A certain polymer needs to be heated by a heat lamp for at least 50 seconds to cure properly at 500 C at l atm pressure. The optimum height of the heat lamp above the parts is 65 cm. The heat lamp has an effective range within a circular cone 23" from the vertical.

a) If the conveyor belt is moving at 8.5 m /min (meters per minute). how many heat lamps must be placed in succession above the pans to cure properly?

b) If only four heat lamps arc used. what should the speed of the belt be in m/min?

Note: Express the Part (b) answer to one decimal place. (Ignore significant figures for now.)

Lamp H-65 cm Conveyor Belt 1