What is one disadvantage of using nuclear fission to produce electricity? O A. It produces only a small amount of energy.
B. It has a limited supply of fuel.
O c. It requires very high temperatures and pressures.
OD. It is difficult to store and dispose of radioactive wastes.
SUBMIT

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.

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.