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Q.What tangential speed v must the bob have so that it moves in a horizontal circle with the string making an angle 20.0^circ with the vertical?

Q. The wheel of a sport car is suspended below the body of the car by a vertical spring with a spring constant 1.1 x 104 N/m. The mass of the wheel is 14 Kg and the diameter of the wheel is 61 cm. What is the frequency of up-and-down oscillations of the wheel? Regard the wheel as a mass on one end of a spring and regard the body of the car as a fixed support for the other end of the spring.

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