A block having mass m travels along a horizontal frictionless surface with velocity vx. What impulse must be delivered to the block to reverse its direction?
1.–2mvx
2.–mvx
3.0
4.mvx
5.2mvx
6.None of the above
7.Cannot be determined
1,2,7
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Superposition of waves can produce
A) reinforcement. B) cancellation. C) partial cancellation. D) all the above
A neutron in a nuclear reactor makes an elastic head-on collision with a carbon atom initially at rest. (The mass of the carbon atom is 12 times that of the neutron.) What fraction of the neutron's original kinetic energy is retained by the neutron?
a. 14.4% c. 41.4% b. 28.4% d. 71.6%
When an artery gets a constricted region due to plaque, how does the pressure in this region compare to the pressure in an unconstricted region adjacent?
a. Since this is a closed system, the pressure is the same in both regions. b. In the constricted region the blood moves at a higher speed than in the unconstricted region, resulting in an increased pressure. c. In the constricted region the blood moves at a higher speed than in the unconstricted region, resulting in a decreased pressure. d. In the constricted region the blood moves at a lower speed than in the unconstricted region, resulting in an increased pressure.
What is the force of gravity on a 500-N woman standing on Earth's surface?
A) 50 N B) 250 N C) 500 N D) 598 N E) 5000 N