Casch 0 #1 November 8, 2002 Ok, I have a pretty simple physics test on trajectory motion. I am almost 100% confident that I will ace the test but I was hoping maybe someone could give me a problem to solve. I think the problems will be something like this: Billy shoots a rock from his sling shot at 72m/s at a 43 degree angle. What is the time of flight, what is the max height that the rock will reach and how far horizontally will it fly? -------------------------------------------------------- Edited to add: Time of Flight: 10 s Max Height: 123 m Horizontal Distance: 526.6 M Am I right???? -------------------------------------------------------- drag and such will not be factored into the problem...I haven't learned how to do that yet. Come on guys! Gimme a hard Q! Quote Share this post Link to post Share on other sites
cgross 1 #2 November 8, 2002 Taking into consider the coriolus force, but no drag. At a lattitude of 42 degrees north. A bullet is fired at 1000 feet per second. If it were to continue at that speed, How far would the bullet deviate north as it traveled to Chicago. Given: Assume boston and Chicago are both at 42 degrees north. Distance between them is 900 miles. Quote Share this post Link to post Share on other sites
Casch 0 #3 November 8, 2002 um...maybe not that hard... Quote Share this post Link to post Share on other sites
cgross 1 #4 November 8, 2002 i was just giving you a hard time. good luck. Quote Share this post Link to post Share on other sites
QuickDraw 0 #5 November 8, 2002 Quote drag and such will not be factored into the problem Such = Gravity/mass of rock ? -- Hope you don't die. -- I'm fucking winning Quote Share this post Link to post Share on other sites
Galen 0 #6 November 8, 2002 I let you in on a little secret. You never do learn how to factor in air resistance. Unless, perhaps you get into a specific discipline that deals with aerodynamics. So, I get to keep living in my perfect Newtonian world. Respect the Dolphin Quote Share this post Link to post Share on other sites
cgross 1 #7 November 8, 2002 i do know how to factor in air resistance, and let me tell you it is not worth the knowledge. A couple classes in college called: Geophysical Fluid dynamics I & II Not a cool class Quote Share this post Link to post Share on other sites
wmw999 2,587 #8 November 8, 2002 Billy shoots a rock from his sling shot at 72m/s at a 43 degree angle. What is the time of flight, what is the max height that the rock will reach and how far horizontally will it fly? Billy is standing on top of a tree, 15 feet off the ground when he shoots the slingshot. The rock is actually a large round marble. After you figure out where the marble lands, place a 15 degree hill where it lands, with 10 feet left of rolling-down room, followed by flat land. How fast is it going when it's done rolling down the hill, and how far does it go onto the flat (again not taking friction etc. into account). My high school physics professor was sick... Wendy W.There is nothing more dangerous than breaking a basic safety rule and getting away with it. It removes fear of the consequences and builds false confidence. (tbrown) Quote Share this post Link to post Share on other sites
cgross 1 #9 November 8, 2002 if that was high school... i would have dropped out Quote Share this post Link to post Share on other sites
QuickDraw 0 #10 November 8, 2002 Quote Max Height: 123 m Horizontal Distance: 526.6 M Does billy wanna sell that sling-shot ? -- Hope you don't die. -- I'm fucking winning Quote Share this post Link to post Share on other sites
Casch 0 #11 November 8, 2002 LOL yeah no kiddin, hate to get hit with that rock. And Wendy...I am just glad I don't have your teacher... Quote Share this post Link to post Share on other sites
Cornholio 0 #12 November 8, 2002 Quote How fast is it going when it's done rolling down the hill, and how far does it go onto the flat (again not taking friction etc. into account). Velocity = 6 m/s Travel = 98 m Is that close ?? Butthead: Whoa! Burritos for breakfast! Beavis: Yeah! Yeah! Cool! bellyflier on the dz.com hybrid record jump Quote Share this post Link to post Share on other sites
