A 20-M Long String Is Tied to a 3

question 28

Multiple Choice

A 2.0-m long string is tied to a 3.0-kg rock and the rock is twirled around in a circle at a constant speed.The speed of the rock is such that the string makes an angle of 45 degrees with the horizontal.What is the speed of the rock?

• A)2.8 m/s
• B)4.0 m/s
• C)3.7 m/s
• D)4.4 m/s
• E)5.0 m/s

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