Ellmlnation Examination ln Phyeics

Narre:lnrtructon Section:Multiple Choica; Choose the letter that conespond to your an$ver.1. The dcnsity ofan object is detrned as:

a. the volume occupied by each unit of mass.

b. the amountof mass for each unit ofvolume.c. the weight of eachunit of volume.

d. the afrount ofthe substance that has unit vol. & unit mass.

d. L2x,lC,a

Program:cP#:

2. Id€ntical point charges B are placed at each ofthe four corners of a 3.0 m x 4.0 m rectangle. lf I = qa r{, what is the

nagnitude oftheelectrostatic forc€ on sny one of the charges?

i.lott b.2.4N c, 1.8N ' d.9.7N3. One molo of the carbon-I2 isotope contains 6.022 x 104 atoms. What volumc in m3 would be needed to store one mole of cube-

shapd children's blocks 2.00 cm long on each side?

a. +.g * tott b.1,2 x Lf o. 6,0 x 1023

4. The standard onm pqge is 8.50 inches by 1 1 .0 inchos: Its area in crrz is

a.19.5 b.36,8 c.237 d.6035. In2.0 s, aparticlemovingwithconstantaccelerationalongtheraxisgoes&omx= 10mtor= 50 m. Thevelocityattheendofthis time intqval is 10 m/s. What is the acceleration of the particle?

a. +15 m/s2 b. +20 rnls2 c.4a mlt d. -10 ds26. An automobilo traveling along a straight road increases its s@ from 30.0 m/s to 50.0 nrls in a distance of 180 m. If the

acceleration is constant, hiw mrich timjelapses while the auto moves this distance?

a. 6.00 s b. 4.50 s c. 3.60 s d' 4.00 s7. A rocket, initiatly at rest, is fired vertically with an upward acceleration of l0 r/f. At an altitude of 0.50 krn, the

eqgine ofthe rockg cuts ofr What b the ma:rinium altitude it achieves?

a. 1.9km b. 1.3km c. 1.6km d' 1.0km8. A car travels north at 30 rn/s for one half hour. h then travels south at 40 m/s for 15 miiutes. The total distance the car has trsvel€d

and its displacement are:

a 18 knq 1S km S. b. 36 km; 36 km S. c. 36 km;36 kmN. *d 90-lq-18 kmN.

9. Ifi - 12i- l6j and d - -24i+ 10i, what is the magnitude ofthe vecbrC = d^- E?

a.42 b.22 c.64 d.90f 0. Theinitial speed of a cannon ball is 0,20 lnn/s, If the ball is to strike a target that is at a horizontal distance of 3.0 km from the

cannon, what is the minimum time of fligbt for the ball?a.16s b.21 s c,24 s d.14s

11. A rifle is aimed horizontatly at the oeoter of a large target 60 m away. The initiat speed oftlre bullet is 240 rnls. Whu is the

distance from the center ofthe target to the point where the bu[et strikes the target?

a.48 om b.17cm c.31om d.69 cm

12. Ifthe only forces acting on al.}-kgmass are F, - lti- tj) N ane F, - qSf * ti) N, what is the magnitude ofthe accelerstion

ofthe oarticlc?

" r.s Jr': b. 6.5 m/s2 c.4.7 mlsz d.9.4mts2

13. A 1.8-kg block is projected up a rough 10o inclined plane. As the block slides up the incline, its aocalerstion is 3.8 m/s2 down the

incline. What is the magnitude ofthe force of&iction acting ontheblock?a. 5.0 N b. 3.8 N c. +'2 N d. 4.6 N

14. Haw much work is done by a person liftiag a 2.0-kg object &om fie bottom of a well at a constant spd of 2.0 nls for 5.0 s?

t.0.22k1 b. 0.20 kJ c. 0.24 kJ d.a,27w15. A ctra6pion athlete can produce one horsepower (?46 W) for a short penod of time. The nrmber of 16 cm high steps a 70 kg

ithlete could ascend in one minute while ocpending one horsepower is

t.4 b.7 c.65 d.40816. A 2.4-kg Ssil falling v€rtically hits the floor with a speed of 2.5 rn/s and rebounds with a speed of 1.5 m/s. What is the magniarde

ofthe impulse exertd on the ball by the floor?

a.9.6N's b.2.4N"s c.6'4N's d. 1.6N's

lZ. A wheel rotating about a fixed a,xis has an angular position given by 0= 3.0 - z.Of ,whene d is measured in radians and r in

seconds. What is the angrrlar acceleration of the wheel at / = 2.0 s?-

a. -1,0 rad/s2 b. 4a ralrl{ c. -2.0 rad/sz d. -4'0 rad/s2

1 8. How large a foroe is decessary to stretoh a 2.0-mm diameter copper wire (I: I I x t0t0 N/m2) by I .Wo?

a, 2.1 kN b. 3.5 kl'I c. 6.91N d. 1l ld{19. A 50-kg sate[ite circles planet Cruton wery 5.6 h in an orbit with a radius of 12 x 106 m. What is the magnitude of the

gravitational force ou the satellite by planet Cruton?4.63 N b. 58N c.68N d.73 N

20. All peoplg oom€ very "Lrr

* Uriog able to float in water. What therefore is the volume (in cubio meter$) of a 50-kg woman?

a. O.CCZ b. 0035 o. 0.050 d' 0.0?0 t