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blsea [12.9K]
3 years ago
12

What do we mean by the event horizon of a black hole?

Physics
1 answer:
Evgen [1.6K]3 years ago
8 0

It is the point in a black hole where nothing, not even light, can escape from.

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Difference between upthrust force and normal reaction force.
irakobra [83]

Answer:

Explanation:

Both are contact forces arising at the interface between two bodies. In the fluid this interface might be irregular, and it completely surrounds a submerged object. For a solid it is usually a single flat surface - but it can be a collection of surfaces, which do not need to be flat or regular, and which can surround the object

Upthrust occurs at a fluid-solid interface whereas normal reaction occurs at a solid-solid surface. However, it is possible to generate the same fluid-like phenomenon of upthrust by immersing a solid object in sand or small beads and agitating them to simulate the pressure of atoms. With 

7 0
2 years ago
Select the correct answer. A truck moves 60 kilometers east from point A to point B. At point B, it turns back west and stops 15
katovenus [111]

Answer:

Option a

Explanation:

8 0
3 years ago
Items Item 3 How much force is needed to cause a 15 kilogram bicycle to accelerate at a rate of 10 meters per second per second?
Sergeeva-Olga [200]

Net force = (mass) x (acceleration) . . . . that's Newton's 2nd law of motion

Net force = (15 kg) x (10 m/s²)

<em>Net force = 150 Newtons</em>

6 0
3 years ago
If one sound wave has twice the amplitude of another the first sound is​
aleksley [76]

Answer:

if one wave has a negative displacement, the displacements would be opposite each other, so the displacement where the waves overlap is less than it would be due to either of the waves separately.

-causes a moment where the net displacement of the medium is zero. energy of waves hasn't vanished, but it is in the form of the kinetic energy of the medium

-then both emerge unchanged

Explanation:

4 0
3 years ago
A grating has 320 lines/mm. How many orders of the visible wavelength 551 nm can it produce in addition to the m = 0 order
Anastaziya [24]

Answer:

6

Explanation:

Given that

dsinθ = mλ,

now, if sinθ = 1, then

m = d / λ, where

m = order of interference

d = distance between the slits

λ = wavelength of light

this is the formula we would use to solve the question

d = 1 / 320 lines/mm

d = 1 / 320*10^3

d = 3.125*10^-6 m

At λ = 551 nm, we have

m = 3.125*10^-6 / 551*10^-9

m = 5.67

5.67 ~ 6

thus, we can say that the orders of visible wavelength 551 nm, can produce is 6

4 0
3 years ago
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