Answer: 3.7×10¹²watts
Explanation:
Radiation is one of the mode of heat transfer and modes differs from each other based on their medium of heat transfer. Radiation is a process of transferring heat energy from one point to another without heating the intervening medium (no material medium is required).
According to Stefan's law of radiation, the rate of emission of radiant energy is directly proportional to the fourth power of its absolute temperature.
Mathematically, R = eAT⁴
e is constant of proportionality called emissivity. Emissivity varies depending on the type of body being considered.
For the question, we are considering black body and emissivity of black body is 1 being a perfect body.
A is the area of the body
T is the absolute temperature
e = 1
A = 0.5cm²
T = 1650°C
Rate of radiation = 1×0.5×1650⁴
= 3.7×10¹²watts.
The hole will therefore radiate 3.7×10¹²watts
Answer:
Explanation:
Given
Work required to stretch 1 ft is 12 ft-lb
and we have to find work required to stretch 3 in.
i.e. 
divide (1)&(2)
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Answer:
24 m/s
Explanation:
V=Vi+at
given initial velocity is 0, acceleration is 2 and time is 12 sec
find final velocity by plugging in the variables into the equation above.
V=0+2x12=24m/s
Force(F) = mass(m) * acceleration (a)
Here, F = 2500 N
a = 200 m/s²
Substitute their values into the expression,
2500 = m * 200
m = 2500 / 200
m = 25/2
m = 12.5 Kg
In short, Your Answer would be Option B
Hope this helps!
