is here,

Explanation:

v1 = 4 kg m/s

v2 = 2 kg m/s

8 0

3 years ago

An ambulance is traveling east at 61.9 m/s. Behind it there is a car traveling along the same direction at 28.5 m/s. The ambulan

inessss [21]

Answer: 0.4 m

Explanation:

Given

Speed of ambulance, vs = 61.9 m/s

Speed of car = 28.5 m/s

Frequency of ambulance siren, f = 694 Hz

Velocity of sound in air, v = 343 m/s

With speed of ambulance being (61.9 m/s) -> We solve using

fd = f(v + vr) / (v - vs), where vr = 0

fd = 694 * (343 + 0) / (343 - 61.9)

fd = 694 * (343 / 281.1)

fd = 694 * 1.22

fd = 847 Hz

Recall,

λ = v/f

λ = 343/847

λ = 0.4 m

Therefore, the wavelength of the sound of the ambulance’s siren if you are standing at the position of the car is 0.4 m

7 0

3 years ago

An intergalactic rock star bangs his drum every 1.50 s. A person on earth measures that the time between beats is 2.70 s. How fa

sineoko [7]

Answer:

v = 83.1 % of speed of light

Explanation:

given,

T_e is the earth time = 2.7 s

T_s is the ship time = 1.5 s

we know,

$T_s = T_e \times \gamma$

where c is the speed of light

v is the speed of the rock star moving

$T_s = T_e\times \sqrt{1-\dfrac{v^2}{c^2}}$

$1.5= 2.7\times \sqrt{1-\dfrac{v^2}{c^2}}$

$\sqrt{1-\dfrac{v^2}{c^2}} =0.556$

squaring both side

$1-\dfrac{v^2}{c^2}=0.3086$

$v^2=0.6914c^2$

v = 0.831 c

v = 83.1 % of speed of light

7 0

3 years ago

Water at 25°C and 1 atm is flowing over a long flat plate with a velocity of 14 m/s. Determine the distance from the leading edg

Gre4nikov [31]

Answer:

L=31.9 mm

δ = 0.22 mm

Explanation:

Given that

v= 14 m/s

ρ=997 kg/m³

μ= 0.891 × 10⁻3 kg/m·s

As we know that when Reynolds number grater than 5 x 10⁵ then flow will become turbulent.

$Re=\dfrac{\rho vL}{\mu}$

$L=\dfrac{Re\mu}{\rho v}$

$L=\dfrac{5\times 10^5\times 0.891\times 10^{-3}}{ 14 \times 997}\ m$

L=0.0319 m

L=31.9 mm

The thickness of the boundary layer at that location L given as

$\delta =\dfrac{5L}{\sqrt{Re}}$

$\delta =\dfrac{5\times0.0319}{\sqrt{5\times 10^5}}$

δ = 0.00022 m

δ = 0.22 mm

7 0

3 years ago

Who invented the mercury barometer and what is it used to measure?

Aleksandr [31]

<span> its a instrument for measuring atmospheric pressure that was invented by </span>Evangelista Torricelli

8 0

3 years ago

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