Short-wavelength uv is sometimes called vacuum uv, because it is strongly absorbed by air and must be studied in a vacuum. calculate the photon energy in ev for 100-nm vacuum uv, and estimate the number of molecules it could ionize or break apart.

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.

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration