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Zinaida [17]
3 years ago
5

When the air under the envelope is heated, the balloon lifts. Which of the following statements is true? A) hot air balloons use

radiation to rise B) hot air balloons use conduction to rise C) hot air balloons use convection to rise D) hot air balloons use air resistance to rise
Physics
2 answers:
Bond [772]3 years ago
4 0

The hot air balloon uses convection to rise

butalik [34]3 years ago
3 0

C) hot air balloons use convection to rise

when air under the envelope is heated, it  travels upward and it is less dense as compared to the air in the surrounding . This difference in density values of air inside and outside creates force of buoyancy which make the balloon to get lifted. since here the air is being heated and it is transporting the thermal energy with it, this process is called convection. hence we say that hot air balloons use convection to rise.

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Answer:

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Explanation:

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There is a(n) __________ relationship between an object's weight and its mass.
Mkey [24]
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3 years ago
A motorcycle starts from rest and has a constant acceleration. In a time interval t, it undergoes a displacement x and attains a
iren [92.7K]

Answer:

√(6ax)

Explanation:

Hi!

The question states that during a time t the motorcyle underwent a displacement x at constant acceleration a starting from rest, mathematically we can express it as:

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Then the we need to find the time t' for which the displacement is 3x

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Have a nice day!

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