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astraxan [27]
3 years ago
14

Measurement of structure in the cosmic microwave background radiation has recently indicated that we live in a flat universe bet

ween a closed and an open universe, and yet the measured density of detected matter and radiation is only 20–40% of the critical density required for a flat universe. In what form is the other 60–80% of the "matter" thought to be?
Physics
1 answer:
Rasek [7]3 years ago
6 0

Answer:

lies

Explanation:

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Snezhnost [94]

Answer:

the cognitive abilities of an individual to learn from experience to reason well, and to cope effectively with the demands of daily living

Explanation:

Yes that can be understood by a simple example

Suppose two people are in exam

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4 0
2 years ago
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Waves that move by replacing particles
AnnyKZ [126]
What’s the question
8 0
4 years ago
What happens to the focal length of a converging lens when it is placed under water?
IceJOKER [234]

Answer:

When a converging lens is placed under water then its focal length increases.

Explanation:

When any lens, be it converging or diverging is immersed into water then the speed of light before and after the refraction through the lens has less speed and due to less difference in speed it shows less deviations as a result the focal length is increased for the lenses.

Lesser the difference between the refractive index of the medium and the lens glass greater becomes its focal length.

<u>The focal length of the lens immersed in a medium is given by:</u>

\frac{1}{f} =\frac{n_l-n_m}{n_m} \times (\frac{1}{R_1} +\frac{1}{R_2} )

where:

n_l= refractive index of the glass material with resp. to air

n_m= refractive index of the medium with resp. to air

R_1\ \&\ R_2= radii of curvature of the two surfaces of the lens

7 0
3 years ago
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A Ferris wheel with a diameter of 35 m starts from rest and achieves its maximum operational tangential speed of 2.3 m/s in a ti
SCORPION-xisa [38]
Final angular speed
ω = v / r = 2.20m/s / ½*35.0m = 0.126 rad/s
and so prior to reaching that final speed
the angular acceleration
α = Δω / Δt = 0.126rad/s / 15.0s = 0.00838 rad/s² ◄
and the tangential acceleration
a = Δv / Δt = 2.20m/s / 15.0s = 0.147 m/s² ◄
OR
a = αr = 0.00838rad/s² * ½*35.0m = 0.147 m/s² ◄
8 0
3 years ago
What will be the magnitude of the force of a satellite of mass 1000kg if the orbit were not close to the surface of the Earth bu
Nesterboy [21]

Answer: F = Gm·M/R²

Explanation: you need to calculate gravitational force.

M = mass of Earth

G = gravitational constant 6.67·10^-11 Nm²/ kg²

R= 6378 km ( also double this)

And mass of satellite is 1000 kg

7 0
3 years ago
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