2048_Spring09_FinalExam

1 889 j 2 900 j 3 11 j 4 600 j 5 0 j 10 a block of

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generated in the heating up of the block and the bullet during this collision? (1) 889 J (2) 900 J (3) 11 J (4) 600 J (5) 0 J 10. A block of mass m is attached to a cord that is wrapped around the rim of a flywheel of radius R and mass M , hangs vertically as shown in the figure. The rotational inertia of the flywheel is I = MR 2 / 2. If m = M/ 2, when the block is released and the cord unwinds, the acceleration of the block is: (1) g/ 2 (2) 2 g/ 3 (3) g/ 3 (4) g (5) g/ 4 11. A particle is located on the positive x axis a distance d from the origin ( i.e. , at the point P = (x,y,z) = (d,0,0)). The angular momentum about the origin is non-zero and points in the negative y direction. The velocity of the particle must be: (1) in the positive z direction (2) in the negative z direction (3) in the positive x direction (4) in the negative x direction (5) in the positive y direction 12. The coefficient of static friction between a solid spherical ball with radius R and a horizontal floor (x-axis) is 0.40. What is the magnitude of the maximum acceleration in the x-direction the ball can have without sliding? (1) g (2) 0.1g (3) 0.2g (4) 0.4g (5) 0.8g 13. A picture P of weight W is hung by two strings as shown. The magni- tude of the tension force of each string is T and the angle of each string with the horizontal is θ . The total upward pull of the strings on the picture is: (1) W (2) 2 W cos θ (3) T sin θ (4) T cos θ (5) 2 T cos θ 14. To measure the mass of a planet with the same radius as Earth, an astronaut drops an object from rest (relative to the planet) from an altitude of one radius above the surface. When the object hits the surface of the planet (neglecting air resistance), its speed is 2 times what it would be if the same experiment were carried out for Earth. If M E is the mass of the Earth, the mass of the planet is: (1) 4 M E (2) 2 M E (3) 16 M E (4) 8 M E (5) 32 M E 15. The density of water is 1.0 g/cm 3 and oil does not mix with water. The density of the oil in the left column of the U-tube shown in the figure is: (1) 0.80 g/cm 3 (2) 0.20 g/cm 3 (3) 1.0 g/cm 3 (4) 1.3 g/cm 3 (5) 5.0 g/cm 3

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77777 77777 16. The sound intensity 5.0 m from an isotropically radiating point source is 0.50 W/m 2 . The power output of the source is: (1) 157 W (2) 39 W (3) 266 W (4) 320 W (5) 628 W 17. The figure shows four isotropic point sources of sound that are uni-
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