PHY 138 - Midterm 1 Practice Exam

PHY 138 - Midterm 1 Practice Exam - Name M Midterm 1...

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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 x-component 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: 0-774... L 1. 'L a!” =A251‘ +Z’ at”! A51 *éaalt‘ =AMIDI wit-q”: '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 y-axis. 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 lift-off 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 .= —— : 77-0! 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.

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PHY 138 - Midterm 1 Practice Exam - Name M Midterm 1...

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