Sam walks to his neighborhood park to play on the swing set. He sits on a swing that is 0.60 meters above the ground and begins swinging. Sam weighs 38 kilograms and is moving at 2.8 meters per second at the bottom of each swing. How much kinetic energy does Sam have at the bottom of each swing? Assume that acceleration due to gravity is 10 m/s2. A. 149 joules B. 228 joules C. 298 joules D. 53 joules

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

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What is the most common structure of volcanoes?