Questions: Does the mass of a rocket affect the distance it can travel? Does sugar or salt have a greater effect on plant growth?

The answer is the second one: Does the mass of a rocket affect the distance it can travel?

Explanation for each option:

1. Why do people like to watch television?

   • This question is subjective and involves human preferences, which can vary widely. It is difficult to create a controlled, reproducible experiment to answer this question because it involves psychological and sociological factors that are not easily quantifiable or consistent across different populations.

2. Does the mass of a rocket affect the distance it can travel?

   • This question is objective and can be tested through controlled experiments. Scientists can create rockets of different masses and measure the distance each one travels under the same conditions. The results can be repeated and verified by other scientists, making it a good example of a scientific question that can lead to an easily reproducible experiment.

3. What makes the sky blue?

   • While this is a scientific question, it is more about understanding a natural phenomenon rather than conducting an experiment. The explanation involves the scattering of light by the atmosphere, which is a well-established scientific fact. It does not lend itself to a simple, reproducible experiment in the same way as the rocket mass question.

4. Does sugar or salt have a greater effect on plant growth?

   • This is also a good scientific question that can be tested through controlled experiments. Scientists can grow plants with different concentrations of sugar and salt and measure their growth. However, the results can be influenced by various factors such as plant species, soil type, and environmental conditions, which might make it slightly less straightforward to reproduce compared to the rocket mass experiment.

Summary: The question "Does the mass of a rocket affect the distance it can travel?" is the best example of a scientific question that could be used to create an easily reproducible experiment. It involves clear, measurable variables and can be tested under controlled conditions, allowing for consistent replication by multiple scientists.