Recent content by dominus96

Homework Statement In 1956, Frank Lloyd Wright proposed the construction of a mile-high building in Chicago. Suppose the building had been constructed. Ignoring Earth's rotation, find the change in your weight if you were to ride an elevator from the street level, where you weigh 520 N, to the...

Wait, i think I get it. So do you do MR2/3 + MR2? The inertia of the rod is 0, so the answer is just MR2? That would be 1.0115, am I right?

Not quite sure what you mean. There is one rod and it has a mass attached to it, so don't you just use that as the mass in the inertia equation?

Come on, SOMEBODY has to know this =/

Easy question that I'm not getting?? Homework Statement A small ball with mass 1.40 kg is mounted on one end of a rod 0.850 m long and of negligible mass. The system rotates in a horizontal circle about the other end of the rod at 5020 rev/min. Calculate the rotational inertia of the...

bump can someone help me?

Homework Statement An amusement park ride consists of a rotating cylinder with rough canvas walls. The rider enters the cylinder and stands on the floor as the cylinder starts spinning, and as it spins, the floor lowers but the rider stays against the wall and does not slide down with it...

Alright I got 96 as the initial velocity, and 0 as the velocity after 4 seconds. Are those right?

Homework Statement A ball is tossed up in the air from the top of a tower. The function for this is y = -16t2 + 64t + 80. The problems are: a) What is the velocity of the ball after 4 seconds? b) What was the initial velocity that the ball was tossed? c) When will the ball reach its...

Thank you very much tiny-tim. If you don't mind, I have one more similar problem that is also written in a way I don't understand. Here it is: Find f' for f(x) = 11x - 2. Is f' (f prime) basically the first derivative again, or different?

Homework Statement Dx(7x+2-3x5) Homework Equations CNXN-1? The Attempt at a Solution Basically, I am in Physics C and this is our first homework assignment dealing with calculus/derivatives. I was able to do some of them, but I have no idea how to do this one, mainly because I don't know...

Homework Statement A man pushes an 80 N crate a distance of 5.0 m upward along a frictionless slope that makes an angle of 30° with the horizontal. The force he exerts is parallel to the slope. If the speed of the crate is constant, then the work done by the man is: a) 61 J b) 200 J c)...

Ok but c) wouldn't be true right?

The one on the moon stays in the air longer because of the much lower gravity, so does that mean both a) and b) are true?

Homework Statement Identical guns fire identical bullets horizontally at the same speed from the same height above level planes, one on the Earth and one on the Moon. Which of the following three statements is/are true? a) The flight time is less for the bullet on the Earth. b) The...