Answer:
T = 3.6 10³ K
Explanation:
A good way to calculate the surface temperature of a star is to approximate it as a black body, and use Wien's displacement law.
λ T = 2,898 10⁻³
In this case they tell us that the light from the star is between red (700nm) and light infrared (2500nm) suppose that the radiation is
λ = 800 nm (near infrared)
T = 2,898 10⁻³ /λ
T = 2,898 10⁻³/ (800 10⁻⁹)
T = 3.6 10³ K
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Answer:
Time, t = 2.76 seconds
Explanation:
It is given that,
Mass of the bucket, m = 5.2 kg
The breaking strength of the cord, T = 70 N
Initially, the bucket is at rest, u = 0
Bucket is to raise a distance of 14 meters, d = 14 m
At equilibrium, the net force acting on the bucket is given by :
When the bucket is moving in upward direction,
a is the acceleration of the bucket.
Let t is the minimum time required to raise the bucket a vertical distance of 14.0 m without breaking the cord. Using second equation of motion as :
t = 2.76 seconds
So, the minimum time required to raise the bucket a vertical distance is 2.76 seconds. hence, this is the required solution.
Conductors should be the answer. Most conductors are metals.