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Physics 125A Lecture 26: Lecture 26

United States

Solar System Astronomy

Physics

Duvvuri

Washington University in St. Louis

General  Chemistry I

Organic Chemistry I With Lab

Organic Chemistry III

General Biochemistry I

Calculus II

Calculus III

General Physics I

Introduction to Ecology

Principles of Biology I

General Chemistry  Laboratory  I

General Chemistry II

Computer Science I

Physics I

General Physics II

Topics in Ancient Studies: Science and Medicine in Ancient Greece and Rome

Introduction to Archaeology

Ancient History: The Roman Republic

<p>After falling from rest from a height of <span style="color:#dd0000;">28</span> m, a <span style="color:#dd0000;">0.45</span> kg ball rebounds upward, reaching aheight of <span style="color:#dd0000;">18</span> m. If the contactbetween ball and ground lasted <span style="color:#dd0000;">2.2</span> ms, what average force was exerted onthe ball?</p>

<p>A spring gun (k = 28 N/m) is used to shoot a 56-g ballhorizontally. Initially<br>the spring is compressed by 18 cm. The ball loses contact with thespring and leaves the gun when the<br>spring is still compressed by 12 cm. What is the speed of the ballwhen it hits the ground, 1.4 m<br>below the spring gun?</p>

<table border="0" cellspacing="0" cellpadding="0" width="100%"><tbody><tr valign="top"> <td valign="top" nowrap align="right"> </td> <td width="100%"><div>An object is placed 11 cm in front of a concave mirrorwhosefocal length is 18 cm. The object is 3.0 cm tall. Using araydiagram drawn to scale, measure (a) the location and (b) theheightof the image. The mirror must be drawn to scale</div></td> </tr></tbody></table> <div>I know the answers are:</div> <div>a) 28 cm behind the mirror</div> <div>b) 7.6 tall</div>

Physics 125A Lecture 26: Lecture 26

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