Alight source emits light with dominant wavelengths in the range of 650 to 690 nm. what is the principle color of light emitted by the source?

Which material produces static charge when rubbed?

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.

Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .