Practice Physics 2

# Practice Physics 2 - Physics 1A—b Final Dec 10 2004 Prof...

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Unformatted text preview: Physics 1A—b Final Dec. 10, 2004 Prof. Jose Onuchic Course Code Number _ Comments: ..~_.__..-__. . MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Twu blocks of masses 20 kg and 8.0 kg are connected together by a light string and rest on a frictionless level surface. Attached to the 8-1:}; mass is a second light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 0.5 m/sz, what is the tension in the second string attached to the 8-kg mass? . A)20N Ble Cl4N (ﬁll-4N ) EHUN 2) A 0.10-kg object moving initially with a velocity of + 0.20 m/ 5 makes an elastic head on collision with a 0.15 - kg object initially at rest. What percentage of the original kinetic energy is retained by the 0.10 - kg object? . A) 50 '5, B) 96 ‘5- C) l2 ‘5. a E) 24 '5. 3) Ceosynchronous satellites orbit the Earth at a distance of 42 000 km from the [Earth's center (not surface). Their angular velocity at this height is the same as the rotation of the Earth, so they appear stationary at certain locations in the sky. What is the gravitational force acting on a l SOD-kg satellite at this height? - r to determine the velicity or angular velocity of the satellite) W B) 85 N C) 457 N D) 404 N 4) An Olympic skier moving at 20 m / 5 down a 30 '3 slope encounters a region of wet snow, of coefficient of kinetic friction 0.74. How far down the slope does she r.—— * topping? A) 170 m B) 199 m D) 119 m 5) Consider the following mas distribution in the X-axis. On mass of 40 kg at position x=-4m and a mass of mass 120 kg at position x=4 tn. The position of the center of mass is at the following value a . . Al-Zm B)-lm c:)1m D)0m w 6) A crane drops a 0.30 kg steel ball onto a steel plate. The hall's speeds just before impact and after are 4.5 m/s and 4.2 m/s, respectively. If the ball is in ' act with the plate for 0.03 5, what average force does th hall exert on the plate during impact? A) 14.5 N B) 3.0 N D) 43 N E) 133 N 7) A miniature spring—loaded, radio-controllet‘l gun is mounted on an air puck. The gun's bullet has a mass of 5.00 g. and the gun and puck have a combined mass of 120 g. With the system initially at rest, the radio Controlled trigger releases the bullet causing the puck and empty gun to move with a speed of 0.500 m/s. What is the bullet's speen; A)48mis w C)8m/s D) 24 m/s F.) 64 m/s Figure l A system comprising blocks, a light frictionless pulley, a frictionless incline. and connecting ropes is shown. The 9 kg block accelerates downward when the system is released from rest. Recall that the tension on different ropes will be different! 8) In Figure l. the tension in the rope connectin' k 7 block and the 4 kg block is closest to: A)30N B)33N r? D)36N E)39N 9) In Figure 1, the accelerati - a 'stem is closest to: A) 1.9 rn/s2 w C) 1.5111/52 D) 2.3 m/s2 E) 1.7 m/s2 10) The following force vectors act on an object: i) 50.0 newtons at 45.00 north of cast and ii) 25.0 newtons at 30.0" south of east. Which of the following represents the magnitude of the resultant and its angle relative to the easterly direction? A) 33.8 newtons 17.70 B) 75.0 newtons 7.500 C) 23.4 newtons 18.30 D) 12.8 newtons 37.50 E 61.4 newtons 21.8 11) A uniform 1.0—N meter stick is suspended horizontally by vertical strings attached at each end. A 2.0-N weight is suspended from the lO-cm position on the stick, another 2.0-N weight is suspended from the 50 cm position, and a 3.0—N weight is suspended from the 60 cm position. What is the tension is the string attached at the 100-cm end of the stick? A) 5.0 N B) 4.5 N D) 4.0 N E) 3.0 N 12) A 5 OOO-N weight is suspended in equilibrium by two cables. Cable 1 applies a horizontal force to the right of the object and has a tension, Tl. Cable 2 applies a force upward and to the left at an angle of 37.00 to the n mum- - - 's and