Exam2-11am

Exam2-11am - Name(please print Last First Section...

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Unformatted text preview: Name (please print): Last First Section Number .(e.g. M014) SUID ‘ Physics 211, Spring 2011 Exam 2 (11:00am lecture) Document your work or earn no credit. Use the back of each sheet if you run out of space. Cross over any parts that correspond to given up thoughts. For numerical answers give at least 2 signiﬁcant digits and specify units. Assume g=10 m/sz throughout this exam. % 1. Pilot has been ordered to head north with a speed of 500 mph. He has been informed that wind is 170 mph in the south-west direction. ( cos450=sin450=0. 7071) a) [15 pts] What shoxﬁd be the speed (in mph) of the plane with respect to the air to accomplish this oal? \ ' g ‘l /\ 09,13 ~ Plow valet-ﬂ 56W” '1 A p 01 0 £2 \ /T :3 Q 8 v» 4‘ v‘ -b l :3 O ‘Y‘, K A \L = (000.707! . 5004-1700-7071 : 0201,6201) .9 S 10P‘0~1: W2 :2 (‘20.27+520_2;= b) [5 pts] Which direction the nose of the plane should be pointing to‘l! (Use degrees for units of angles) N (1)“ Sm me: 010’: '3 0 . l *‘f wad 0 - , w ( 60—61- of' WW‘H"> Phy211 Spring 2012 ' Syracuse University Exam 2 (1 1:00 am) Page 1 ‘9‘” ‘0 w»ka of ‘0'?“ 2. A block of mass m1=6 kg is on top of a block with mass m2=8 kg. The lower block is being pulled with a string as show below. The blocks are moving together to the right with the same increasing speed. Their acceleration is 2.5 m/sz. Coefﬁcient of static friction between the upper and the lower block is 0.35. The coefﬁcient of kinetic friction between the lower block and the table is 0.3. é T a) [10 pts] What is the magnitude of the frictional force between the upper and the lower block? \. A l “‘1 gals ’: ﬁ‘z 3 } I‘V‘ Y‘diveblxﬁm ., ‘ ——-—~) 2‘ “~82 QQ«25=6'2.S: b) [10 pts] What is the tension in the rope? appvamoln I) Lana} Mad—M2 a; Mail QM+W2>Q = T- jam 0 = N rwae)? 34¢ ¢ chN i ”‘ (WWW!) (OVV‘Kgr) l) [q .(2.§+o.3wo)= 77 (\I / Phy211 Spring 2012 Syracuse University Exam 2 (11:00 am) Page 2 D ’: v‘z ’— \M( a, wot: {1‘25 3. Jack and Bobby are pulling a sled on snow, each exerting a force of 64 Newtons. Jack is pulling the sled horizontally, while Bobby at an angle of 35° to the horizontal (see below). The sled has a mass of 13 kg. Coefﬁcient of kinetic friction between the sled and the snow is 0.15. (cos35"=0.8192, sin35°=0.5736 ) Bobby 0 35 Jack Z a) [10pts] What is the normal force on the sled from the snowy ground? ik T- dc‘VJcL-‘OH.’ mismums‘ m :mimm m In ‘K” it‘V‘CLW‘: Vs 52 Phy211 Spring 2012 Syracuse University Exam 2 (11:00 am) Page 3 4. A ball with a mass of 3.5 kg is suspended on a string with a length of 0.45 m. The ball has been given a speed of 5.5 m/s with the string stretched vertically and it goes up along the circular path. I” \\\ I \ I’ “ ,1 O 45 ‘ v = 3.8 m/s 1 . m : . P2 “ I ‘ I \ I \ I \ ,’ \\\ ” 131 v = 5.5 mils a) [10 pts] What is the tension in the string at the bottom point (P1)? T V WOL: T’ 9‘4"? W} i b) [10 pts] The ball slows down and has a speed of 3.8 m/s at the point when the string is horizontal. What is the tension in the string at this location (P2)? 4“ In yfAdchcho‘ﬁ: (' 27‘ L4.“ W7? 0"? ‘ PhYZ“ Spring 2012 Syracuse University Exam 2 (11:00 am) Page 4 7 " ' t % E t a 5. [20 pts] An elevator is accelerating up with 4.5 m/sz. Jill is pushing a box on the elevator ﬂoor with a constant speed. The coefﬁcient of kinetic friction between the box and the floor is 0.35 and the box has a mass of 22 kg. How much force does Jill exert on the box assuming she is pushing in the horizontal direction? 4‘ Y \M ’— S1. 0 Ma 7 N” “A? n X “‘2’”: [if .. -~ Phy211 Spring 2012 Syracuse University ' ' “Exam2 (11:00 am) Pages ’ ’ " ' ‘ ...
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Exam2-11am - Name(please print Last First Section...

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