Let Y = ln(X), where Y follows a normal distribution with mean µ and variance σ
2
. Calculate E(X) and V (X). (hint: if Z follows a normal
distribution with mean µ and variance σ
2
, then MZ(t) = e
µt+ 1
2
σ
2
t
2
)

What precautions should you take to prevent injuries when dealing with heavy loads?

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?