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shtirl [24]
3 years ago
11

What is the universe made of? Astronomers face an embarrassing conundrum: they don't know what 95% of the universe is made of​

Physics
1 answer:
rewona [7]3 years ago
3 0

Answer:

This what they all been waiting for

I guess so

They been waiting for this sh,it for a long time didn't they

I'ma give it everything I got

Ayo Dougie park that X6 around the corner

Aye I'm just feeling my vibe right now

I'm feeling myself

Explanation:

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The following are all potential explanations for the motion of sailing rocks, but not all of them are scientific hypotheses give
AleksAgata [21]

Answer:

As we know that science is based upon logic. So the scientific theories have a logical reasoning behind them. So considering that in mind, scientific hypothesis include the motion of sailing rocks by animals, wind, flowing water, magnetic field, humans and gravity. The motion of the rocks by ghosts, God and magic are not scientific theories as we can not prove them logicaly.

Explanation:

6 0
3 years ago
Four equal masses M are spaced at equal intervals (each of length d) along a horizontal, straight rod whose mass can be ignored.
Mars2501 [29]

Answer:

a) 14Md^{2}

Explanation:

a)The inertia of a particle moving in a circular axis is given by,

I=Mr^{2} \\

I = Moment of inertia

M = mass of the particle

r = perpendicular distance from axis of rotation.

And by adding moment of inertia of each particle we can come to the moment of inertia of the system.

I = M(0d)^{2}+Md^{2} +M(2d)^{2}+M(3d)^{2}

 = 14Md^{2}

b) Your question is incomplete but I'll write how to find the minimum force required  to give a system given angular acceleration.

Minimum force is found when applied from the furthest point to the axis of rotation in the system.

, by τ = Fr, whereτ = torque , F = Force ,  = perpendicular distance from axis of rotation.

For minimum force r = 3d

And also τ = Iα where I = Moment of inertia and α = angular acceleration

By combining the two equations you get minimum force as,

F = Iα/r

F' = 14Md^{2}α/3d

  = 14Mαd/3

7 0
3 years ago
If an electric water heater uses 40 kW of power and runs for 8 hours, what is the total amount of energy used?
laila [671]

i just took the test, the answer is d.  320 kilowatt-hours

6 0
3 years ago
8. A tortoise moves a distance of 100 metres in 15 minutes. What is the average speed of
myrzilka [38]
Answer: 0.4 km/h



100 m = 0.1 km
15min./60min. = 0.25 hr

so, divide the total distance (100 m) by the total time (15 min)
0.1 km/0.25 hr = 0.4
8 0
3 years ago
Consider the following sets of sample data: A: 136, 99, 118, 134, 120, 130, 131, 135, 115, 118, 118, 136, 133, 110 B: 3.51, 3.66
Paha777 [63]

Answer:

CV =0.1 , for set A

CV=0.2 , for set B

Explanation:

Check attachment for solution

6 0
3 years ago
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