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3 years ago

What is a black hole's escape velocity?

Physics

1 answer:

Igoryamba3 years ago

8 0

<h2><u>ANSWER</u></h2>

The simplest definition of a black hole is an object that is so dense that not even light can escape its surface. If we squished the Earth's mass into a sphere with a radius of 9 mm, the escape velocity would be the speed of light. Just a wee-bit smaller, and the escape velocity is greater than the speed of light.

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Roxy is driving down East Capitol Street. She drives 1380 meters in 45 seconds. Assuming she does not speedup or slow down, what

Natasha_Volkova [10]

Answer:

30.66667

Explanation:

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3 years ago

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Answer:

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3 years ago

Based on the law of conservation of energy, how can we reasonably improve a machine’s ability to do work?

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3 years ago

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Car A has twice the mass of Car B; both travel at the same speed. Compared to Car B. Car A has:

krek1111 [17]

Answer:

Car A has twice the energy of car B.

Explanation:

The kinetic energy of an object is given by :

$K=\dfrac{1}{2}mv^2$

Where

m is the mass

v is the speed of the object

Car A has twice the mass of Car B. Both travel at the same speed i.e.

$m_A=2m_B$

So,

$\dfrac{K_A}{K_B}=\dfrac{(1/2)m_Av^2}{(1/2)m_Bv^2}\\\\=\dfrac{2m_B}{m_B}\\\\\dfrac{K_A}{K_B}=2\\\\K_A=2\times K_B$

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3 years ago

Read 2 more answers

You drive 200 miles in 3 hours before stopping for lunch and gas. After lunch you

Paraphin [41]

Given :

You drive 200 miles in 3 hours before stopping for lunch and gas. After lunch you travel 250 miles in an hour and a half.

To Find :

Average speed.

Solution :

We know, average speed is given by :

$v=\dfrac{\text{Total distance covered}}{\text{Total time taken}}\\\\v=\dfrac{200+250}{3+1.5}\ miles/hr\\\\v=\dfrac{450}{4.5}\ miles/hr\\\\v=100\ miles/hr$

Therefore, average speed of the journey is 100 miles/hr.

Hence, this is the required solution.

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3 years ago