A Plane Flying at 70

question 24

Multiple Choice

A plane flying at 70.0 m/s suddenly stalls.If the acceleration during the stall is directly downward,the stall lasts 5.0 s,and the plane was originally climbing at 25° to the horizontal,what is the velocity after the stall?

• A) 66 m/s at 17° below the horizontal
• B) 66 m/s at 17° above the horizontal
• C) 80 m/s at 37° below the horizontal
• D) 80 m/s at 37° above the horizontal

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Definitions:

Transverse Tubules

These are extensions of the cell membrane that penetrate into the center of skeletal and cardiac muscle cells, facilitating the uniform contraction of the muscle.

Sarcolemma

The thin, plasma membrane that envelopes a muscle cell (fiber), playing a critical role in muscle contraction.

Z Lines

Positions within muscle fibers that mark the boundaries of sarcomeres, playing a critical role in muscle contraction by anchoring actin filaments.

I Bands

The light-appearing regions of a sarcomere in striated muscle fibers, primarily composed of thin actin filaments.