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Material Type: Exam; Class: Newtonian Mechanics; Subject: Physics; University: Kettering University; Term: Winter 2008;
Typology: Exams
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Winter 2008 PHYS- 114 Test #1 Page 1 of 6
[2] You must show ALL work in order to receive complete credit for any of the problems. Failure to show complete work in a clear, logical fashion (ie, your professor must be able to figure out what you were doing) will result in loss of points. [3] Students will be held to the Kettering University Code of Academic Integrity. of cheating (either giving or receiving help) will result in a ZERO on this exam, and all students Any instance involved will be referred to the Dean of Students in Academic Affairs for further action. [4] Any disputes about the grading of this exam (other than simple errors in adding must be addressed in writing within three class days after the graded exam is handed back. up points)
Descriptions of Motion Kinematic Equations of Motion Quadratic Equation If !
a t^2 + b t + c = 0 then !
t = " b^ ±^ b 2 a^2 "^4 ac Newton’s 2nd^ Law of Motion
!
a^ r =^ F m^ r
ax = dv dtx !
a^ r avg = " "^ v r t !
vx = dx dt !
r vavg = " " r r t
!
"r r = r r f # r ri
Page 2 of 6 PHYS- 114 Test #1 Winter 2008 [1] (8 pts) A box slides down a ramp and then across a slippery and indicate how you obtained your acceleration vectors in region A, B, and C. floor. Draw a complete motion diagram
[2] (8 pts) The grid below shows two vectors. (a) Express vectors
!
A^ rand !
B^ rin unit vector notation.
(b) In the space provided on the grid graphically determine the resultant vector
!
R^ r = 3 A r " 2 B r. (c) Express the resultant vector !
unit vector notation.^^ R^ rin
(d) Then determine the magnitude of your resultant vector !
R^ r.
Page 4 of 6 PHYS- 114 Test #1 Winter 2008 [5] (50 pts) Jimmy decides to go bungee jumping off a tall bridge. T of the river below. The bungee cord Jimmy ties to his ankle is 25m long when unstretched (this means hehe bridge is 65 m above the surface will fall 25m before the bungee cord begins to slow his motion). falls the first 25m, after which the bungee cord begins to stretch and provides an acceleration with Jimmy steps off the bridge and free- magnitude 6.1 m/s/s. Does Jimmy get his hair wet, or does the bungee cord stop his motion before he hits the water? MODEL (4 pts):
VISUALIZE (34 pts):
Winter 2008 PHYS- 114 Test #1 Page 5 of 6 SOLVE (8 pts):
ASSESS (4 pts): What is the answer to the question? (Justify it with the results of your solution)