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ozzi
3 years ago
14

What is an example of Convection?

Physics
1 answer:
yKpoI14uk [10]3 years ago
3 0
Boiling water. <span>heat goes from the burner into the pot which heats the water at the bottom. this hot water rises and cooler water moves down to replace it, causing a circular motion.</span>
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A blue supergiant star has surface temperature 27 kK and has total power output 100000 times that of the Sun.
Free_Kalibri [48]

Answer:

Wien peak ( λmax ) is 107.40 nm

radius of super giant is 1.086 ×10^{10} m

Explanation:

given data

temperature 27 kK

power = 100000 times of Sun

Sun radius =  6.96 × 10^8 m

to find out

Wien peak ( λmax ) and radius of supergiant (r)

solution

we will apply here first wien law to find Wien peak  that is

λmax = b / t

λmax = 2.9 × 10^{-3} / 27000 = 1.0740 × 10^{-7}

so Wien peak ( λmax ) is 107.40 nm

and

now we apply steafay law that is

P = σ × A × T^{4}   .........................1

and we know total power output 100000 time of Sun

so we say  

4πr²sT^{4}  = 100000 × 4πR²sTs^{4}

r² = 100000  × R²Ts^{4} / T^{4}

put here value

r² = 100000  × (6.96×6000^{8} )² × 6000^{4} / 27000^{4}

r² = 1.18132 ×10^{20}

r = 1.086 ×10^{10} m

so radius of super giant is 1.086 ×10^{10} m

3 0
4 years ago
The initial speed of a body is 3.28 m/s. What is its speed after 2.32 s if it accelerates
Helga [31]
Final velocity = initial velocity + acceleration * time

v = u + at

v = 3.28 + 2.32 * 2.08

v = 3.28 + 4.83

<u>v = 8.11 m/s</u>
6 0
3 years ago
Help please physics!!!
Hitman42 [59]

Answer:

I think c is the answer.....

6 0
3 years ago
Read 2 more answers
A car collides head on with a stationary sign. The collision brings the car to a stop, but the sign does not move.
olga_2 [115]

A.a sign that breaks loose from the ground when a force is applied to it

7 0
3 years ago
A plane travels 395,000 meters in 9,000 seconds. What was its speed?
sladkih [1.3K]

When a plane travels 395,000 meters in 9,000 seconds its speed is 395,000 ÷ 9000 = 43.888888 (the 8 repeats) meters per second.

8 0
3 years ago
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