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3 years ago

What is the mystery behind black hole

2 answers:

lisabon 2012 [21]3 years ago

5 0

Well since the gravitational pull is so strong, nothing can escape from it which means we haven't been able to get close enough to really know everything about them. There's no way of knowing what truly goes on inside of them since there is no way out.

muminat3 years ago

3 0

Answer:

A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.

Explanation:

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Jane, looking for tarzan, is running at top speed (5.2 m/s) and grabs a vine hanging 4.5 m vertically from a tall tree in the ju

kumpel [21]

While Jane is running has a kinetic energy, which is Ek = 1/2*m*v^2 where m is mass and v is velocity  When she grabs a vine, she is going to change the kinetic energy to potential energy.
We know that potential energy is given by Ep = m*g*h where m is mass, g is gravity constant and h is height
So while running the kinetic energy is Ek = 1/2 * m * 5.2^2 = 13.52*m
Then all that energy is used to swing upward and gain potential energy
Ep = m*g*h = Ek = 13.52*m
m*9.8*h = 13.52*m
h = 13.52/9.8 = 1.38 meters
So Jane will swing 1.38 meters upward

8 0

3 years ago

Is a measure of how rapidly or slowly molecules move?

horsena [70]

Temperature is a measure of how rapidly or slowly molecules move.<span />

8 0

3 years ago

Read 2 more answers

A dentist using a dental drill brings it from rest to maximum operating speed of 391,000 rpm in 2.8 s. Assume that the drill acc

krek1111 [17]

Answer:

$\alpha = 2327.7 \ rev/s^2$

$\theta = 9124.5 \ rev$

Explanation:

From the question we are told that

The maximum angular speed is $w_{max} = 391000 \ rpm = \frac{2 \pi * 391000}{60} = 40950.73 \ rad/s$

The time taken is $t = 2.8 \ s$

The minimum angular speed is $w_{min}= 0 \ rad/s$ this is because it started from rest

Apply the first equation of motion to solve for acceleration we have that

$w_{max} = w_{mini} + \alpha * t$

=> $\alpha = \frac{ w_{max}}{t}$

substituting values

$\alpha = \frac{40950.73}{2.8}$

$\alpha = 14625 .3 \ rad/s^2$

converting to $rev/s^2$

We have

$\alpha = 14625 .3 * 0.159155 \ rev/s^2$

$\alpha = 2327.7 \ rev/s^2$

According to the first equation of motion the angular displacement is mathematically represented as

$\theta = w_{min} * t + \frac{1}{2} * \alpha * t^2$

substituting values

$\theta = 0 * 2.8 + 0.5 * 14625.3 * 2.8^2$

$\theta = 57331.2 \ radian$

converting to revolutions

$revolution = 57331.2 * 0.159155$

$\theta = 9124.5 \ rev$

6 0

2 years ago

7. What causes waves to bend?

lesantik [10]

Answer:

Refraction

Explanation:

Refraction is the change in direction of waves that occurs when waves travel from one medium to another. Refraction is always accompanied by a wavelength and speed change. Diffraction is the bending of waves around obstacles and openings.

7 0

3 years ago

Read 2 more answers

In a television picture tube, electrons strike the screen after being accelerated from rest through a potential difference of 27

aksik [14]

Answer:

$v = 9.88 \times 10^7 m/s$