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Mama L [17]
3 years ago
6

What is a black hole

Physics
1 answer:
AURORKA [14]3 years ago
6 0

A black hole is a place in space where gravity pulls so much that even light can not get out.

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How does the way that matter cycles through an ecosystem differ from the way that energy flows?
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3 years ago
A) Julie is running to the right at 5 m/s, as shown in the 1st figure. Balls 1 and 2 are thrown toward her at 10 m/s by friends
Svetach [21]

Part 1)

here Julie is running at speed 5 m/s

So here two balls are thrown at speed 10 m/s towards Julie with respect to her friend standing on the ground.

So here this all speed is real speed of all.

Now as per Anita (let say she is one of her friend standing on ground) the speed of two balls will be same as the given speed as she is observing from ground or stationary frame

As per the frame of Julie

speed of ball 1

v_{1j} = v_1 - v_j

v_{1j} = 10 - 5 = 5 m/s towards her in same side

speed of ball 2

v_{2j} = v_2 - v_j

v_{2j} = -10 - 5 = -15 m/s towards her from opposite side

Part b)

Now in this case the speed of two balls is given with respect to Julie

so we can say

for ball 1

v_{1j} = v_1 - v_j

10 = v_1 - 5

so in ground frame speed of ball 1 is

v_1 = 15 m/s

Similarly for ball 2

v_{2j} = v_2 - v_j

-10 = v_2 - 5

So speed in ground frame of ball 2 is

v_2 = - 5 m/s

so its 5 m/s from opposite side

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3 years ago
Which of the following is NOT a characteristic of a state?
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There are four characteristics of a state. population,government,sovereignty,and territory. 
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You can comfortably hold your fingers close beside a candle flame, but not very close above the flame. why? challenge (optional)
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The candle flame releases hot gases, which directly go in upwards directions. Due to which the air near the flame of the candle is very hot and dense. The particles along with vapour move up. And since the sideways, the air is not very dense and hot, we are able to hold the candle. In anti-gravity region, there will be no density differences and also, the convection process wont occur. So, the candle quickly snuffs off.
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The express train can travel 100 miles per hour. This information describes the train'sAnsweracceleration.direction.speed.veloci
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Velocity because it gives the displacement and time
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