Nio conducts a science experiment. he puts yeast into a bottle with water and sugar, and then caps the bottle with a balloon. he returns two hours later and notices there are bubbles on the surface of the mixture in the bottle and that the balloon has inflated, but there are no other apparent changes.
what most likely happened?
a: a non-chemical change, because there are no indicators of chemical changes taking place
b: a chemical change, because the mixture changed color
c: a chemical change, because a gas was produced
d: a non-chemical change, because the changes that occurred are reversible

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.

What is the mass of the same rock on the earth

Amodel rocket with a mass of 0.212 kg is launched into the air with an initial speed of 84 m/s. how much kinetic energy will the rocket have at a height of 214 m? assume there is no wind resistance. 634 j 303 j