Recent content by Charlene

1.9(0^2) + 8.77(L^2) + 148(r_cm^2) r_cm=.822L therefore, 8.77L^2+121.656L^2 I=130.426L^2

So would the first equation i listed be able to be used if i used it for the x component and y component seperately, i cannot think of a way to "multiply it out" unless you just mean m1(v1f-v1i)=m2(v2i-v2f)??

I know I've got three masses but i thought since the third mass was at the center of mass that i wouldn't have to consider it when finding the center, why would this be a wrong assumption?

Okay so using equation MR=m1r1+m2r2 MR=0 + 8.77kg*L And then divide by the total mass So 1.90kg+8.77kg=10.67 kg So the center of mass is at .822L?

Homework Statement A massless rod of length L connects three iron masses. If the first mass (at x=0) has a mass of 1.90 kg and the second mass (at x=L) has a mass of 8.77 kg and the third mass (located at the center of mass of the system) has a mass of 148 kg, what is the moment of inertia I...

oh okay, i see that i need to include the angular acceleration. so i found this formula, 1/2*alpha*time^2 (.314 rad/sec^2)*(100 sec^2)*(.5)=15.7 rad *1rev/2pi rad = 2.50 revolutions

okay, would the equation m1(v1i^2)+m2(v2i^2)=m1(v1f^2)+m2(v2f^2) be accurate? I'm pretty sure the right hand side is correct but i may have messed up on the left hand side.

well all i did was use the conversion to convert rad to rev, i didn't use any type of formula, so perhaps i shouldn't be using the angular acceleration in part b? should i just take the 3.14 rad/sec and multiply it by the 10 secs to get 31.4 rad and then divide by 2pi to get around 5.00...

Homework Statement Consider a collision: If mass 1 has initial velocity 1i-1j of and mass 2 is initially at rest. After collision mass one moves with a velocity of 2i-3j and mass 2 moves with velocity of -1.5i+3j. What's m1/m2? Homework Equations m1/m2-=(v2f-v2i)/(v1i-v2f) The Attempt at a...

Homework Statement A fish starts at rest and uniformly accelerates. After 10 seconds, he is swimming around a rock at a rate of 3.14 rad/sec. a.) What's the magnitude of angular acceleration? b.) How many times did the fish circle the rock (how many revolutions?) Homework Equations a.)...

okay, that's what i thought, therefore i would want to use the range formula R=((44.72m/s)^2(sin(66.6))/9.8m/s^2 =187. because this will give the horizontal distance which is all this question is really wanting i think, because it doesn't tell me about how high the flare needs to be, just how...

Homework Statement You have been stranded on a deserted island. Fortunately, you managed to bring a flare gun. You can see a ship 300. m off shore. Unfortunately, because of the daylight the ship cannot see your flare unless it is within 100. m of the ship. A.) If you fire the flare gun from...

sorry I'm editing it now!

I asked one of my classmates for help on this problem and this is the solution he came up with. Isnt this incorrect tho because the range formula isn't keeping in mind that its not hitting the ground? I am honestly so lost and have an exam in a couple hours, hope to figure this out soon! okay...

This is the EXACT wording of the question i have, this is on an old exam my professor gave the class to study from (without solutions). Am i supposed to assume since the most tenstion will be halfway thru the swing that it'll be 90 degrees? But it doesn't say he's starting with the vine exactly...