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Chapter 8: Q.14 (page 199)
A satellite orbiting the moon very near the surface has a period of min. What is free-fall acceleration on the surface of the moon?
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Space scientists have a large test chamber from which all the air can be evacuated and in which they can create a horizontal uniform electric field. The electric field exerts a constant horizontal force on a charged object. A charged projectile is launched with a speed of at an angle above the horizontal. It lands in front of the launcher. What is the magnitude of the electric force on the projectile?
A 100 g ball on a 60-cm-long string is swung in a vertical circle about a point 200 cm above the floor. The tension in the string when the ball is at the very bottom of the circle is 5.0 N. A
very sharp knife is suddenly inserted, as shown in FIGURE P8.56,to cut the string directly below the point of support. How far to the right of where the string was cut does the ball hit the floor?
A car takes a -radius unbanked curve at localid="1649866624550" .What is the size of the friction force on the car?
You can swing a ball on a string in a vertical circle if you swing it fast enough. But if you swing too slowly, the string goes slack as the ball nears the top. Explain why there鈥檚 a minimum speed to keep the ball moving in a circle.
Elm Street has a pronounced dip at the bottom of a steep hill before going back uphill on the other side. Your science teacher has asked everyone in the class to measure the radius of curvature of the dip. Some of your classmates are using surveying equipment, but you decide to base your measurement on what you鈥檝e learned in physics. To do so, you sit on a spring scale, drive through the dip at different speeds, and for each speed record the scale鈥檚 reading as you pass through the bottom of the dip. Your data are as follows:
Speed m/sec | Scale Reading N |
5 | 599 |
10 | 625 |
15 | 674 |
20 | 756 |
25 | 834 |
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