has a tension, T2. Find T2 m BHOODN C)334DN woman E)9420N 13) A 2 000~kg ore car rolls 50.0 m down a frictionless 10.00 incline. If there is a horizontal spring at the end of the incline, what spring constant is required . ‘ )re car in a distance of 1.00 m? A) l960kN/m B) 500 kN/m C)340l<N/m D) 980 kN/m E) 681 kN/m '14) A parachutist jumps out of an airplane and accelerates with gravity to a maximum velocity of 58.8 m/ s in 6.00 seconds. She then pulls the parachute cord and after a 4.00-second constant deceleration, descends at 10.0 mi 5 for 60.0 seconds. reaching the ground. From what height did the parachutist jut A) l 750 m B) 1 320m C) 1 520111 D) 1 130 m E) 914 m 15) A parachutist of mass 50.0 kg jumps out of an airplane at a height of ‘l 000 m. The parachute deploys, and she lands on the ground with a velocity of 5.0 m/ 5. How much energy was lost to air friction during this jump? .—-- A) 49400] B) 98 700) D) 198 000 J F.) 312 000 J 16) Omar throws a rock down with speed 12 m ls from the top of a tower. The rock hits the ground after 2.0 s. /H ’ e height of the tower? (air resistance is negligible) @ B) 20 m C) 03 m D) 54 m E) 24 m 17) A 2 500kg truck moving at 10.00 m/ s strikes a car waiting at a traffic light, hooking bumpers. The two continue to move together at 7.00 m/ 5. What was the mass of the struck car? A) '1 200 kg B) 1 550 kg C) 1 730 kg ( D) 1070 kg > 18) The gravitational acceleration at the surface of Saturn is 11.2 m/sz, and the radius of the planet is 58,200 km. The altitude above the surface of Saturn, at which the weight of a body is equal to that on the surface of the earth, in km, is closest to: A) 6900 B) 4800 C) 5800 D) 8300 E) 4000 19) An automobile driver puts on the brakes and decelerates from 30.0 m /s to zero in 10.0 s. What distance does the car travel? - A) 196 m C) 336 m D) 100 m E) 392 m 20) A fireman, 50.0 m away from a burning building, directs a stream of water from a fire hose at an angle of 30.0" above the horizontal. if the velocity of the stream is 40.0 m / s. at what height will the stream of water strike te building? «1% B) 13.4 at 022.4111 D) 15.2 In F.) 9.60 m 21) A helicopter is traveling at 40 m/s at a constant altitude of 100 mover a level field. If a wheel falls off the helicopter, with what speed will it hit the ground? (g 9.8 m/s2 and air resistance negligible) .~\)40m/s @ C) 50m/s D) 80m/s E) 70m/s 22) A SOD-kg crate is placed on an adjustable inclined plane. As one end of the incline is raised, the crate begin: to move doanard. If the crate slides down the plane with an acceleration of 0.70 m / s when the incline a - ’ 50 , what is the coefficient of kinetic friction between ramp and crate? (g = 9.8 m/ s2) ® B) 0.42 C) 0.12 D) 0.30 E) 0.47 23) A simple pendulum, 2.0 m in length, is released with a push when the support string is at an angle of 25 0 from the vertical. 1f the initial speed of the suspended mass is 1.2 m/ s when at the release point, what is its speed at the bottom of the swing? (g = 9.8 111/52) A) 0.5 m/s B) 2.0m/s C)2.6m/s Situation 1 X 4.0 kg solid sphere, made of metal whose density is 3000 kg/ m3, is suspended by a core. 24) In Situation 1, when the sphere is immersed in a liquid of unknown density, the tension in the cord is 18 N. The density of the liqui . ' - - A) 1200 kg/m3 m C) [500 kg/m3 D) 1400 kg/m3 E) 1300 kg/m3 313... @573 a £3 5.5. m manna 0“ .5 2 05.... a :25. 9.5.358 a“ are 3. z. m Eamon...— moHna on N.» 7. m :8 23132.92 5 m amnonzoz ovvcmzm .c :5. on :5 29.5.... \$.73 52 201/. mm 9:5 as .7... 8.53343 5:: my 3.: Q rm“: \\... UV ma: ...
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## This note was uploaded on 10/13/2010 for the course PHYS physics 1a taught by Professor Jose during the Fall '10 term at San Diego.

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Practice Physics 2 - Physics 1A—b Final Dec 10 2004 Prof...

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