During a manned mission to mars, astronaut mark watney is presumed dead after a fierce storm and left behind by his crew. but watney has survived and finds himself stranded and alone on the hostile planet. with only meager supplies, he must draw upon his ingenuity, wit and spirit to subsist and find a way to signal to earth that he is alive. if mark watney uses am waves (λ approximately 102 meters) to try and contact nasa, how long, in minutes, will it take for his message to reach earth from mars?

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

0.88m hope i am correct : )