disc7 - Discussion Full Name(11 Angie Brad and Carlos are...

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Unformatted text preview: Discussion # Full Name: (11. Angie, Brad, and Carlos are discussing a physics problem in which two identical bullets are fired with equal speeds at equal-mass wood and steel blocks resting on a frictionless table. One bullet bounces off the steel block while the second becomes embedded in the wood block. All the masses and speeds are the same," says Angie, "so i think the blocks will have equal speeds after the collisions." "But what about momentum?" asks Brad. "The bullet hitting the wood block transfers all its momentum and energy to the block, so the wood block should end up going faster than the steel block." "i think the bounce is an important factor," replies Carlos. "The steel block will be faster because the bullet bounces off it and goes back the other direction." a) Which of these three do you agree with? Why? . Nomi/{mm us M be COW ’03 LS CONN/F Consemwm JXV 30% CW at «the woodbm boy, ball/I QM {YlOVlQiA Toes ‘ . ¢ ‘5 MGM . m mg «mm: “thott'iw/ MOWWYI Git-HA1; HOLQLQA ’ W% iP< O "13% VUOUmM m 'H/Ii) CM 100.3) -—/2 Ac évgtheW u etIs fthe block b) Assume he[the m mthe mass 0 the initial speed of’ the bullet' Is v0, the rebound peed of the bullet Is the half of its initial speed Kvo, determine the final speed of the steel block and wood block Which one is bigger? Represent your answers in the simplest possible form In terms of any or all of the following: m, M, v0, and any universal physical or mathematical constants. (Senna-rod W, + MVWu = my; +M\/m,§ Wocdl mvor \4e(m+M> 383d. WWI; =‘ZWNB ”i“ VKVIDWLX, bulid (5 web‘ , £0 1 w\\e«l and an Mimi have Semi/LL Wloug This EIMSZV V“? W\ + M c) Numbers might be more convincing than symbols! Give reasonable estimations for m, M, v0 to determine the final speed of the steel block and wood block. Which one is bigger? Discussion # Full Name: Q2. A ZOO-g ball is dropped from a height of 2.0 m, bounces on a hard floor, and Ft rebounds to a height of 1.5 m. The figure shows the impulse received from the floor. What maximum force does the floor exert on the ball? I= op: S? at KS7? OH: "S Ma LUGCKSM/ CIA/12% .— L1?may ( OOS>O l‘:::_w_+{ £0115) OF L g—QL = mnge- mv; W6 {Md Aim \JL and \‘JL AW ’0 W KIMWC’S‘ E) v~ x a?“ V ' “JR Viiaci V5? 3 if iv 2413 ‘i‘ 6 O: \Jg*1(w0\~%3d V325— 0+ IBM) (v.33 \10’ 3 Jams) %: W V0 ; ‘Vo'MOLgBZL'SjV Vf’flfogfom VD: 547/, 3W5 13 Ct § Mcmutseflflwm EM“ is 80) in Jew/as 6% MOW/4’4”"; EMU/1g 35013 OWUM- Vt , - 4,. 26ml: ng 3’43 m/s 0?: mflge’w-B = (my ,. maztaac» Fmax [7L)(-OOS): 3‘ 556 am 934 4m! Discussion # Full Name: Q3. You are a world-famous physics-lawyer defending a client who has been charged with murder. It is alleged that your client, Mr. Smith, shot the victim, Mr. Wesson. The detective who investigated the scene of the crime found a second bullet, from a shot that missed Mr. Wesson, that had embedded itself into a chair. You arise to cross=examine the detective. You: In what type of chair did you find the bullet? Det: A wooden chair. You: How massive was this chair? Det: It had a mass of 20 kg. You: How did the chair respond to being struck with a bullet? Det: It slid across the floor. You: How far? Det: Three centimeters. The slide marks on the dusty floor are quite distinct. You: What kind of floor is that? Det: A wood floor, very nice oak planks. You: What was the mass of the bullet you retrieved form the chair? Det: Its mass was 10 g. You: And how far had it penetrated into the chair? Det: A distance of4 cm. You: Have you tested the gun you found in Mr. Smith’s possession? Det: I have. You: What is the muzzle velocity of the bullets fired from that gun? Det: The muzzle velocity is 450 m/s. You: And the barrel length? Det: The gun has a barrel length of 62 cm. With only a slight hesitation, you turn confidently to the jury and proclaim, ”My client's gun did not fire these shots!” How are you going to convince the jury and the judge? ...
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