Q: Q: Gases such as co2 and methane can trap what energy in earth's atmosphere, before radiating it into space? A:

OPTIONS:
- mechanical energy
- sunlight energy
- potential energy
- thermal energy

A: thermal energy

input: OPTIONS:
- ending
- middle
- concurrent
- beginning Now, answer this question: Q: Reactant concentrations are highest at which part of a reaction? A:
A:
output: beginning

Q: Friction does negative work and removes some of the energy the person expends and converts it to which kind of energy? A:

OPTIONS:
- erosion
- hydro
- evaporation
- thermal

Answer: thermal

Problem: OPTIONS:
- temperature
- pressure
- wavelength
- direction
Q: Q: Acceleration is a vector, and thus has a both a magnitude and what else? A:
Answer: direction

Problem:OPTIONS:
- mature
- immature
- stable
- unstable

Q: Radioisotopes may vary greatly in their rate of decay, decaying faster if their nuclei are more what? A:
****
A: unstable

Problem:OPTIONS:
- reflective point
- boundary point
- periodic point
- focal point

Q: The point in front of a mirror where the reflected rays intersect is known as what? A:
****
A:
focal point