Answer the following question given this paragraph: Radiation is the transfer of thermal energy by waves that can travel through empty space. When the waves reach objects, they transfer thermal energy to the objects. This is how the sun's energy reaches and warms Earth. Q: What is the transfer of thermal energy by waves that can travel through empty space called? Choices: - convection - induction - vibration - radiation A:
radiation
Answer the following question given this paragraph: As the example implies, gravitational force is completely negligible on a small scale, where the interactions of individual charged particles are important. On a large scale, such as between the Earth and a person, the reverse is true. Most objects are nearly electrically neutral, and so attractive and repulsive Coulomb forces nearly cancel. Gravitational force on a large scale dominates interactions between large objects because it is always attractive, while Coulomb forces tend to cancel. Q: Gravitational force on a large scale dominates interactions between large objects because it is always what? Choices: - ugly - vulnerable - suitable - attractive A:
attractive
Q: Answer the following question given this paragraph: Water droplets form when the air reaches 100% humidity. If the temperature is cold enough, frost will form. Q: Water droplets form when the air reaches 100-percent what? Choices: - density - chance of rain - heat - humidity A:
A: humidity
Question: Answer the following question given this paragraph: enzymes - proteins which speed up chemical reactions. Q: Enzymes - proteins which speed up what? Choices: - crystals reactions - liquid reactions - physical reactions - chemical reactions A:
Answer: chemical reactions
*Question*
Answer the following question given this paragraph: Making Connections: Cosmology and Particle Physics There are many connections of cosmologyby definition involving physics on the largest scalewith particle physicsby definition physics on the smallest scale. Among these are the dominance of matter over antimatter, the nearly perfect uniformity of the cosmic microwave background, and the mere existence of galaxies. Matter versus antimatter We know from direct observation that antimatter is rare. The Earth and the solar system are nearly pure matter. Space probes and cosmic rays give direct evidencethe landing of the Viking probes on Mars would have been spectacular explosions of mutual annihilation energy if Mars were antimatter. We also know that most of the universe is dominated by matter. This is proven by the lack of annihilation radiation coming to us from space, particularly the relative absence of 0.511-MeV rays created by the mutual annihilation of electrons and positrons. It seemed possible that there could be entire solar systems or galaxies made of antimatter in perfect symmetry with our matter-dominated systems. But the interactions between stars and galaxies would sometimes bring matter and antimatter together in large amounts. The annihilation + radiation they would produce is simply not observed. Antimatter in nature is created in particle collisions and in decays, but only in small amounts that quickly annihilate, leaving almost pure matter surviving. Particle physics seems symmetric in matter and antimatter. Why isn't the cosmos? The answer is that particle physics is not quite perfectly symmetric in this regard. The decay of one of the neutral K -mesons, for example, preferentially creates more matter than antimatter. This is caused by a fundamental small asymmetry in the basic forces. This small asymmetry produced slightly. Q: The lack of annihilation radiation coming to us from space proves that the universe is dominated by what? Choices: - vacuum - energy - space - matter A:
**Answer**
matter
*Question*
Answer the following question given this paragraph: Every object is attracted to every other object by gravity. The force of gravity between two objects depends on the mass of the objects. It also depends on how far apart the objects are. When you are sitting next to your dog, there is a gravitational force between the two of you. That force is far too weak for you to notice. You can feel the force of gravity between you and Earth because Earth has a lot of mass. The force of gravity between the Sun and planets is also very large. This is because the Sun and the planets are very large objects. Gravity is great enough to hold the planets to the Sun even though the distances between them are enormous. Gravity also holds moons in orbit around planets. Q: Every object is attracted to every other object by what force? Choices: - weight - magnetism - pheromones - gravity A:
**Answer**
gravity