PHYS 325 Lecture 8: Lecture 8

<p>A baseball leaves a pitcher's hand horizontally at a speedof 161 km/hr. The distance to the batter is 18.3m. a. how long doesthe ball take to travel the first half of thatdistance?</p>
<p>b. the second half?</p>
<p>c. how far does the ball fall freely during the firsthalf?</p>
<p>d. during the second half?</p>
<p>e. why aren't the quantities in &lt;c&gt; and&lt;d&gt; equal?</p>

<p>A 5.0-kg crate is on an incline that makes an angle 30degrees with the horizontal. If the coefficent of static frictionis 0.5, the maximum force that can be applied parallel to the planewithout moving the crate is:</p>
<p>A) 0</p>
<p>B) 3.3 N</p>
<p>C) 30 N</p>
<p>D) 46 N</p>
<p>E) 55 N</p>

An ideal gas confined in a box initially has pressure p. If theabsolute temperature of the gas is doubled and the volume of thebox is quadrupled, the pressure is

a) p/8 b) p/4 c) p/2 d) p e) 2p

explain