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Nookie1986 [14]
3 years ago
13

What is the mystery Greene discussion and why does he say it is something we should all care about ​

Physics
1 answer:
Step2247 [10]3 years ago
6 0

Answer:

The mystery that Greene discusses is that dark energy is causing the expansion of the universe to accelerate. However, this cannot be explained by the laws of Physics.

Explanation:

I majored in Physics

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A seesaw has an irregularly distributed mass of 50 kg, a length of 3.0 m, and a fulcrum beneath its midpoint. It is balanced whe
Simora [160]

Answer:

d_{CM} = 0.78 m

Explanation:

given,

mass of seesaw,m= 50 kg

length of seesaw, d = 3 m

mass of person on one end, m₁ = 60 Kg

mass of person on another end, m₂ = 86 Kg

position of center of mass = ?

System is in equilibrium

Clockwise moment is equal to anticlockwise moment.

m_1 g\dfrac{d}{2} + m g d_{CM} = m_2 g \dfrac{d}{2}

m_1 d + 2 m d_{CM} = m_2 d

d_{CM} = \dfrac{m_2 d-m_1 d}{2 m}

d_{CM} = \dfrac{86\times 3 - 60\times 3}{2\times 50}

d_{CM} = 0.78 m

hence, the position of center of mass from the fulcrum is 0.78 m on 60 Kg mass side.

4 0
3 years ago
What is a tornado any body pls help
Vinvika [58]
A tornado<span> is a violent rotating column of air extending from a thunderstorm to the ground. The most violent</span>tornadoes<span> are capable of tremendous destruction with wind speeds of up to 300 mph. They can destroy large buildings, uproot trees and hurl vehicles hundreds of yards. They can also drive straw into trees.
Hope this is of great help to you!
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3 0
3 years ago
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If matter cannot be created nor destroyed the how was matter created
Assoli18 [71]
It can’t be created nor destroyed although it can be changed from one form to the other

I hope this helps

Have a happy holidays:)
7 0
3 years ago
A certain shade of blue has a frequency of 7.24 × 1014 Hz. What is the energy of exactly one photon of this light?
ANEK [815]
E = hf

E = 6.63* 10 ⁻³⁴ * 7.24* 10¹⁴

<span>E = 4.80012 × 10⁻¹⁹ J</span>
4 0
3 years ago
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A metaphor is:
ivolga24 [154]
A metaphor is<span> a comparison between two non related objects where the first object is said to be equal to the second.</span>

The answer is d.
6 0
3 years ago
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