quiz4-b

quiz4-b - Physics 1A—b ' Quiz # 4 Nov 07, 2003 Prof. Jose...

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Unformatted text preview: Physics 1A—b ' Quiz # 4 Nov 07, 2003 Prof. Jose Onuchic MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Bumpers on cars are not of much use in a collision. To see why, calculate the average force a bumper would have to exert if it brought a 1200 kg car (a so—called "compact" model) to a rest in 15 cm when the car had an initial speed of 2 m/ 5 (about 4.5 mph). Bumpers are built with springs which compress to provide a stopping force without (hopefully) denting the metal. A) 6.5 x 105 N B) 3.2 x 104 N C) 1.8 x 104 N D) 1.6 x 104 N 'E) 5.4 x 104 N 7 Figure 1 30° 30° A 5.0 kg box is held at rest by two ropes that form 30° angles with the vertical. An external force F acts vertically downward on the box. The force exerted by each of the two ropes is denoted by T. A force diagram, showing the four forces that act on the box in equilibrium, is given. ’ 2) In Figure 1, the magnitude of force F is 100 N. The magnitude of force T is closest to: A) 80 N - B) 95 N C) 90 N . ‘ D) 85 N E) 75 N Three blocks, connecting ropes, and a light frictionless pulley comprise a system, as shown. An external force P is applied ’ downward on block A. The system accelerates at the rate of 2.5 m/ 52. The tension in the rope connecting block B and block C equals 60 N. Recall that the tension on different ropes is different. 3) In Figure 2, the external force P is closest to: A) 170 N B) 250 N C) 230 N D) 190 N E) 210 N 4) In Figure 2, the tension in the rope connecting block A and block B is closest to: A) 240 N B) 260 N C) 300 N D) 320 N E) 280 N 5) An astronaut applies a force of 500 N to an asteroid and it accelerates at 7.00 m/ 52 . What is the asteroid's mass? A) 71 kg B) 135 kg C) 441 kg ‘ D) 3500 kg 6) Two 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-kg 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 / 52, what is the tension in the second string attached to the 8—kg masS? A) 14N B) 6.0 N C) 10 N D) 4.0 N A 7) A ISO-N sled is pulled up a 28° slope at a constant speed by a force of 100 N. What is the coefficient of kinetic friction between sled and slope? A) 0.53 B) 0.22 , C) 0.13 D) 0.33 8) Rita accelerates a 0.4-kg ball from rest to 9 m/ 5 during the 0.15 s in which her foot is in contact with the ball. What average force does she apply to the ball during the kick? A) 48N B) 72N ' C) 24N D) 60N 9) A cart of weight 20 N is accelerated across a level surface at 0.15 m/ What net force acts on the wagon? (g = 9.8 m/ 52) A) 0.92 N B) 0.31 N C) 3.0 N D) 4.5 N ,, .4 Jr, ~ '2 '(IZK‘D (‘75w/;z+ “WA +(7. <2 I. Luv) > ’ = Maw—N :71; 0’7311‘4-3" 2 C ...
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quiz4-b - Physics 1A—b ' Quiz # 4 Nov 07, 2003 Prof. Jose...

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