9-29-08LectPHY2048

9-29-08LectPHY2048 - PHY2048 Exam 1 Periods E2-E3 (8:20 PM...

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PHY2048 Exam 1 – Periods E2-E3 ( 8:20 PM – 10:10 PM) Sept. 30 ( TOMORROW ) You must go to the room to which you have been assigned (everyone NOT in this room). Use the first initial of your last name and the table to see where you should go. A single, hand-written, formula sheet on 8½ x 11 inch paper (both sides). Bring: A picture ID (preferably your UFID). A calculator (calculators may not be shared), #2 pencils and an eraser Scrap paper will be provided

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Each exam form , with the exam questions, will have a test code in the upper corners. (see right). That code must be inserted in lines 76-80 of your Scantron answer sheet. Your name must appear (print please) on both the exam form and the Scantron (and bubbled on the latter). Both forms must be turned in . Exam Form Scantron
Chapter 1- 6 brief overview Chapter 1 SI units – kg, m, s Units conversion Density M V ρ= Relation between linear dimension, surface area and volume for ideal bodies e.g. A2 ( a b b c c a ) =+ + a b c Va b c = L r 2 ( r ) 2 r L = π+ π 2 Vr L = π r 3 4 3 = π 2 A4 r = π Rectangular solid Cylinder Sphere

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Chapter 2 Displacement: fi xx x Δ =− Average velocity: ave x v t Δ = Δ Instantaneous velocity: t0 xd x vl i m td t Δ→ Δ == Δ Average acceleration: ave v a t Δ = Δ Instantaneous acceleration: 2 2 vd x al i m t Δ = Δ o vt t o v0 0 dv adt dv adt v v adt =→ = = ∫∫ From last:
t o 0 vv a d t =+ If ( and only if ) acceleration is constant (i.e. not a function of t): o a t But if a is constant using (if the acceleration was not constant can still get v but must do the integral). dx v dt = 2 oo o dx 1 va t x xv t a t dt 2 + Combining the boxed eqns. to eliminate time gives: ( ) 22 2 a x x = +−

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Acceleration of an object in the opposite direction from the initial velocity has the opposite sign from the velocity, in which case the object must decelerate (slow down) until it stops at some point. If the acceleration ceases at that time the object remains stopped (e.g. like a car that has slowed to a stop). But if the acceleration continues , after the object stops it turns around so that it’s subsequent velocity and acceleration have the same sign and the object now speeds up traveling in the opposite direction. A ball thrown straight upwards does this. Defining coordinates with y increasing upwards, gravity (near the surface of the earth) causes acceleration –g where g = 9.8 m/s 2 . The ball slows on its way up, rising to a maximum height where its velocity is zero, before speeding up on its way downwards.
HITT#1 (9/29/08) A ball is thrown straight up in the air in a standard coordinate system (y increasing upwards). At the top of it’s trajectory its acceleration is: A. positive B. negative C. zero

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This note was uploaded on 08/25/2011 for the course PHY 2048 taught by Professor Field during the Fall '08 term at University of Florida.

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9-29-08LectPHY2048 - PHY2048 Exam 1 Periods E2-E3 (8:20 PM...

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