1. The number of significant figures in the number is a. 4 b. 5 c. 6 d. 7

Transcription

1 Name: ID: Anwer Key There a heet o ueul ormulae and ome converon actor at the end. Crcle your anwer clearly. All problem are pont ecept a ew marked wth ther own core. Mamum core 100. There are a total o 46 problem. Procedure mut be hown n ree tyle problem or ull credt. 1. The number o gncant gure n the number a. 4 b. 5 c. 6 d. 7. The area o a rectangle whch 4.5 cm by 3.5 cm correctly gven by a b c d The length o a car gven a 6.5 m. The percent uncertanty n th meaurement a. % b. 0% c. 1% d. 10% 4. A heet o paper meaured to be 0.0 cm by 40.1 cm. It area correctly gven n SI unt by (No anwer. Everyone get the pont.) a. 800 cm b cm c m d m 5. Two hundred ty gram equvalent to a..56 kg b kg c kg d kg 6. Newton' Law o Unveral Gravtaton tate that the orce between two mae m1 and m, eparated by a dtance r gven by F = Gm1m/r. Force ha dmenon kg m/. The unt o the gravtatonal contant G are a. none, G dmenonle b. kg m/ c. m/kg d. m3/(kg ) 7. A tudent run back and orth on a track ve tme coverng a total dtance o 500 m. Her dplacement : a. 500m b. 500 m c. 100 m d. 0 m 8. A peron run rom home to the tore and back agan, a total dtance o 1.5 m. It took hm 10 mnute on the way to the tore. He pent 0 mnute n the tore. On the way back home, he met h rend and talk to hm a whle. So the return trp took hm 0 mnute. What h average velocty through the trp. a. 1.8 m/hr b. 3 m/hr c. 0 m/hr d. cannot be determned nce he topped on the way back. 9. The plot o y v. or an object' moton a parabola. The acceleraton o the object a. zero b. contant c. varable d. cannot be determned 1/6 Turn Over

2 10-15] A car tart rom ret and accelerate at 5 m/ or 10 to potve -a. It travel at contant peed or 40 and then low down at a rate o 1 m/ to ull top. Anwer the ollowng queton. The procedure mut be accompaned wth the anwer. You wll not get ull credt by jut wrtng down the anwer. 10. What the velocty ater completng the rt 10 o the moton? [3 pont] An] v = v + at = = 50 m/ 11. What the dtance covered durng the rt 10 o the moton? [3 pont] An] = vt + at = 0 + = 50m 1. How long doe t take or the car to come to ull top through the nal egment o the moton? [3 pont] An] v = 50 m/ ; v = 0 m/ v = v + at v v 50 t = = = 50ec a What the average velocty o the moton? [3 pont] An] Dplacement n the three egment are = 50m 1 1 = vt + at = = 000m = vt + at = ( 50) = 150 = + + = = 3500m v= = = = 35 m/ t What the total dtance covered by the moton? [3 pont] An] From the above: 3500m 15. What the dplacement through the moton? [3 pont] An] From the above: 3500m nce the moton wa along the potve a. 16. A ball thrown downward rom a cl wth a peed o 15 m/. Ater 10, t velocty wll be: a. 98 m/ b. 113 m/ c. 0 m/ d. 9.8 m/ /6 Turn Over

3 17. Two object are thrown o a cl wth the ame peed. One thrown drectly up, the other drectly down. The ball thrown upward ht the ground a. ater than the one thrown downward b. lower than the one thrown downward c. at the ame peed a the one thrown downward d. Cannot be determned nce the acceleraton not known 18. A ball thrown upward wth an ntal velocty o 5. m/. How long wll t take to reach t mamum heght? a b c d. Cannot be determned wthout acceleraton 19. A ball thrown traght up wth non-zero velocty on top o Mt. Hmalaya. What the drecton o the acceleraton throughout the ball moton? a. The drecton ntally pont upward then lowly turn around to pont down a the ball decend. b. The acceleraton alway pont upward. c. The acceleraton alway pont downward. d. The drecton cannot be determned nce the eact value o the ntal velocty not known. 0. A nckel and eather are dropped multaneouly n a ntrogen-lled tube. The net acceleraton o the eather a. greater than that o the nckel b. le than that o the nckel c. the ame a that o the nckel d. cannot be determned nce they do not move n a ntrogen-lled tube 1. Vector A ha an component o X and a y component o Y. The angle A make wth the a a o b o c. co(x/y) d. tan -1 (Y/X). Three vector are gven by: A =, Ay = 10, B = 9, By = 1, C = 4, Cy = 15. What the magntude o the vector A+B-C? a. 9.9 b c d You walk 10 m due outh and then turn and walk 5 m n a drecton 45 o north o eat. Your total dplacement (No anwer. Everyone get the pont.) a. 14 m b m c m d m 4. The magntude o the addton between the two unt vector and j a. b. 0 c. 1.4 d ] A projectle wa launched at an unknown angle wth repect to horzontal. Anwer the ollowng ere o queton. 5. What the acceleraton n th moton? Gravtatonal Acceleraton or 9.8m/ or -9.8m/ 6. Whch o the ollowng tatement true or a projectle launched at l? a. It peed contant. b. It horzontal peed decreae c. The acceleraton and velocty vector are alway ant-parallel. d. It vertcal component o velocty change gn. 3/6 Turn Over

