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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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An 8 kg mass moving at 8 m/s collides with a 6 kg mass
steposvetlana [31]

Answer:

10 m/s

Explanation:

Momentum before collision = momentum after collision

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

(8 kg)(8 m/s) + (6 kg)(6 m/s) = (8 kg)(5 m/s) + (6 kg) v

64 kg m/s + 36 kg m/s = 40 kg m/s + (6 kg) v

60 kg m/s = (6 kg) v

v = 10 m/s

3 0
3 years ago
While John is traveling along an interstate highway, he notices a 150 mi marker as he passes through town. Later John passes a 1
Lerok [7]

Answer:

Part a)

distance = 112 miles

Part b)

current position = 112 miles from the position of town

Explanation:

Part a)

Since the distance marker is showing the distance between the town and the position of john at all time

so here we have

d = 112 miles

Part b)

Current position of John is given as

r = 112 miles

from the position of the town

7 0
3 years ago
Read 2 more answers
Select the correct answer.
Dahasolnce [82]

Answer:

a is the correct choice

Explanation:

5 0
2 years ago
Read 2 more answers
If you were on a decision making board with the task of choosing which innovation to fund, what criteria would you use to make y
faust18 [17]

Explanation:

The criteria for decision making would be

1. I would fund for the school of young diabetics, for the sole purpose of them leaning and being motivated for a healthy lifestyle.

2. I would also fund for new and improved insulin pumps as old ones cause multiple problems.

3 0
3 years ago
When a neutrally charged atom loses an electron to another atom, the result is the creation of
Ostrovityanka [42]
That would make a cation. If it gained one instead, then it would make an anion.
5 0
2 years ago
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