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Physics Problem on Potential and Kinetic Energy...?

I think this is how you solve it w = integral of f dx You can find the integration limits based on how far the chain falls If only the 1.2m section of the chain moved, this would be easy. Since sections of the chain on the table move less than the sections dangling, write the amount a "small" section has moved vertically as a function of how far it is from the top, (the end of the table section). (ie, a section at 1m from the top only moves 1m, while the very top moves 0) - No work is done to it while its on the table since the force is perpendicular to the direction of motion. Because the force is constant, multiply the expression for distance moved by the weight density, and integrate. If you dont know calculus, you can plot the graph of the function and find the area under the curve between the start at the distance moved when the chain falls off.

1. Why is a 3-PDA no more powerful than a 2-PDA?

Two stacks can emulate a Turing machine tape. Motion along the tape is isomorphic to popping some symbol \$x\$ from one stack and pushing it onto the other stack. Writing to the tape is isomorphic to popping something from one stack and writing the new thing to that stack. Thus, anything a one tape Turing machine can do, a 2-PDA can do. Since a Turing machine can simulate a \$k\$-PDA for finite \$k\$, it can certainly simulate a 3-PDA. Therefore a 2-PDA is just as computationally powerful as a 3-PDA.

2. Is the equation of motion true for a non-uniform motion?

A motion is said to be non uniform if it has an acceleration . If whatever is the acceleration then in such kind of nonuniformity motion equations of motion are valid but if in non uniform motion acceleration is not changing then it differential equation will be valid

3. Should you strength train with resistance bands or dumbbells?

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