Block A (mass 40 kg) and block B (mass 80 kg) are connected by a string of negligible mass as shown in the figure. The pulley is frictionless and has a negligible mass. If the coefficient of kinetic friction between block A and the incline is µ̟ = 0.26 and the blocks are released from rest, determine the change in the kinetic energy of block A as it moves from C to D, a distance of 19 m up the incline. 3.9 While this problem can be solved with the content from earlier chapters, you should solve this problem with work and energy content. In order to do this, see if you can you express the work done by nonconservative forces in terms of the change in kinetic and potential energy of the two blocks. Can you find an expression for the work done by the nonconservative forces? Can you find an expression for the change in kinetic energy of the two blocks? Can you find an expression for the change in gravitational potential energy for the two blocks? Can you find a relationship between the total change in kinetic energy and the change in kinetic energy of block A? J B A 37°

The Super Sled travels with an initial kinetic energy of 3369 J horizontally and to the right along a frictionless flat surface, initially at a height of zero (initial gravitational potential energy = 0). The driver briefly engages the rocket over a distance (Ax) of 2.000 m, pushing the sled with a force of 400.0 N over that distance. The rocket is then turned off. The sled then goes up an inclined surface with a rough surface. The coefficient of kinetic friction on the incline is uk. At the top of the incline, the sled reaches a height h = 1.500 m above the ground where the surface becomes flat and frictionless again. The sled (including the rocket and driver) has a total mass of 87.00 kg. (Notes: assume that g = 9.810 m/s² , and that the mass of fuel used by the rocket is negligible. Do not use scientific notation). After &, rocket rocket Before propulsion propulsion starts ends rough inclined surface rocket frictionless engaged coefficient of kinetic friction = H surface h = 1.500 m…

Two blocks, A and B (with mass 30 kg and 110 kg, respectively), are connected by a string, as shown in the figure below. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is u, = 0.21. Determine the change in the kinetic energy of block A as it moves from to 0 a distance of 24 m up the incline (and block B drops downward a distance of 24 m) if the system starts from rest. A 37°

A cord is used to vertically lower an initially stationary block of mass M = 4.9 kg at a constant downward acceleration of g/7. When the block has fallen a distance d = 2.4 m, find (a) the work done by the cord's force on the block, (b) the work done by the gravitational force on the block, (c) the kinetic energy of the block, and (d) the speed of the block. (Note : Take the downward direction positive) (a) Number Units (b) Number Units (c) Number Units (d) Number Units