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Chapter 2: Q8P (page 82)
Question:A system is acted upon by two forces,and. What is the net force acting on the system?
Answer
The net force acting on the system is
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Question:A system is acted upon by two forces,NandN. What is the net force acting on the system?
In order to pull a sled across a level field at a constant velocity you have to exert a constant force. Doesn鈥檛 this violate Newton鈥檚 first and second laws of motion, which imply that no force is required to maintain a constant velocity? Explain this seeming contradiction.
A 0.7 kgblock of ice is sliding by you on a very slippery floor at ]As it goes by, you give it a kick perpendicular to its path. Your foot is in contact with the ice block for . The block eventually slides at an angle of from its original direction. The overhead view shown in Figure 2.54is approximately to scale. The arrow represents the average force your toe applies briefly to the block of ice. (a) Which of the possible paths shown in the diagram corresponds to the correct overhead view of the block鈥檚 path? (b) Which components of the block鈥檚 momentum are changed by the impulse applied by your foot? (Check all that apply. The diagram shows a top view, looking down on the xzplane.) (c) What is the unit vectorin the direction of the block鈥檚 momentum after the kick? (d) What is the x component of the block鈥檚 momentum after the kick? (e) Remember that . What is the magnitude of the block鈥檚 momentum after the kick? (f) Use your answers to the preceding questions to find the zcomponent of the block鈥檚 momentum after the kick (drawing a diagram is helpful). (g) What was the magnitude of the average force you applied to the block?
A thin diverging lens of focal length 25cm is placed 18cm to the right of a point source of blue light on the axis of the lens. Where is the image of the source? Is it a real or a virtual image? If you placed a sheet of paper at the location of the image, what would you see on the paper?
A certain ohmic resistor has a resistance of .A second resistor is made of the same material but is three times as long and has half the cross-sectional area. What is the resistance of the second resistor? What is the effective resistance of the two resistors in series?
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