* ^ be is tired. also via a light tiring, to Week 7 Challenge Homework Solutions You are a world-famous physicist-lawyer defending a client who has been charged with murder. It is alleged that your AP = 8 client, Mr. Lawton, shot the victim, Mr. Cray. The detective who investigated the scene of the crime, Mr. Dibay. found a second bullet, from a shot that missed Mr. Cray, that had embedded itself into a chair. You arise to cross- examine the detective. 2 Pix = EPEx You: In what type of chair did you find the bullet? Dibny: A wooden chair. How massive Pair . Peis = Prax Dibny: It had a mass of 20 kg : How did the chair respond to being struck with a bullet? Dibny: It slid across the floor. You: How far Dibny: Three centimeters. The slide marks on the dusty floor are quite distinct. Vres Ms : What kind of floor was it? y: A wood floor. You: What was the mass of the bullet you retrieved from the chair STAGE I + II Dibny: Its mass was 10 g. You: Have you tested the gun you found in Mr. Lawton's possession? Dibny: I have. You: What is the muzzle velocity of bullets fired from that gun? System ( HATE - DOUG ) Dibny: The muzzle velocity is 450 m/s. With only slight hesitation, you turn confidently to the jury and proclaim, "My client's gun did not fire those shots!" IV - (a) (a) How are you going to convince the jury and judge? (b) (b) Choose one part of your solution and perform a sense-making analysis. Clearly state which sense-making analysis you've chosen and why. FEW DIFFERENT WAYS TO PROVE .... KNOWS UK ". . ONE why IS TO FIND INITIAL VELALED OF A BULLET SUCH THAT THE CHASE THEM Mcum = Mc = 20 kg ... . MarkS 3 CA .... THEN COMPME my GIVEs 4 50 ry THIS Can BE DONE IN 2 STARES ... Aremul Ed = 0.03 M -.. 3 STAGES EFX = Man MALLET = MB = 0.010 kg -F" = Max I C.O.M. - AL FU - Max CHAIR IS PE : wood I / FORCES FLOUR TYPE : Wood 5 MK = 0. 20 - he my = mae GOOGLE TILL KINEMATICS V . = 450 ms COMMON WOOD ON WO . STAGE I FINAL INITIAL Visa = ( Mo am. ) $ 2 Ang box SYSTEM CHAIR + BULLET MB VisNic = 0 |: VFCB Viox = |2 Mugax ( me + me ) " 1687 mys COMPONE 601 mrs ) 4 BUT AT * 0 So AP = 0 SO NOT THE