Recent content by Arejang

Homework Statement You are given a sample of metal and asked to determine its specific heat. You weigh the sample and find that its weight is 30.0 N. You carefully add 1.30×10^4 J of heat energy to the sample and find that its temperature rises 20.0 degrees C. What is the sample's specific...

^_^; man I feel stupid now. Well, anyway thanks!

So in other words. What K initial and K final are is not important, because the change in kinetic energy is already given in the problem?

I did something, but I'm still not sure I understand it, but it seemed to work. If I assume K_{f} is 0, then I can set up the problem like so: K_{i}=\frac{1}{2}I(\omega_{i}^{2}-\omega_{f}^{2}) Solving for I, I get\frac{2K_{i}}{(\omega_{i}^{2}-\omega_{f}^{2})}=I Plug and chug and got .232...

[SOLVED] moment of inertia Homework Statement The flywheel of a gasoline engine is required to give up 750 J of kinetic energy while its angular velocity decreases from 870 rev/min to 410 rev/min. What moment of inertia is required? Homework Equations I=\frac{2K}{\omega^{2}} The...

So how would I be able to utilize a mass that's not given?

Bump! Can anyone help me please?

Homework Statement Two asteroids of equal mass in the asteroid belt between Mars and Jupiter collide with a glancing blow. Asteroid A, which was initially traveling at 40.0 m/s, is deflected 30.0\circ from its original direction, while asteroid B travels at 45.0 \circ to the original...

I plan on doing so when I see him tomorrow.

thanks, I'm going to go ahead and marked this solved for the time being. If I find anything else, I'll post it back up again. Thanks for all your help!

Sorry, this problem has been irking me to no end. Would the length of the string, 2m, play any part of this problem? That would be the only factor I could see that might alter the answer somewhat. But if that were the case, then I don't know how else to approach this problem.

I just guessed all the answers and the right one was 66.7 m/s...What the heck? O_o

Our assignments are given online and it grades it the instant you input an answer. In this case, the answers are given in multiple choice, so I'm usually cautious to choose an answer as the chances to get it right are obviously limited to the amount of choices available. But I did choose the 423...

How could you use centripetal force if the pendulum isn't moving in a circle?

[SOLVED] A Ballistic Pendulum Homework Statement A bullet of mass 0.01 kg moving horizontally strikes a block of wood of mass 1.5 kg which is suspended as a pendulum. The bullet lodges in the wood, and together they swing upward a distance of 0.40 m. What was the velocity of the bullet just...