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Anna35 [415]
3 years ago
10

Which of the following cools the air in a household refrigerator?

Physics
1 answer:
belka [17]3 years ago
7 0
<span>The answer is A since refrigeration occurs when the normal room temperature heat is drawn away from the inside of the unit through the evaporation of a liquid. Through the process of entropy then, the air instantly cools to the right temperature to preserve food.</span>
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Which of these forces pull or push upward, and which pull or push downward? Explain.
PtichkaEL [24]

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A force is a push or pull that acts upon an object as a result of that objects interactions

Explanation:

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3 years ago
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mr Goodwill [35]

Answer:

Yes

Explanation:

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008 (part 3 of 4) 3.0 points
motikmotik

Car A take a time of 2.55hr and car B take a time of 2.14 hr

We know that distance divide by time is speed

here it is given that car A to reach a gas station a distance 189 km from the school traveling at a speed of 74 km/hr​

so speed=distance/time

s=d/t

t=d/s

=189/74

=2.55hr

In case of car B it is given that The distance from the is 199.8km, car b is traveling at a speed of 93 km/hr  

s=d/t

t=d/s

=199.8/93

=2.14hr  

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5 0
1 year ago
A polar bear runs at a speed of 11 m/s and has a mass of 380.2 kg. How much Kinetic energy does the bear have?
Yanka [14]

Answer:

\boxed{\sf Kinetic \ energy \ of \ the \ bear (KE) = 23002.1 \ J}

Given:

Mass of the polar bear (m) = 6.8 kg

Speed of the polar bear (v) = 5.0 m/s

To Find:

Kinetic energy of the polar bear (KE)

Explanation:

Formula:

\boxed{ \bold{\sf KE =  \frac{1}{2} m {v}^{2} }}

Substituting values of m & v in the equation:

\sf \implies KE =  \frac{1}{2}  \times 380.2 \times  {11}^{2}

\sf \implies KE = \frac{1}{ \cancel{2}}  \times  \cancel{2} \times 190.1 \times 121

\sf \implies KE = 190.1 \times 121

\sf \implies KE = 23002.1 \: J

\therefore

Kinetic energy of the polar bear (KE) = 23002.1 J

5 0
3 years ago
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