Recent content by hitspace

That is actually what I did previously - got 1.7 , and it turns out, it was calculator error. Thank you haruspex! With regards to this, I would be interested in the general approach. Does it have to do with torque? I haven't yet reviewed that, but I'm starting that chapter now.

No, no, you are absolutely right... though I am confused why it only works if we assume h2 = 0.

Thank you! That makes excellent sense.

Because the disk's rotational inertia will resist the acceleration you mean? Meaning acceleration would be less but unknown... which would be the roadblock to using kinematics? So if I did this the way of energy conservation, would it go like this? KE_rot_i + KE_i + Ug_i = KE_rot_f + KE_f +...

Thank you so much. I really appreciate the help. The solutions manual says this is the right answer, but I am curious. How would this work on an object with different dimensions for moment of inertia. This whole process we went through to solve this problem seems unique to this particular moment...

Do you mean in the sense that if I played around with some numbers for example.. D= M/V M = D(l^3) then an object 48x the dimensions would be D(48L)^3 = 48^3 M? If I plug it back into the equation I see how I would then get (48^5)(2.5J). Am I on the right track with this line of thinking?

Homework Statement If we multiply all the design dimensions of an object by a scaling factor (f), its volume and mass will be multiplied by f^3. a) By what factor will its moment of inertia be multiplied? b) IF a 1/48 scale model has rotational kinetic energy of 2.5 Joules, what will be the...

Homework Statement A frictionless pulley has the shape of a uniform solid disk of mass 2.50 kg and radius of .2 m. A 1.50 kg mass is attached to a very light wire that is wrapped around the rim of the pulley, and the system is released from rest. a) How far must the stone fall so that the...

Thanks for the insight. I appreciate you taking the time to help me out.

Thanks for the assistance. I'm still a bit confused. Are you saying that since the problem defined the 270 m/s velocity limit through the air as both components of velocity , tangential and otherwise, I need to account for both components? I have this inkling that it might help if you would...

Homework Statement You are asked to design an airplane propleller to turn at 2400 rpm. The forward airspeed of the plane is to be 75.0 m/s, and the speed of the tips of the propeller blades through the air must not exceed 270 m/s. What is the maximum radius the propeller can have? With this...

Hi everyone, I've been systematically working through the exercises in my first year college textbook and have come up confused over this particular problem. I have a solution manual but it solves this problem differently than I did, though comes up with a similar answer. I've included my...

i was doing some research on future methods of space flight when i noticed something called a reactionless drive . impulse if you will. http://jnaudin.free.fr/html/impdexp.htm i was wondering if what the info says has been confirmed and if so how it works .

so he shouldn't even bother testing this ? this friend of mine explained this amnesia of force by saying that is compensated by the huge difference of forces between magnets . he showed this in the equation upwardmagneticforce > downwardmagneticforce + gravity now i don't know whether...

so the advertised rating is not true at all ? i mean I've seen some of these magnets push up almost 100 pounds . they have warning signs on them . r u sure ? and magnets do have pull force ratings don't they ? (just remembered . if you ever saw mythbusters they used maybe 3 or 4 of these to...