A 0.30-kg mass attached to the end of a string swings in a vertical circle (R = 1.6 m), as shown. At an instant when ? = 50°, the tension in the string is 8.0 N. What is the magnitude of the resultant force on the mass at this instant?
A. 5.6 N
B. 6.0 N
C. 6.5 N
D. 5.1 N
E. 2.2 N
Answer: C
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