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KINE 2P91 Lecture 3: Adapted Physical Activity-LECTURE 3.docx

Canada

Social History of Physical Education and Sport

Physical Education and Kinesiology

Cathy Van Ingen

Brock University

<p>In many parts of the world, bicycles are adapted as sources of mechanical energy. For example, two men in Malawi were able to lift, by pedaling, 4300 liters of water per hour through a rise of 9 m. What power did each man develope?</p>

<p>The night-adapted eye can detect as few as several photons per second- say five to be definite. Assuming that the pupil of the eye is 0.6 cm in diameter, from what distance would it be possible for the naked eye to detect the 60-W lightbulb of Example 4-1?</p>

<div>The human eye can barely detect a star whose intensity at the earth's surface is 1.6×10−11W/m2.  </div>
<div>If the dark-adapted eye has a pupil diameter of 6.7 mm, how many photons per second enter the eye from the star? Assume the starlight has a wavelength of 550 nm.</div>

KINE 2P91 Lecture 3: Adapted Physical Activity-LECTURE 3.docx

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