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Unformatted text preview: Physics 160 Exam 1
" Wednesday, February 12, 2003 Directions: The exam consists of two parts. The ﬁrst is multiple choice. In the second part you are to
solve three problems; here it is important to show your work/thoughts. The maximum possible score is
100 points. The point—values of each question are indicated; allocate your time wisely. Part 1
(1w8pts) A person having a mass of 81 .6k'g is standing still. What is the net force (total force) on this person?
(a)1600Nj.
(b)800Nj c 800Ni. (2—8pts) A baseball having a mass of 0.50kg is dropped ﬁom rest. How long does it take for it to fall 4.9m? (gig: _ diaﬁJf} in (3?: 4‘3"“ :1: .OS. 4' rag“?
(d)0.55.
i (38pts) A climbing rope weighing SON hangs from the ceiling of the Johnson gymnasium. What is the tension in the rope at a point halfway to the ceiling? (I f (a)lOON. 4’ E .T‘ 431) z 1 WU
; (b)50N. L5,! w T e z @zsN. ~ ~ * “““ F ‘3' 1"”  (d)0N. ﬁl%;r~
(4? A stone is thrown vextically upward with an initial Speed of 9.8m/s. What is its maximum height?
(a) .9m. 0 ‘
)9.8m. { “U? + 244x
(o)19.6m. 1 z N “1
(d)29.4m._ 9 WA ) a in? m ‘ L54
A x : f  Z A , Exaggng (5—8pts) An 0%50kg hockey puck sliding on an ice rink has an acceleration 3 = 3rm’s2 5+ 4111/32 3. What is the net force F acting on the puck? #9 n MT
a 5N. A F n A L __ Inf/£14 i'ZJU
.5Ni+2N.  1321.. + MK?‘ “
J — O “S‘K a 'l
c 3N i+ 4N j. — 3 5
(d)6N 2+ 8N j. (68pts) A man weighing 1000N on the earth checks his weight by standing on a scale which is inside a
moving elevator. If the elevator is accelerating upwards at a rate of 4.9m/s2, what is his weight (in Newtons) according to the elevator scale?
N a. m g ‘2. m 6L $252331; >< 3:... a (ZOOON: l g M m]: mg + Mic.) SOON. /// NTimaa/ N = [wouwﬂm i a (mom 4:5" (7—8pts) A cannon ball is launched at an angle of 45 degrees with a muzzle velocity of 495kmfhr. How fast
is it moving the instant it reaches its maximum height? (a)495km/hr. _ _
09am w ‘P w is —— Cgsoma rig—4 L wearer") (88 A hockey puck slides on an ice rink with a velocityiz> = 3m/s 3+ 4ni/s 3. What is its speed? M a 2 2 m ._ J"?!
(mom. 1w W /s é (d)25m/s.  Part 2
(llSpts) A cat walks across the ﬂoor in the xdirection. The position of the cat as a function of time is
shown in the graph below. (a) Make a graph showing the velocity of the cat as a function of time. Be sure to
label your axes, and indicate the coordinates at the major points of interest. (b)Make a second graph
showing, qualitatively, the cat’s acceleration versus time. 4 We) 15 (I J (2—15pts) A glider having a mass m = 0.50kg is held in place on a fn'ctionless horizontal surface. It is tied to a thin cord which passes over a frictionless pulley and attaches to a hanging weight having a mass m2 = 1.5kg, as shown in the ﬁgure below. What is the tension in the cord aﬁer‘ the glider is released?
(Neglect the mass of the cord and the mass of the pulley.) Q4 ma“ ‘
: P1463,"l 1: Z “425‘
i “F a .r—~ q “41
m (3—6pts) At time t = 0, a football receiver leaves the quaterback and runs down the ﬁeld at a constant
velocity 31' = 11m/s i. The quaterback wishes to pass the ball so that it can be caught by the moving receiver
at a point 50m away. He consistently releases the ball with a speed of 28m/s. Assuming that he aims
properly, at what angle of inclination must he throw in order to have a successful pass? At what time 1‘ must he make this throw? (Neglect air friction.) W at.” .LmJ ’44 We 4" l
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 Spring '08
 Walker
 Physics

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