3 years ago

Which best explains why a wood- burning fireplace represents an open system?

Physics

2 answers:

Anna11 [10]3 years ago

6 0

D. Fire requires oxygen

11111nata11111 [884]3 years ago

4 0

D-Because a fire requires oxygen from the atmosphere to burn

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oksano4ka [1.4K]

If u mean pressure, pressure = Force/Area
Correct me if I am wrong :D

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2 years ago

You work at a garden store for the summer, and you lift a 14 kg bag of fertilizer with a force of 227 N.

nika2105 [10]

Answer:

(a) Acceleration of the bag will be a=16.214m/sec^2

(B) Weight of the bag will be 137.2 N

Explanation:

We have given mass of the bag m = 14 kg

Force with which bag is lifted = 227 N

(A) According to newtons law we force is equal to F = ma , here m is mass and a is acceleration

So $227=14\times a$

$a=16.214m/sec^2$

(b) Acceleration due to gravity $g=9.8m/sec^2$

We know that weight is given by W = mg , here m is mass and g is acceleration due to gravity

So weight $W=mg=14\times 9.8=137.2N$

So weight of the bag will be 137.2 N

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3 years ago

.A particle starts on the origin. It is pushed back to -5.7 m in 2.1 s. Then it is pushed

harina [27]

Answer: The average velocity is -0.965m/s

Explanation: The first step is to calculate the two velocities is both directions. A velocity is a distance per unit time.

V=d/ t

=-5.7/2.1

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For the other direction the velocity is

V=7.3/9.5

=0.77m/s

The average velocity the add the velocities and divide them by 2.

V=-2.7+0.77/2

V= 0.965m/s

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2 years ago

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What are the cells in your body

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Each cell has a size and shape that is suited to its job.

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3 years ago

Jeremy walked at an average rate of speed of 5 km/h. how far had Jeremy walked in 15 minutes?

astraxan [27]

Answer:

1 half kilometer is right answer

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2 years ago

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