Net work done by the person = change in potential energy = 0
So the answer to this question is option number (A) 0.
8. A person moves a mass Exam 3 (cont.) S a mass m connected to a...
8. A person moves a mass Exam 3 (cont.) S a mass m connected to a massless ideal spring between the two positions shown in the diagramata agram at a constant velocity, starting at position A (t = +d), and ending af ition B -d), where represents the equilibrium position of the uilibrium position of the mass and spring ystem. What is the network done by the person in this process? 4 of 12 2kd 2kd Position A Position B...
9. Position B X=- d x =+d XBO hitudes.) Whe diagram come. A sensor on both ends. A A massless bridge of length L is supported on both ends. A car of unknown mass is one third of the way across the bridge. A sensor on the left end of the bridge shows that 4000 N. (The diagram correctly shows the directions of the forces, but not their magnitudes.) What magnitude of force does the sensor on the right end...
Exam 3 (cont.) 19. 8 of 12 Consider two carts of mass m and 4m, at rest on a frictionless, horizontal surface. Now suppose a horizontal force is exerted on each cart. The forces are constant, and they have the same magni- tude F, and the same direction. The force on m acts for 2 seconds and the force on 4m acts for 1 second. After the forces cease, the carts continue moving with constant velocity forever. Compare the momenta...