12/6 There was an error in the original version of the Test 5 Key that was placed at the Noble Copy Center. That version was replaced today. If you have the original version, the error is in MC #6; the correct answer is 0.8 s. If you get your test back from you TA today, you should double-check that #6 has been graded correctly. Thanks and sorry for the error. GBA 12/4 The Test 2-5 Keys are now available at the Noble Library Copy Center. GBA 9/22 The Test 1 Key is now available at the Noble Library Copy Center. GBA 9/06 The Old Tests are now available at the Noble Library Copy Center. GBA 9/06 Several students asked about the "flowerpot" problem. Here's my solution. Divide window height by delta t (time to pass) giving the average speed while passing. This is also the instantaneous speed at the middle of the interval timewise. Therefore, multiply half the delta t times g and subtract this from the average speed, giving the speed at the top of the window. Once you know the speed at the top of the window the rest is easy. There are several other solutions. For example, if you like to do algebra, you can write the position equation for the instant when the top of the window is passed (this equation will have two unknowns), repeat for the instant that the bottom of the window is passed (same two unknowns), and solve the system of equations. GBA 9/05 There was another temporary email disruption on 9/05. Some emails may have been lost. If you sent an email on 9/05 and did not receive a reply, please send again. Thanks. GBA 9/01 My email disruption has now ended (5 PM Fri 9/01). If you sent an email on Thur 8/31 or before Fri 9/01, and did not get a reply, you might want to resend the email. Thanks for your patience. GBA 8/31 My main email address is connected to a computer in the basement of Goldwater. There is some problem over there today (turned out to be an electrical fire), so my email is temporarily not working. If the Goldwater problem is not solved soon, I will switch to an alternate email address. Thanks for your patience. GBA 8/19 No updates yet.