What is an advantage of a nuclear reactor over a power plant that uses fossil fuels?
A. Nuclear reactors do not produce any hazardous waste product.
B. The fuel for nuclear reactors can be used without any processing.
C. Nuclear reactors do not produce greenhouse gases.
D. A nuclear reactor is much more economical to build.

Rosa records the distance that a toy car rolls and the time it takes to cover the distance. what scientific practice is this? collecting data asking a question providing explanations communicating results

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.

Name three different units of energy used to measure heat and describe what type of situations each is usually used.