Consider a long plastic rod (rho=1000 kg/m3 Cp=1.040 kJkgK, k=0.3 W/m·K) of diameter 30 mm that is heated uniformly in an oven to Ti and then allowed to convectively cool in ambient air (T[infinity]=25°C, h=8 W/m2·K) for a four minute period. If the minimum temperature of rod cannot be less than 170°C, to what temperature should the rod be heated to? In addition, the maximum-minimum temperature difference within the rod should not exceed 10°C. Is this condition met? Please DO NOT interpolate, use closest values in tables if tables are used.

Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10

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?

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?