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Yep.
2. Finding how long a collision lasts

Oh, duh. Thanks.
3. Finding how long a collision lasts

Wouldn't it have only traveled .67 m?
4. Finding how long a collision lasts

Homework Statement In a crash test, a truck with mass 2000 kg traveling at 23 m/s smashes head-on into a concrete wall without rebounding. The front end crumples so much that the truck is 0.67 m shorter than before. Homework Equations About how long does the collision last? (That is, how long...
5. Forces with Tension and pulleys

Thanks for the help! The only thing I screwed up was the first part. It was 356N. For some reason I divided it by 4, but everything else was right.
6. Forces with Tension and pulleys

And for the last part I am a little stumped. The additional force would be to the right, but I can not figure out how to actually show that.
7. Forces with Tension and pulleys

Oh, so for 1) the Tension should just be 89N each. And then for 3) the u_k = Tension in E/ mg.
8. Forces with Tension and pulleys

Homework Statement I had a set of old concrete steps, with a mass of about 2.5 metric tonnes (i.e., 2500 kg), which needed to be dragged across the yard. One way to make the job easier was to rig a block-and-tackle, which consisted of two pulleys. I used a thick rope to tie one pulley to the...