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Answer:
8.4 kW
Explanation:
Using the Stefan-Boltzmann law,
P = εAσT4
Where:
P: Radiation Energy
ε: Emissivity of the Surface. Check emissivity table below of common materials.
A: Surface Area, in m^2.
σ: Stefan-Boltzmann Constant, σ=5.67 × 10-8 W/m2•K4
T: Temperature
Plugging in values,
P = 0.85 x 3.328 x 5.67 x 10^(-8) x 205
P = 8383 W or 8.4 kW
1) The coefficient of friction of the surface
2) The weight of that objects
Force can be calculated by the product of mass and the acceleration of the object in motion. Acceleration is the change of velocity per change in time. The expression would be:
F = ma
where
a = Δv/Δt
The object is from rest and time 0. Acceleration would reduce to:
a = v/t
F = m(v/t)
2000 = 100 (v / 0.3)
v = 6 m/s -------> OPTION 1
