# QS01 - Quiz#1 There are 2 problems one on each side of this...

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Unformatted text preview: Quiz #1 10/8/10 There are 2 problems, one on each side of this sheet. Your reasoning must be under- standable to get full credit. 1. An airplane is taking OH on a runway facing southwest. Just after takeoff, its speed is 95 m/s and it is pointing 20° above the horizontal. Using a coordinate system with the :1: pointing east, y pointing north, and z pointing up, what is the airplane’s velocity vector? Do not give a mumerical answer; an expression that can be plugged into a calculator is sujﬁcient. +e «CW/'5 0 Vb‘ov. :: ‘lS-m/s - c.0510 31\$ ' / .s‘n20° >l/\0V\aov\(:ql V3. = clS-VV‘ S \ AyLN) \ .. =_\/ “- )xg ) Vx hwﬁ‘ V “or -6: cl":- cos 2'00 a '2. / \l : —J_ qg Goszoo \M 5 (1 5‘“ 10° 2. The following diagrams show hypothetical ﬁnal states for a collision between two identical balls floating in space. The white ball was initially moving horizontally to the right before it hit the grey ball, which was initially at rest. The collision is not necessarily exactly head-on, and is not necessarily elastic. The arrows show the ﬁnal velocities of the balls. Which ﬁnal states are compatible with momentum conservation? Brieﬂy justify your answer in each case. —3 masses C‘IUH-‘sl =5 P£Dt=0 (35140 =3 not cowpq'tllolc —_——— "3 ' ohm (b) —>'<— —> ———+ Ptoe "‘ "" - I 0 @ =3 COMPQ+‘\D\6 O ‘0 (c) Pitch), #0 \Puy =0 =3 VIE—t “WW” ' 1" (d) a) compqhtlolc ...
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