Brianna weighs 425 n. she climbs a flight of stairs to a height of 8 m. it takes her 6 seconds.
how much work does brianna do when she climbs the stairs?
a.
71 j
b.
2550 j
c.
3400 j
d.
53 j

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

The particles that are found in the nucleus of an atom are

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?