El hidrógeno pesa el 6.9 % del peso del aire qué cantidad de hidrógeno hay en un globo de 150 metros cúbicos de capacidad y el decímetro cúbico de aire pesa 1.3 gramos?

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

Where do magnetic lines of force enter earth?

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.)