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nirvana33 [79]
3 years ago
14

Select the correct answer.

Physics
1 answer:
spin [16.1K]3 years ago
7 0

Answer:

There isnt enough in your question to answer the question bro, like we need a picture or something bro.

Explanation:

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What causes air to become less dense and rise?
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That force is 'gravity'.

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A 20 kg crate of books is at rest on a table. what is the normal force on the books?
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The weight of 20 kg is

                             (mass) x (gravity) =

                                   (20 x 9.8) = 196 newtons, downward.

There must be a force of 196 newtons upward on the mass. 
Otherwise the mass is accelerating either up or down.
 
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what system helps the body maintain homeostasis by giving it the nutrients it needs to perform different functions
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<span>The Cardiovascular system is the system that helps the body maintain homeostasis by giving it the nutrients it needs to perform different functions</span>
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A vertical piston cylinder device is being used to heat water. the piston has a mass of 20 kg and a cross sectional area of 100
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A boiling pot of water (the water travels in a current throughout the pot), a hot air balloon (hot air rises, making the balloon rise) , and cup of a steaming, hot liquid (hot air rises, creating steam) are all situations where convection occurs. 
Read more on Brainly.com - brainly.com/question/1581851#readmore
7 0
4 years ago
PLSSSS Jenny runs every morning for exercise she takes 25 minutes to run 1,000 m and walk 1,600 m or 20 minutes to run 2,000 m a
ELEN [110]

The running speed of Jenny willl be 2.5 times the velocity she walks.

<h3 /><h3>What is velocity?</h3>

The change of distance concerning to time is defined as speed. Speed is a scalar quantity. It is a time-based component. Its unit is m/sec.

Condition 1;

She takes 25 minutes to run 1,000 m and walk 1,600 m The total time to run as well as the walk is 25 minutes.

\rm  t = t_r +t_w \\\\ 25 =  t_r +t_w

As we know that;

Distance = speed × time

\rm x_r = v_r \times t_r \\\\ t_r = \frac{x_r}{v_r}

For walking;

\rm t_w = \frac{x_w}{v_w}

\rm  t = t_r +t_w \\\\ 25 = \frac{x_r}{v_r} +\frac{x_w}{v_w} \\\\  25 = \frac{1000 \ m}{v_r} +\frac{1600 \ }{v_w} \\\\ 40 v_w +64 v_r = v_rv_w

Same as for condition 2;

\rm 100 v_w + 40 v_r = v_rv_w

\rm 40 v_w +64 v_r =\rm 100 v_w + 40 v_r \\\\ v_r = 2.5 v_w

Condition 3;

\rm d_w = 800 \ m

\rm d_w = v_w \times t_w

\rm t_w  = \frac{d_w}{v_w } \\\\ \rm t_w  = \frac{800}{v_w } \\\\

Hence their running speed of Jenny willl be 2.5 times the velocity at she walks.

To learn more about the velocity, refer to the link: brainly.com/question/862972.

#SPJ1

5 0
2 years ago
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