GOLIGHTLY.F01.MT1.1

# GOLIGHTLY.F01.MT1.1 - FRDM FPIX ND Jul[218 221213[31:27PM...

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Unformatted text preview: FRDM : FPIX ND. : Jul. [218 221213 [31:27PM F'l Physics 8A Fan 2001 (Section 1) r. . , MIDTERM 1 1. (15 pts) A ball is hit at a speed of 12.0 m/s from the roof of a building. After 2.5 s it hits a wall that is a horizontal distance of 15.0 m away. (a) At what angle above the horizontal was the ball hit? (b) At what height above or below the level of the roof will the ball strike the wall? (c) What will be the speed and direction of motion of the ball just before it strikes the waIl? ,-- .- 2. (20 pts) A 50 kg block rests on top of a 100 kg block. Between the two surfaces there is a coefficient of static friction 1.15 = 0.25. There is no friction between the bottom block and the surface underneath. What is the maximum force that can be applied horizontally to the upper block without causing it to start slipping over the lower block (i.e., the maximum force that allows the tWo to move together)? What would be the acceieration of the blocks in that case? _ (15 pts) In the diagram below, the object has a mass of 2.0 kg and an initial speed of L Q Vé “(A c h 5.0 m/s. When it reaches the spring (with spring constant k = 1500 N/m), it compresses it a distance of 15 cm before it stops. What is the thermal ener fa i “Wt generated as it slides? gy MuL'ifrm {A 90 “VI FRDM : FPIX ND. : Jul. [218 221213 [31:28PM P2 MKMLM’W l jml [ﬁlamx a) T ’)q.1 hwy/f V= Vilma, T \)6.ol+iw" '2 {ST} “V, v - ”my = .2. — +6fh9 Vi 6‘0 9 1 ”-67, 0‘" 676 below Aofizbh+‘a‘ FRDM : FPIX ND. : Jul. [218 221213 [31:28PM P3 @ p Mm PM 7 FN ‘P‘r p ‘ _..——-a .79 /‘\ .5 X5 Fm-Ig'ﬁI1/‘1Q FIN-{f1 Fr-Ff3MQ F5517 : FA! ”mi: 0 f0 szm5 7;; ’ﬂ: EN P ﬁrm? : (0.2?)(5‘0H91') ‘: )1? N {rt/mt. ”'32/0001 0:41? “Kr" F—£:ma F14: J~Mﬁ FRDM : FPIX ND. : Jul. [218 221213 [31:28PM P4 L?) W'FK‘L'L‘LMH .- 73: mfg; 1", V‘s!) 4'» M5(\/‘#__y{‘j +’LLLC()<_FL'H X'.1) ‘— i (103603-5101) + (Lowcr‘fH—(A‘) 4— 3’: (Jr-oo3(0.;5*‘*~- 0") 2 '— 3’? T Agﬂum 1’ lhjﬂrnﬁk‘uhl "4 333“?” ...
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