One End of a 1

question 31

Multiple Choice

One end of a 1.0-m string is fixed; the other end is attached to a 2.0-kg stone.The stone swings in a vertical circle, passing the top point at 4.0 m/s.The tension force of the string at this point is about:

• A)0 N
• B)12 N
• C)20 N
• D)32 N
• E)52 N

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Definitions:

Independent Variables

Independent variables are the variables in an experiment that are manipulated or changed to observe their effect on dependent variables.

Placebo Effects

The phenomenon in which patients experience real improvements in their health or symptoms due to their belief in the efficacy of a treatment that has no therapeutic value.

Experimenter Bias

A form of cognitive bias that can affect the outcome of research, originating from the researcher's expectations, attitudes, or behaviors influencing the subjects or results.

Research Design

The overall strategy and structure of an investigation aiming to answer research questions by outlining procedures for collecting, analyzing, and interpreting data.