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kobusy [5.1K]
3 years ago
8

8. Humans need oxygen to break down food in order to provide energy for cells. The oxygen needed for this process is delivered b

y an organ system called the A. respiratory system. B. lungs. C. digestive system. D. alveolus.
Physics
2 answers:
Marina86 [1]3 years ago
7 0

Answer:

The answer is B. Lungs

Aleonysh [2.5K]3 years ago
7 0

Answer: B

Explanation: we use lungs to breathe, so we take oxygen by lungs.  

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Calculate the potential difference across a 25- resistor if a 0.3-A current is flowing through it.
alekssr [168]

Voltage = (current) x (resistance)

Voltage = (0.3 A) x (25 ohms)

Voltage = (0.3 x 25) (A-Ω)

<em>Voltage = 7.5 volts</em>

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3 years ago
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3. How long will it take a ball to reach the ground if it falls from a cliff 25 m tall (starting from rest)? What if the ball we
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Answer:

2.26 s

Explanation:

Let's take down to be positive.

Given (in the y direction):

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If the ball instead had an initial horizontal velocity of 5 m/s, its initial vertical velocity is still 0 m/s.  So the time to fall is still 2.26 s.

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5. You head downstream on a river in an outboard.
Elena-2011 [213]

Answer:

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3 years ago
Water vapor enters the atmosphere through
Blizzard [7]

Answer:

Heat from the Sun causes water to evaporate from the surface of lakes and oceans. This turns the liquid water into water vapor in the atmosphere. Plants, too, help water get into the atmosphere through a process called transpiration! ... Water can also get into the atmosphere from snow and ice.

Most water vapor enters the atmosphere via evaporation and transpiration. Evaporation occurs when a single water molecule on a liquid water surface gains enough kinetic energy (often by solar radiation) to break the bond which holds the molecules together. Really Hopes this helps!

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On which date is the gravitational force between Earth and the moon the greatest?
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The gravitational forces between the Earth and Moon are greatest when the two bodies are closest together. That happens every 27.32 days, when the Moon is at the perigee of its orbit.

Even if this happened at the same time in every orbit, the date would change, because there are not 27.32 days in a month.

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