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3 years ago

Where does the name "Black Hole" get it's name?

Physics

2 answers:

jenyasd209 [6]3 years ago

8 0

nothing escapes them not even light therefore they are (dark) and we see them be literally black holes

Vikentia [17]3 years ago

4 0

The "Black Hole" gets its name from the astronomical amount of gravitational force created by the black hole. This gravitational force is so great that even light cannot escape it, hence, it is completely black

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What kingdom (Plantae, Fungi, Animalia, or Protista) does each organism belong to? (no links)

Kitty [74]

Answer:

Plantae: herbs, plants, trees, bushes, grass....

Fungi: yeasts, molds, mushrooms

Animalia: all animals (not prokaryotes nor protists)

Protista: amoebae, red algae, dinoflagellates, diatoms, euglena, and slime molds

6 0

3 years ago

Read 2 more answers

A block of mass 3.20 kg is placed against a horizontal spring of constant k = 865 N/m and pushed so the spring compresses by 0.0

Aliun [14]

Answer:

a) The initial elastic potential energy of the block-spring system is 28.113 joules.

b) The final speed of the block is approximately 4.192 meters per second.

Explanation:

a) By applying Hooke's law and definition of work, we define the elastic potential energy ( $U_{g}$ ), measured in joules, by the following formula:

$U_{g} = \frac{1}{2}\cdot k\cdot x^{2}$ (1)

Where:

$k$ - Spring constant, measured in newtons per meter.

$x$ - Deformation of the spring, measured in meters.

If we know that $k = 865\,\frac{N}{m}$ and $x = 0.065\,m$ , then the elastic potential energy is:

$U_{g} = \frac{1}{2}\cdot \left(865\,\frac{N}{m} \right) \cdot (0.065\,m)$

$U_{g} = 28.113\,J$

The initial elastic potential energy of the block-spring system is 28.113 joules.

b) According to the Principle of Energy Conservation, the initial elastic potential energy of the block-spring system becomes into translational kinetic energy, that is:

$U_{g} = \frac{1}{2}\cdot m\cdot v^{2}$ (2)

Where:

$m$ - Mass, measured in kilograms.

$v$ - Final speed, measured in meters per second.

Then, the final speed is cleared:

$v = \sqrt{\frac{2\cdot U_{g}}{m} }$

If we know that $U_{g} = 28.113\,J$ and $m = 3.20\,kg$ , then the final speed of the block is:

$v = \sqrt{\frac{2\cdot (28.113\,J)}{3.20\,kg} }$

$v \approx 4.192\,\frac{m}{s}$

The final speed of the block is approximately 4.192 meters per second.

3 0

3 years ago

help please what is the heat required in kilocalories to convert 2 kg of ice at 0°c completely into steam at 100°c? a. 80 calori

ivann1987 [24]

<span>Q = mL
</span>
We need to know the latent heat of fusion, L, for 0 degrees.

L = 336 kJ/kg, m = 2kg

where L is the latent heat for vaporization

Q = 2 * 336 = 672 kJ

For conversion between 0 and 100 degree Celsius

Q = mcθ, specific heat capacity = 4.2 kJ/kgK

Q = 2*4.2* (100 - 0) = 840 kJ

For conversion to steam at 100 degrees Celsius

<span>Q = mL , L = latent heat of vaporization = 2256 kj/kg
</span>
Q = 2 * 2256 = 4512 kJ

Total heat = 672 + 840 + 4512 = 6024 kJ

= 6 024 000 J

But 1 calorie = 4.2 J

Therefore 6 024 000 J will be: 6 024 000/4.2 ≈ 1 434 286 Calories

≈ 1 434 kCalories

4 0

3 years ago

Does newton all three of his laws have to do with the egg drop

andrew11 [14]

All a of Newton's laws have to do with gravity, he just happens to use eggs to prove his point.

8 0

3 years ago

The different between distance and displacement

balandron [24]

distance is metres in any direction ... displacement is distance in a given direction ... 1 mile versus 1 mile North

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3 years ago