Please Note: It may not always be possible to include the necessary special characters, superscripts, subscripts, etc. in e-mail responses to this group of exercises. We suggest that you discuss this matter with your professor/class and decide upon a system for indicating such characters. You may cut/paste some characters and/or Greek letters from Microsoft Word, using the Insert menu. Alternatively, we suggest that you agree upon abbreviations for or spell out symbols, Greek letters, or characters and indicate superscripts and subscripts by using "sup", "sub", or up/down carats.

1			Explain the difference between speed and velocity.
2			If a feather and a lead brick are dropped simultaneously from the top of a ladder, the lead brick hits the ground first. What would happen if the experiment is repeated on the surface of the Moon?
3			What force(s) act on a parachutist descending to Earth with a constant velocity? What is the acceleration of the parachutist?
4			What is the acceleration of an object thrown straight up into the air at the highest point of its motion? Does the answer depend on whether air resistance is negligible or not? Explain.
5			An object is moving along a straight line. The graph in Fig. 3.33 shows its position from the starting point as a function of time. (a) In which section(s) of the graph does the object have the highest speed? (b) At which time(s) does the object reverse its direction of motion? (c) How far does the object move from t = 0 to t = 3 s? <a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::Fig. 3.33::/sites/dl/free/0070524076/57986/fig_033.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif">Fig. 3.33 (6.0K)</a>Fig. 3.33
6			If a car traveling at 28 m/s is brought to a full stop in 4.0 s after the brakes are applied, find the average acceleration during braking.
7			A man lifts a 2.0-kg stone vertically with his hand at a constant velocity of 1.5 m/s. What is the force exerted by his hand on the stone?
8			A train, traveling at a constant speed of 22 m/s, comes to an incline with a constant slope. While going up the incline, the train slows down with a constant acceleration of magnitude 1.4 m/s2. What is the speed of the train after 8.0 s on the incline?