The work done by the conservative force F = -ka = -4x to move the block from a = -0.25 m to a = 0 is: W = 0 J W = -1 J O Option 2 O Option 1 W = -0.125 J W = 0.125 J O Option 3 O Option 4
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- A block of mass m = 2.0 kg is pushed a distance d = 4.0 m along a friction surface with coefficient of kinitik friction 0.20, horizontal table by a constant applied force of magnitude F = 25.0 N directed at an angle 0 = 20º below the horizontal as shown in Figure. Determine the work done on the block by: 1. The applied force. 2. The normal force exerted by the table. 3. The gravitational force. 4. The net force on the block. m dThe 15-kg bar is released from rest while in the position shown and its end rollers travel in the vertical-plane slot shown. If the speed of roller A is 3.23 m/s as it passes point C, determine the work done by friction on the system over this portion of the motion. The bar has a length 1 = 775 mm. Assume 8 = 34⁰ Answer: Utriction B C N-mA student pushes a 0.40 kg box up a 30° inclined plane at a constant speed of 1.2 m/s. The student performs 5.0 J of work and the block moves a distance s along the incline before he stops pushing the box. The frictional force acting on the box is 0.9ON. Determine the value of s. Ending position Starting 30° position O 1.16 m O 1.65 m O 1.75 m O 1.85 m O 1.04 m
- 0 Question 3 A block of mass m = 1 kg is sliding on a horizontal surface with initial velocity vo = 2 m/s. The block is brought to a stop by kinetic friction in a distance of 4 m. What is the work done by the force of friction acting on the block? 2J O-0.5 J O-2 J 08 J 0.5 J O-8 J 1 pts Question 4 1 pts2. A 5.2-kg box slides a distance of 16.0-m. If the coefficient of kinetic friction is 0.30, what is the work done by the frictio" 6 d x244.64 J ✓cci 6 ccilo 16 cci16 ceiz4