The Arecibo Observatory sent a powerful radio signal to space in 1974. Assume there is an alien civilization located on a planet around Alpha Centauri (distance 4.2 light-years from Earth) and they detect this transmission. They immediately send an invasion force that travels at 10% of the speed of light. What year ON EARTH will the alien invasion force arrive

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

What equation is used to calculate the weight of an object on a plant ?

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.)