Atank is filled with 1000 liters of pure water. brine containing 0.07 kg of salt per liter enters the tank at 7 liters per minute. another brine solution containing 0.03 kg of salt per liter enters the tank at 10 liters per minute. the contents of the tank are kept thoroughly mixed and the drains from the tank at 17 liters per minute.

a. determine the differential equation which describes this system. let s(t)denote the number of kg of salt in the tank after t minutes. then

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.

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?