A Person Is Dragging a Packing Crate of Mass 100

question 30

Multiple Choice

A person is dragging a packing crate of mass 100 kg across a rough horizontal floor where the coefficient of kinetic friction is 0.400.He exerts a force F sufficient to accelerate the crate forward.At what angle above horizontal should his pulling force be directed in order to achieve the maximum acceleration?

• A) 21.8°
• B) 27.7°
• C) 30°
• D) 34.5°
• E) 45°

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Definitions:

Sarcomere

The fundamental unit of striated muscle tissue, responsible for muscle contraction, defined by the area between two Z lines.

Contracted Sarcomere

A sarcomere that has shortened in length, due to the sliding of actin and myosin filaments, leading to muscle contraction.

Muscle Fiber

A single muscle cell that contracts in response to stimulation and is capable of producing force.

Electrically Excitable Cells

Cells capable of generating and propagating electrical impulses, such as neurons and muscle cells.