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Two blocks are connected by a very light string passing over a massless and frictionless pulley. Traveling at constant speed, the 20.0 N block moves 75.0 cm to the right and the 12.0 N block moves 75.0 cm downward. • How much work is done on the 12.0 N block by (i) gravity and (ii) the tension in the string? 20.0 N How much work is done on the 20.0 N block by (i) gravity, (ii) the tension in the string, (iii) friction, and (iv) the normal force? Find the total work done on each block. 12.0 N

Two blocks are connected by a very light string passing over a massless and frictionless pulley. Traveling at constant speed, the 20.0 N block moves 75.0 cm to the right and the 12.0 N block moves 75.0 cm downward. • How much work is done on the 12.0 N block by (i) gravity and (ii) the tension in the string? 20.0 N How much work is done on the 20.0 N block by (i) gravity, (ii) the tension in the string, (iii) friction, and (iv) the normal force? Find the total work done on each block. 12.0 N

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1. INSTRUCTIONS: - Show the 'free body diagrams' completely. - Show all equations obtained from the free body diagrams, and how equations are derived from the FBD. - Show all solutions completely. Two blocks are connected by a very light string passing over a massless and frictionless pulley. Traveling at constant speed, the 20.0 N block moves 75.0 cm to the right and the 12.0 N block moves 75.0 cm downward. • How much work is done on the 12.0 N block by (i) gravity and (ii) the tension in the string? How much work is done on the 20.0 N block by (i) gravity, (ii) the tension in the string, (iii) friction, and (iv) the normal force? Find the total work done on each block. A child applies a force parallel to the x-axis to a 10.0 kg sled moving on the frozen surface of a small pond. As the child controls the speed of the sled, the x-component of the force she applies varies with the x-coordinate of the sled as shown in Fig. Calculate the work done by when the sled moves (a) from x = F 0 to x = 8.0 m; (b) from x = 8.0 m to x = 12.0 m; (c) from x = 0 to 12.0 m. A soccer ball with mass 0.420 kg is initially moving with speed 2.00 m/s. A soccer player kicks the ball, exerting a constant force of magnitude 40.0 N in the same direction as the ball's motion. Over what distance must the player's foot be in contact with the ball to increase the ball's speed to 6.00 m/s? 20.0 N F, (N) 10 5 O 00 8 12.0 N 12 x (m)
Transcribed Image Text:1. INSTRUCTIONS: - Show the 'free body diagrams' completely. - Show all equations obtained from the free body diagrams, and how equations are derived from the FBD. - Show all solutions completely. Two blocks are connected by a very light string passing over a massless and frictionless pulley. Traveling at constant speed, the 20.0 N block moves 75.0 cm to the right and the 12.0 N block moves 75.0 cm downward. • How much work is done on the 12.0 N block by (i) gravity and (ii) the tension in the string? How much work is done on the 20.0 N block by (i) gravity, (ii) the tension in the string, (iii) friction, and (iv) the normal force? Find the total work done on each block. A child applies a force parallel to the x-axis to a 10.0 kg sled moving on the frozen surface of a small pond. As the child controls the speed of the sled, the x-component of the force she applies varies with the x-coordinate of the sled as shown in Fig. Calculate the work done by when the sled moves (a) from x = F 0 to x = 8.0 m; (b) from x = 8.0 m to x = 12.0 m; (c) from x = 0 to 12.0 m. A soccer ball with mass 0.420 kg is initially moving with speed 2.00 m/s. A soccer player kicks the ball, exerting a constant force of magnitude 40.0 N in the same direction as the ball's motion. Over what distance must the player's foot be in contact with the ball to increase the ball's speed to 6.00 m/s? 20.0 N F, (N) 10 5 O 00 8 12.0 N 12 x (m)
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