A d. c. motor has the following spec: k×flux= 6.0v. s Vt= 10:0 V Ra= 1.5:00 Ia= 4:0 A (armature current at full load). Calc rated torque, starting torque; starting current at full voltage, starting speed; For Seperately excited and Shunt motor?

The temperature in gavin's oven is a sinusoidal function of time. gavin sets his oven so that it has a maximum temperature of 280°f and a minimum temperature of 240°. once the temperature hits 280°, it takes 20 minutes before it is 280° again. gavin's cake needs to be in the oven for 30 minutes at temperatures at or above 270°. he puts the cake into the oven when it is at 260° and rising. how long will gavin need to leave the cake in the oven? (round your answer to the nearest minute.)