(a) calculate the heat flux (in w/m2) through a sheet of a metal 12 mm thick if the temperatures at the two faces are 310 and 130 ˚c. assume steady-state heat flow and that the thermal conductivity of this metal is 51.1 w/m·k.(b) what is the heat loss per hour if the area of the sheet is 0.28 m2? (c) what will be the heat loss per hour if a material with a thermal conductivity of 1.1 w/m·k is used? (d) calculate the heat loss per hour if the first metal is used and the thickness is increased to 21 mm.(a) /m2( j/h(c) /h( j/h

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79

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

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