Acylinder 8 in in diameter and 3 ft long is concentric with a pipe of 8.25 in internal diameter. between the cylinder and the pipe there is an oil film. what force is required to move the cylinder along the pipe at a constant velocity of 3 ft/s? the kinematic viscosity of the oil is 0.006 ft2 /s; the sg is 0.92

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.)