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Unformatted text preview: Name: M Midterm 1
Physics 138 — Fall 2200? PLACE ANSWERS IN SPACES PROVIDED FOR EACH PROBLEM. FAILURE
TO DO SO WILL RESULT IN THE PROBLEM BEING CONSIDERED
INCORRECT. l) A ball is dl'Opped from rest. Ignoring air resistance, how far does the ball drop
in 6.30 seconds? Answer: i A? = “fig/{'1
7.
= ._ éﬁzar/ fiX6304) " —/95«.1 A ball is rolling with a constant velocity given by v = [8.65 2} + {2.62)} for
s s 3.75 s. (a) What is xcomponent of the displacement? (b) What is the y
component? 2) 3) 32. L/H Answer: b) 9.99m
(a) 46—1423,! 2 (awf )(st 751,.) = 32.‘/m (a) a, 9/033! 261.4: §)(3.7f4—) =— 359*"! 3) An arrow is shot vertically and reaches a height of 180 m. What is the initial
velocity of the arrow? Answer: 57. ‘I f"  A)‘ =Af—ﬂa’4
2 D
N; = 7.311 41; c. 2311 c (ﬁbre/59090,“) =59H'E 4) A block slides down an inclined plane. If the block is released from rest and
reaches a speed of3.00 mfs in 6.00 s, how far does the block move during that
time? (Assume constant acceleration) Answer: c"L00 (4.1 
4)‘: a)!“ Aft: 4151+ 2‘10!
‘3?" : :3:
Ag ,3”, 9.0M 5) Two cars are moving down a road at 7’0 miﬂu. Car B follows 2.0 m behind car
A. Car A suddenly starts slowing at 3.0 mfsz, while B slows at 2.85 mfsz. How
much time will it take 3 to collide with A if both cars start braking at the same moment?
Answer: 0774... L 1. 'L
a!” =A251‘ +Z’ at”! A51 *éaalt‘ =AMIDI witq”: 'L J. 1'
#6:”a’f1‘ aid/31 laﬂﬂ”)jﬂa lb
A520“ l= _
6L6 ,9 6) A bullet is launched from rest down the barrel of a riﬂe. If the barrel is 1.0 m 10ng and the ﬁnal speed of the bulict is 500 mfs, how long does it take the bullet
to move down the barrel? Answer: \ D. 00 5(4— l 7’) A car accelerates from rest to 300 mifhr in a distance of 0.25 mi. What is the average
acceleration in W52 of this car?
._ F}
4/5 ’0 Answer: I 7 w—t J
1.. 8) A small model rocket is plaeed at the edge of a large expanse of ﬂat, level ground. It rapidly gains a speed of 200. mr’s at an angle of 85 degrees with respect to the ground. How long will it take for the rocket to reach the highest
point in its trajectory if air resistance is neglected? Answer: l 10. 3 A l 9) Vector A has a length of 8.00 uncia and makes an angle of 45° with respect to the x
axis. Vector B has a length of5.00 uncia and lies along the yaxis. What is the vector
sum A — B? Answer: At, 49.00 q) ('05 4;” s 5. (06“.
141 =(?.00A) rim 9;" = 5.4“: 07—105: (3,, = (51001960575 = 0 31 3. 6510014)”?! 70° = 5.0014 10) A Cessna aircraft has a liftoff speed of 120 kmfhr. What is the minimum
constant acceleration the aircraft needs if it is to be airborne after a takeoff run
of 250 m'? r. 1 1) A particular marathon runner completes the run in 3.0 hours. The marathon
distance is 26 mi, 385 yards. What is the average speed of the runner?
7:
Answer: *h—‘V 23...
1 (mm) + §(5‘?5Z4r(1mlzmi 5 (3.0 Arr) 12) A diver stands on a platform 10.0 m above the water. If she steps offin a way
that her initial velocity is zero, at what speed will she strike the water? Answer: PE.
#1: 1; 4 4f: 29‘: = z(9.3*/4—‘:—1)(/o.0m)' 2 I4.) —“,—;‘_ 13) A girl delivering newspapers covers her route by traveling 0.75 mi due east, 0.75 mi due north, and 1.5 mi due west. What is her ﬁnal distance from where
her route started? Answer: L/ 9...”.
Es (0.7s‘@1+(—o.7.5‘m') i O ‘= m1 14) A particular tire is 30.0 inches in diameter , and is rated to last 50,000 miles.
Ignoring wear, how many revolutions will the tire make during its lifetime? '3, 36 x107 Answer: Ozﬂﬂ‘al 0 (a; pygmy#2. ’ xv .= —— :
770! 77—(?0.01'HS .,
23.30x/o 15) A car is capable of accelerating at a constant 1.5 m/sz. How long will it take the
car to get to 70 mifhr'.’ Answer: ‘7 2 0, ? 4‘ ...
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This note was uploaded on 07/09/2008 for the course PHY 138 taught by Professor Meitzler during the Spring '08 term at Sam Houston State University.
 Spring '08
 MEITZLER
 mechanics, Heat

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