Clicker Question. A. 1/9 the KE of block B. B. 1/3 the KE of block B.
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2 Block A on the left has mass 1.00 kg. Block B on the right has mass 3.00 kg. The blocks are forced together, compressing the spring. Then the system is released from rest on a level, frictionless surface. After the blocks are released, the kinetic energy (KE) of block A is A. 1/9 the KE of block B. B. 1/3 the KE of block B. D. 9 times the KE of block B. E. the same as the KE of block B. C. 3 times the KE of block B.
3 Block A on the left has mass 1.00 kg. Block B on the right has mass 3.00 kg. The blocks are forced together, compressing the spring. Then the system is released from rest on a level, frictionless surface. After the blocks are released, the kinetic energy (KE) of block A is A. 1/9 the KE of block B. B. 1/3 the KE of block B. D. 9 times the KE of block B. E. the same as the KE of block B. C. 3 times the KE of block B.
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6 Figure 8.31a
7 A yellow block and a red rod are joined together. Each object is of uniform density. The center of mass of the combined object is at the position shown by the black X. Which has the greater mass, the yellow block or the red rod? A. the yellow block B. the red rod C. they both have the same mass D. not enough information given to decide
8 A yellow block and a red rod are joined together. Each object is of uniform density. The center of mass of the combined object is at the position shown by the black X. Which has the greater mass, the yellow block or the red rod? A. the yellow block B. the red rod C. they both have the same mass D. not enough information given to decide
9 An open cart is rolling to the left on a horizontal surface. A package slides down a chute and lands in the cart. Which quantities have the same value just before and just after the package lands in the cart? A. the horizontal component of total momentum B. the vertical component of total momentum C. the total kinetic energy D. two of A., B., and C. E. all of A., B., and C.
10 An open cart is rolling to the left on a horizontal surface. A package slides down a chute and lands in the cart. Which quantities have the same value just before and just after the package lands in the cart? A. the horizontal component of total momentum B. the vertical component of total momentum C. the total kinetic energy D. two of A., B., and C. E. all of A., B., and C.
11 Two identical masses are released from rest in a smooth hemispherical bowl of radius R, from the positions shown in the figure. You can ignore friction between the masses and the surface of the bowl. If the blocks collide elastically, what is the subsequent motion? A. Both blocks slide up the right side to h = R 1 2 B. Block 2 slides up the right side to h=r, Block 1 slides back up the left side to h=r C. Block 2 slides up the right side to h=r/2, Block 1 slides back up the left side to h=r/2 D. Block 2 slides up the right side to h=r, Block 1 stays at the bottom of the bowl
12 Two identical masses are released from rest in a smooth hemispherical bowl of radius R, from the positions shown in the figure. You can ignore friction between the masses and the surface of the bowl. If the blocks collide elastically, what is the subsequent motion? A. Both blocks slide up the right side to h = R 1 2 B. Block 2 slides up the right side to h=r, Block 1 slides back up the left side to h=r C. Block 2 slides up the right side to h=r/2, Block 1 slides back up the left side to h=r/2 D. Block 2 slides up the right side to h=r, Block 1 stays at the bottom of the bowl
13 If they stick together when they collide, how high above the bottom of the bowl will the masses go after colliding? The magnitude of the momentum of the stuck-together blocks, when they reach their highest point, is: A. 0 B. mv i 1 C. mv i /2 2 D. 2mv i
14 If they stick together when they collide, how high above the bottom of the bowl will the masses go after colliding? The magnitude of the momentum of the stuck-together blocks, when they reach their highest point, is: A. 0 B. mv i 1 C. mv i /2 2 D. 2mv i
15 If they stick together when they collide, how high above the bottom of the bowl will the masses go after colliding? The magnitude of the momentum of the stuck-together blocks, when they reach their highest point, is: A. 0 B. mv i 1 C. mv i /2 2 D. 2mv i What happened to momentum conservation???
16 If they stick together when they collide, how high above the bottom of the bowl will the masses go after colliding? The magnitude of the momentum of the stuck-together blocks, when they reach their highest point, is: A. 0 B. mv i 1 C. mv i /2 2 D. 2mv i What happened to momentum conservation???
17 A 1.0-kg block and a 2.0-kg block are pressed together on a horizontal frictionless surface with a compressed spring between them. They are not attached to the spring. After they are released and have both moved free of the spring: A. Both blocks will both have the same amount of kinetic energy. B. The heavier block will have more kinetic energy than the lighter block. C. The magnitude of the momentum of the heavier block will be greater than the magnitude of the momentum of the lighter block. D. The lighter block will have more kinetic energy than the heavier block. E. Both blocks will have equal speeds.
18 A 1.0-kg block and a 2.0-kg block are pressed together on a horizontal frictionless surface with a compressed spring between them. They are not attached to the spring. After they are released and have both moved free of the spring: A. Both blocks will both have the same amount of kinetic energy. B. The heavier block will have more kinetic energy than the lighter block. C. The magnitude of the momentum of the heavier block will be greater than the magnitude of the momentum of the lighter block. D. The lighter block will have more kinetic energy than the heavier block. E. Both blocks will have equal speeds.
19 Determine the character of the collision above. The masses of the blocks, and the velocities before and after are given. The collision is: A. completely inelastic B. perfectly elastic C. partially inelastic D. characterized by an increase in kinetic energy E. not possible because momentum is not conserved.
20 Determine the character of the collision above. The masses of the blocks, and the velocities before and after are given. The collision is: A. completely inelastic B. perfectly elastic C. partially inelastic D. characterized by an increase in kinetic energy E. not possible because momentum is not conserved.
21 Ball A, of mass 3.0 kg, is attached to a 0.4-m light rod, freely pivoted at P. Ball B is suspended from Q by a 0.6-m rope and is at rest. Ball A descends, and has a speed v1 = 3.6 m/s at the bottom, prior to striking ball B. The speed of balls A and B after the collision are v2 = 1.1 m/s and v3 = 2.3 m/s, as shown. In Fig. 8.6, the mass of ball B is closest to: A. 5.4 kg B. 3.8 kg C. 6.1 kg D. 4.6 kg E. 3.1 kg
22 Ball A, of mass 3.0 kg, is attached to a 0.4-m light rod, freely pivoted at P. Ball B is suspended from Q by a 0.6-m rope and is at rest. Ball A descends, and has a speed v1 = 3.6 m/s at the bottom, prior to striking ball B. The speed of balls A and B after the collision are v2 = 1.1 m/s and v3 = 2.3 m/s, as shown. In Fig. 8.6, the mass of ball B is closest to: A. 5.4 kg B. 3.8 kg C. 6.1 kg D. 4.6 kg E. 3.1 kg
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