A Uniform Beam Having a Mass of 60 Kg and a Length

question 3

Multiple Choice

A uniform beam having a mass of 60 kg and a length of 2.8 m is held in place at its lower end by a pin. Its upper end leans against a vertical frictionless wall as shown in the figure. What is the magnitude of the force the pin exerts on the beam?

• A)0.68 kN
• B)0.57 kN
• C)0.74 kN
• D)0.63 kN
• E)0.35 kN

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Definitions:

Theory of Natural Selection

A foundational principle of evolutionary biology proposing that organisms better adapted to their environment tend to survive and produce more offspring.

Evolutionary Scenario

A theoretical framework used to describe and analyze the evolutionary processes that give rise to specific traits or behaviors.

Behavioral Trait

A characteristic way of behaving that is often significant to the survival or reproductive success of an organism.

Proximate Explanations

Explanations in biology that address the immediate cause or mechanism of a behavior or trait, as opposed to its evolutionary or historical origin.