PHYS 1101W Lecture 4: Week 4

On September 26 2011, The constellation Orion will rise at12:00AM

One Month later...

On August 26 2011, The Constellation Orino will rise at2:00AM

Think for a moment about why constellations rise at different timesduring different parts of the year and then explain why the time ofOrion's rising has changed by this amount we have found??

The target material of an x-ray tube is an alloy with atomicnumbers Z=26 and 27. The electron beam is accelerated by a 11 kVpotential difference. The smallest wavelength of the continuousx-ray spectrum produced is closest to??

A. 95 pm
B. 110 pm
C. 130 pm
D. 170 pm
E. 150 pm

Anwer is 110 pm

(Need to know how to show work)

Consider Figure 4-20 of the text (finger pushin on two blocks,m1 & m2). m1 = 26 kg and m2 = 17 kg. If the acceleration ofthis system is 2, what is the net force on m2? (answer inNewtons)