How much energy is used for boiling water in a 4 KW kettle for 20 minutes.​

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.)

What is the speed vfinal of the electron when it is 10.0 cm from charge 1?

What does every magnet possess? a. iron metal b. strong magnetic field c. repulsion d. north and south poles