Suppose there are 100,000 signaling societies in our galaxy. what is the average distance between civilizations, assuming that civilizations are spread evenly throughout the galactic disk? "

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Directions: count the number of atoms. ar co2 na3po4 so3 nac2h3o2

Aplayground slide is 8.80 ft long and makes an angle of 25.0° with the horizontal. a 63.0-kg child, initially at the top, slides all the way down to the bottom of the slide. (a) choosing the bottom of the slide as the reference configuration, what is the system's potential energy when the child is at the top and at the bottom of the slide? what is the change in potential energy as the child slides from the top to the bottom of the slide? (include the sign of the value in your answer.)