Chivo 0 #13 November 8, 2002 One I used to like was the classic "shoot the monkey" problem... Problem: A hunter fires a dart gun with a harmless sedative at a monkey hanging from a vine a distance h vertically above the dart gun and a distance R horizontally away from the dart gun. The hunter aims directly at the monkey and fires, but just as the hunter fires, the monkey, using its incredible spider-monkey sense, realizes what's up and drops from the vine. Does the monkey avoid the dart? Enjoy. ~Chivo Quote Share this post Link to post Share on other sites
Sonic 0 #14 November 8, 2002 Quotehow far does it go onto the flat (again not taking friction etc. into account) In that case, it would keep rolling forever.----------------------------------- It's like something out of that twilighty show about that zone Quote Share this post Link to post Share on other sites
cgross 1 #15 November 8, 2002 of course he does! I mean if he truely has "incredible spider monkey sense" Right? Quote Share this post Link to post Share on other sites
kevin922 0 #16 November 8, 2002 two trains leave the station at the same time travelling in opposite directions................. heheh boy i loved problems like that.. (NOT!) Quote Share this post Link to post Share on other sites
happythoughts 0 #17 November 8, 2002 Quote Quote Max Height: 123 m Horizontal Distance: 526.6 M Does billy wanna sell that sling-shot ? They are for sale. A trebuchet is kind of a slingshot anyway. Rotational velocity or some crap. Trebuchet I think they are cool and if I didn't live in an apt, I would build one, just to fling stuff. Quote Share this post Link to post Share on other sites
wmw999 2,587 #18 November 8, 2002 QuoteIn that case, it would keep rolling forever. You're absolutely right. Surprising the things you forget about in 30 years... I don't remember any more what we were supposed to ignore, but yes, we did have problems like this. He'd walk us through them over the period of a couple of days. That's what you get for having a hs physics prof who's doing it as a sideline to his university physics professor job... Wendy W.There is nothing more dangerous than breaking a basic safety rule and getting away with it. It removes fear of the consequences and builds false confidence. (tbrown) Quote Share this post Link to post Share on other sites
Casch 0 #19 November 8, 2002 Unless the hunters dart gun is like my 4yo nephews dart gun, then the dart absolutely has to hit the monkey... Quote Share this post Link to post Share on other sites
pilotdave 0 #20 November 8, 2002 QuoteI let you in on a little secret. You never do learn how to factor in air resistance. Unless, perhaps you get into a specific discipline that deals with aerodynamics. So, I get to keep living in my perfect Newtonian world. Hehe, yeah, I'm in aerospace engineering. Today I had a class on aileron reversal at high speed due to wing twist. In another class we've been studying supersonic engine inlets, and in a 3rd today we started learning how to calculate the total parasite drag on a plane. And yet, I never did have to go back and solve for the trajectory of the rock when you account for air resistance. I did have to model a pendulum swinging with air resistance once though and create an animation of it. I MISS NEWTON! Dave Quote Share this post Link to post Share on other sites
freebird 0 #21 November 8, 2002 I feel for ya . I have Mid -terms in mircobiology and an anatomy class. plus the wonderful labs that go with the classesGood luck, think positive Quote Share this post Link to post Share on other sites
jtval 0 #22 November 8, 2002 Quotetwo trains leave the station at the same time travelling in opposite directions................. heheh boy i loved problems like that.. (NOT!) if billy is on one and his wife is on the other. who is going to get blamed for her getitng on the worng train? physics is SOOO easyMy photos My Videos Quote Share this post Link to post Share on other sites
kallend 2,146 #23 November 8, 2002 Sorry, I'm a physics professor. It would be unethical for me to help (especially since your tuition doesn't pay my salary). Quote Share this post Link to post Share on other sites
Sonic 0 #24 November 8, 2002 Quote I'm a physics professor. It would be unethical for me to help Yep, that's a physics teacher alright !! ----------------------------------- It's like something out of that twilighty show about that zone Quote Share this post Link to post Share on other sites
hagar 0 #25 November 8, 2002 A rock impact the ground. Its speed is 50 m/s. Give me the two ways the rock could have been thrown when the trebuchet is 100 meters away.--- PCSS #10 Quote Share this post Link to post Share on other sites
