7. 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's a minimum speed to keep the ball moving in a circle.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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7. 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's a minimum speed to keep the ball moving in a circle.
8. A curve in a road has a bank angle calculated and posted for 80 km/h. However, the
road is covered with ice, so you cautiously plan to drive slower than this limit. What
might happen to your car? Why?
9. Why do airplanes bank when they turn? How would you compute the banking angle
given the airspeed and radius of the turn? [Hint: Assume an aerodynamic "lift" force
acts perpendicular to the wings].
Transcribed Image Text:7. 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's a minimum speed to keep the ball moving in a circle. 8. A curve in a road has a bank angle calculated and posted for 80 km/h. However, the road is covered with ice, so you cautiously plan to drive slower than this limit. What might happen to your car? Why? 9. Why do airplanes bank when they turn? How would you compute the banking angle given the airspeed and radius of the turn? [Hint: Assume an aerodynamic "lift" force acts perpendicular to the wings].
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