Recent content by Ruddie

Simple: - You will try to push yourself back presumably - Your seatbelt also pushes you back a little - Air resistance So - It does, you just don't notice it that much.

Ah I see, but this explains it all.. The OP formulated the answer incorrectly. The question is: a) Show that the Egrav is loses is about 37000 J This is simply done by filling in Egrav = mgh.. b) Show that the total Ek of the projectile and the counterweight is about 26000 J...

Okay, well this is strange indeed, I simply assumed the 37000 J was the answer from E = mgh, which it nearly is.. Sorry - but I believe the variables given are incorrect, or the answer is incorrect.

Well, if the counterweight had 37000 Joule of potential energy in the beginning, and then had 11000 J in the end.. how many energy did it lose? 37000-11000 = 26000 J I presume that's obvious? Now, this energy was given to something else, in this case - the object on the other side of the...

Don't worry that much, just thought I would remind you of it - Please don't feel guilty :P

Oh wait, I see what the issue is here.. They simply said: The energy that the counterweight gives to the projectile is 37000 J, however.. It actually has 11000 J left when the arm is at it's highest point, this means that it 'lost' 37000 - 11000 = 26000 J Which is the energy given to the...

Abhishekdas - you are aware that you are not supposed to simply give him the answer, right? Check out the sticky at the top.

Well, what about first checking out what the law actually is? "Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it." And, as some additional advice -the car is in fact 'pushing' the passenger.. And will stop pushing him...

Okay, so I took my calculator, and used it to calculate the answer instead.. This however, gave me a different answer: v = 40,5 m/s This still seems a bit high, and strangly I can't figure out what I did wrong. As a different approach, I tried calculating it without the distance (since this...

Okay, well since I am not certain if you are allowed to calculate it like this - I can not answer your question with certainty. If however, my previous assumptions were correct the energy received would be: Ekin = 37000/4 = 9250J

This is in fact, part of an assignment I am doing this now, and I am also not sure about this. I think you forgot about the fact that the arm of the counterweight is not the same as the arm of the projectile. Think about moment ( M1 = M2 // F1*r1 = F2*r2 )...

Homework Statement Hello, I have an issue regarding projectile trajectory. As an assigment we have made a trebuchet, which is basically a catapult with a sling attached to it. We have done some measurements with the trebuchet itself, and have actually achievement some (according to us)...