4 7. The projectle wll have mamum range or a gven ntal peed t' launched at an angle o a. 30 b. 45 c. 60 d Whch o the ollowng tatement true or two ball thrown n the ar at derent angle wth the horzontal? a. the ball makng the teeper angle pend more tme n the ar b. the ball makng the hallower angle pend more tme n the ar c. the tme o lght depend on the ntal peed gven each ball. d. none o the above 9. You are on a merry-go-round o dameter 10 m revolvng at 0.1 rev/. The magntude o your centrpetal acceleraton : (No anwer. Everyone get the pont.) a. 4 m/ b m/ c m/ d. 8 m/ 30. Whch o the ollowng tatement true or a partcle n unorm crcular moton? a. It velocty and acceleraton vector are alway parallel b. It velocty and acceleraton vector are alway perpendcular. c. It acceleraton vector contant. d. It velocty vector contant. 31. Whch o the ollowng not an nertal rame o reerence? a. a car movng at contant velocty b. a rotatng merry-go-round c. an nclned plane d. a plane lyng at contant velocty 3. A bo t on a table. You can reduce the normal orce o the table on the bo by a. eertng an upward orce on the bo b. eertng a downward orce on the bo c. no mean; t contant d. none o the above 33. A peron tand on a cale n a ree allng elevator. The readng on the cale a. zero b. the peron' true weght c. more than the peron' true weght d. le than the peron' weght, but not zero 34. Whch o the ollowng tatement true or a par o orce obeyng Newton' Thrd Law? a. they are parallel to each other n the ame drecton b. they act on the ame object c. they are perpendcular to each other d. they act on derent object 35. A car collde wth a truck. The orce eerted by the truck on the car a. greater than the orce eerted by the car on the truck b. le than the orce eerted by the car on the truck c. the ame a the orce eerted by the car on the truck d. not necearly related to the orce eerted by the car on the truck. [36-40] A 10 kg block lde down a rctonle plane nclned at 15 wth repect to the horzontal plane. 36. What are the orce actng on th block? Gve ther name not ther ze. An] Gravtatonal orce Normal orce 37. What the drecton o the gravtatonal orce eerted on th block? a. Along the nclne toward the bottom b. Down toward the center o the earth c. Along the nclne toward the top d. Cannot determne wth the gven normaton 4/6 Turn Over

5 38. Draw a ree-body dagram o th moton. 39. Wrte down the two orce equaton on and y drecton. [ pont each, totalng 4 pont] F = mg n15 = ma ; F = n mgco15 = What the acceleraton o the block? y An) From the rt equaton above, one can obtan ma = mg n15 cancelng ma m on ether de, the acceleraton a = gn15 = 9.8n15 =.5 m/ downward, along the nclne. 41. You rt apply a horzontal orce to drag a bo acro a loor. I ntead you apply a orce o the ame magntude but an angle above the horzontal, doe the orce o knetc rcton a. become greater b. become maller c. reman the ame d. none o the above 4. A block placed on a plane nclned at angle θ and reman tatonary. From th obervaton what can we conclude? µ k a contant o knetc rcton, and µ a contant o tatc rcton. a. µ k > tanθ b. µ k < tanθ c. µ < tanθ d. µ > tanθ 43. A block placed on an nclned plane where t held at ret by rcton. A orce then appled parallel to the plane pontng up the plane. Whch o the ollowng tatement true? a. A the magntude o the appled orce ncreae, the rctonal orce change drecton and magntude. b. A the magntude o the appled orce ncreae, the rctonal orce goe rom pontng down to pontng up the plane. c. A the magntude o the appled orce ncreae, the rctonal orce goe rom pontng up to pontng down the plane. d. The orce o tatc rcton alway equal n magntude the appled orce. 44. A block o ma kg attached to a trng that wll break the tenon eceed 500 N. I the block whrled n a horzontal crcle o radu 0.5 m, t mamum peed wll be a.. m/ b. 11 m/ c. 5 m/ d. 15 m/ 45-46] Wrte down the ollowng: 45. Three bae unt o SI unt ytem An] Length: m, Tme: ec, Ma: kg 46. The unt o work epreed n bae unt An] Joule=kg m / 5/6 Turn Over

6 Ueul Formula Some converon actor: 1 n =.54 cm; 1yd = 0.91 m 4π 3 Volume o a phere wth radu r: V = r 3 Volume o a cylnder wth radu r and heght h: V = π r h Rule o dervatve: n ( + b) n 1 d at dt = nat + 0 Some 1-dmenonal Knematc ormulae: v = v + at v 1 = + vt + at ; = v + a ( ) y y + v t = y + 1 ayt One revoluton per econd or a crcular moton wth radu r equvalent to the lnear peed n a crcular moton: v = π r m/ v Centrpetal acceleraton: a r = r Newton nd law o moton: F = ma ; F y = may Magntude o the gravtatonal acceleraton g = 9.8m /. The oluton or a -dmenonal equaton: are: a + b + c = 0 b ± = b 4ac a 6/6 Turn Over