What do you think would be the reason behind hot air balloon to rise up

1 answer:

4 0

The high temperature of the heated air inside the balloon causes the air particles to spread out. This leads to a lower density compared to colder air surrounding the balloon.

Therefore the low density causes the balloon to rise up.

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The noble gases have eight valence electrons and as a result are

AURORKA [14]

The noble gases have eight valence electrons and as a result are stable.

If an atom consists of 8 valence electrons, they have a full octet, and do not need to bond, which makes them "happy".

4 0

4 years ago

I need help on this question.

stira [4]

Answer:

<em>Answer: B. 49 N</em>

Explanation:

<u>Friction Force </u>

When an object is at rest on a rough surface, it encounters a friction force that opposes motion.

The friction force when an object is moving on a horizontal surface is calculated by:

$Fr=\mu_k N$

Where $\mu_k$ is the coefficient of static friction and N is the normal force.

If no forces other then the weight and the normal are acting upon the y-direction, then the weight and the normal are equal in magnitude:

N = W = m.g

Thus, the friction force is:

$Fr=\mu_k W$

We are given the coefficient of static friction $\mu_k=0.5$ and the mass of the object m=10 Kg. The minimum force needed to make it start moving is the maximum friction force: