Extra Practice 11.2, 12.1 SOLUTIONS.pdf - Physics 621A \u2013 Extra Practice Sections 11.2 12.1 1 A runner moving at a speed of 8.8 m\/s rounds a bend in

# Extra Practice 11.2, 12.1 SOLUTIONS.pdf - Physics 621A –...

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Physics 621A Extra Practice Sections 11.2, 12.1 1. A runner moving at a speed of 8.8 m/s rounds a bend in the track with a radius of curvature of 25 m. a. Calculate the centripetal acceleration of the runner. 3.1 𝑚/? 2 b. What force supplies the centripetal force to give this acceleration to the runner? friction 2. A 40.0 g stone is whirled in a horizontal circle on the end of a 60.0 cm string at a speed of 2.2 m/s. Calculate the tension in the string. 0.32 N 3. A yo-yo with a mass of 255 g is twirled at a constant speed of 2.5 m/s in a vertical circle on a string with a length of 34.5 cm a. Calculate the tension in the string at the top of the revolution. 2.1 N b. Calculate the tension in the string at the bottom of the revolution. 7.1 N c. Calculate the maximum speed the yo-yo can have if the string will break when the tension reaches 22.4 N. 5.2 m/s 4. The Moon orbits the Earth with a period of approximately 27.3 days. If the distance from Earth to the Moon is 3.8 × 10 5 m, a. Calculate the magnitude of the Moon s centripetal acceleration.

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• Spring '20
• Rotation, 1.4 m, 1.9 M, 5.2 m

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