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Stolb23 [73]
3 years ago
10

Juans mother drives 7.25 miles southwest to her favorite shopping mall. What is the average velocity of her automobile if she ar

rives at the mark in 20min?
Physics
1 answer:
Irina-Kira [14]3 years ago
5 0
21.75 Miles Per Hour

I got this by multiplying 7.25(3) because I know 20 minutes is 1/3 of 1 he
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What is the meaning of life? why are we here? what is the goal
DIA [1.3K]

Answer:

you are the one who gives meaning to your life, do what u want to do. try new things and just enjoy the good things that you alreadyknow u like. you shouldn't look at life as a competition or as a task that needs something to be done, just do whatever u want

7 0
2 years ago
Read 2 more answers
A steam power plant produces 500 MW of electricity with an overall thermal efficiency of 35%. Determine (a) the rate at which he
Margaret [11]

Answer:

Explanation:

500 MW = 500 X 10⁶ J / s

If R be the rate of heat supplied and 35 % is the efficiency of conversion

R x .35 = 500 X 10⁶

R =  500 X 10⁶ / .35

= 1428.57 x 10⁶ J / s

b )

Rate of heat going waste

= .65 x 1428.57 x 10⁶

= 928 .57 x 10⁶ J / s

c )

Heat content of coal = 30 x 10⁶ J /kg

1428.57 x 10⁶ J of heat will come from

= 1428.57 x 10⁶ J  / 30 x 10⁶ J /kg

= 47.62 kg per second

= 47.62 x 24 x 60 x 60 =  4114368 kg in one day

= 4114368 / 907.185 ton per day  

= 4535.31 ton per day

d ) Fuel consumption rate  will decrease by 12.5  % if thermal efficiency is increased to 40 % .  

3 0
3 years ago
If the Universe was born at the Big Bang, what existed before then?​
Aleonysh [2.5K]
<h2>Answer:</h2>

<em>Hey, </em>

<h3><u>QUESTION)</u></h3>

This is a complicated question that would be debated by many physicists. How to answer this question when we are struggling with the genesis of the universe? Many theories on the origin of the universe have been put forward, but the Bing Bang is probably, or at least to date, the most likely theory. If today the universe is expanding, some astronomers hypothesise that before the Bing Bang the universe already existed but that it was condensing, according to this hypothesis the Bing Bang would correspond to the limit point of compression of the universe.  

But if we remain in the traditional theory the Bing Bang is at the origin of all the matter we know, as well as light. Before the Bing Bang, in other words before the universe, there was NOTHING.

8 0
3 years ago
Please help me i need some help!!!
Montano1993 [528]

Answer:

D on first page

I think on the second page is also D

The third page is B

Explanation:

5 0
3 years ago
Which of the following is a graph of the velocity of an object as it falls fromrest if drag is not ignored? Explain your choice
MariettaO [177]

The air drag is a force that depends on the speed of an object relative to the wind. Under certain conditions, it can be modeled as:

F=-bv

Where b is a constant.

As a falling object reaches a speed so that its weight is cancelled out by the air drag, the object will reach a maximum velocity.

In a speed vs time gaph, the speed would approach the maximum speed like an asymptote.

On the other hand, since the object falls from rest, the initial speed on the graph must be zero.

Taking these considerations into account, the correct graph for the movement of an object that falls from rest if air drag is not ignored, is option B.

7 0
1 year ago
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