Vertical Circles/Work-related Physics

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To determine the resultant force on a 0.30 kg mass swinging in a vertical circle with a radius of 1.6 m at a 50-degree angle, the tension of 8.0 N must be combined with gravitational force components. For the 4 kg block on a 37-degree incline, the work done by friction can be calculated by analyzing the change in kinetic energy and the work done by the applied force. The free body diagram for the rock swinging in a horizontal position should include tension, gravitational force, and centripetal force components. Accurate calculations and clear diagrams are essential for resolving these physics problems. Providing detailed work is necessary to receive assistance in solving these scenarios.
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What formula do i apply to the following/theories?

(1) a 0.30 kg mass attached to the end of a string swings in a vertical circle (R=1.6m). At an instant when theta=50 degrees, the tension in the string is 8.0N. what is the magnitude of the resultant force on the mass at this instant?

(2) a 4kg block is lowered down a 37 degree incline a distance of 5m from point A to point B. A horizontal force (F=10N) is applied to the block between A and B. the kinetic energy of the block at A is 10J and at B is 20J. How much work is done on the block by the force of friction between A and B?

(3)A rock attached to a string swings in a vertical circle. Which free body diagram could correctly describe the force(s) on the rock when the string is in one possible horizontal position?

**DIAGRAMS ARE ATTACHED** for all of the above questions.
 

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