A 40-Kg Mass Attached to the End of a String Swings

question 20

Multiple Choice

A 4.0-kg mass attached to the end of a string swings in a vertical circle of radius 2.0 m. When the string makes an angle of 35° with the vertical as shown, the speed of the mass is 5.0 m/s. At this instant what is the magnitude of the force the string exerts on the mass?

• A)50 N
• B)82 N
• C)89 N
• D)11 N
• E)61 N

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