Research and discuss the aurora borealis in
terms of electric charges, magnetic fields, and
forces. Which times of the year are best for seeing the northern lights, and where are the best
places to view them? Explain your answers. Also
identify links to good images. If you've ever seen the aurora borealis, describe your experience and note the time and place that you saw it.

After the near spacecraft passed mathilde, on several occasions rocket propellant was expelled to adjust the spacecraft's momentum in order to follow a path that would approach the asteroid eros, the final destination for the mission. after getting close to eros, further small adjustments made the momentum just right to give a circular orbit of radius 45 km (45 × 10^3 m) around the asteroid. so much propellant had been used that the final mass of the spacecraft while in circular orbit around eros was only 545 kg. the spacecraft took 1.04 days to make one complete circular orbit around eros. calculate what the mass of eros must be.

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

Asap and show ! a 14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.