Hy Marx takes her pocket calculator out of her book bag as she gets ready to do her physics homework. In the calculator, a 0.160 C charge encounters 19.0 Q of resistance every 2.00 seconds. What is the potential difference (voltage) of the battery?

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.)