Athin, square metal plate measures 15 cm on each side and has emissivity of 0.80. the plate is heated to a temperature of 605°c. what is the rate at which the plate radiates energy ? the stefan-boltzmann constant is 5.67 × 10-8 w/(m2 ∙ k4). remember that the plate will radiate energy from both its top and bottom surfaces.

1213 Watt

Explanation:

A = 15 x 15 = 225 cm^2 = 0.0225 m^2

e = 0.80

T = 605 C = 605 + 273 = 878 K

σ = 5.67 x 10^-8 W / (m2 . K^4)

Energy per unit time = σ A e T^4

Energy per unit time = 5.67 x 10^-8 x 0.80 x 0.0225 x (878)^4

Energy per unit time = 606.5 Watt

Rate of energy radiated from both the surfaces = 2 x 606.5 = 1213 Watt

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.

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explanation: