Recent content by austindubose

Homework Statement Consider a bar of aluminum which is 10 cm X ½ m X 20 m. If the bar undergoes a change in its temperature from 10° C to 20° C, determine the new dimensions of the bar. Homework Equations ΔL=αL0ΔT α=24x10-6 The Attempt at a Solution I understand how the formula...

Thank you! I knew it was something having to do with the tension. And I wasn't thinking of doing forces on both objects, more of just doing it as a whole.

Homework Statement Use Newton's 2nd Law, sum of torques, and kinematic equations to determine the angular speed of the spool shown in the figure below. Assume the string has a negligible mass, and it turns without slipping. Use g=10 m/s2 for acceleration due to gravity. Homework...

The sum of the torques, because there is no motion, will equal zero. Would it be correct to say the following...? ƩT=0 0=(150lb)(2ft)-(50lb)(1ft)+(F2)(3ft) F2=83.3lb

That would be the upward force of the board due to the torque at support 1, minus the force of the bolt holding the board to the support, correct?

Homework Statement Homework Equations ƩF = mA T=rxF The Attempt at a Solution Using sum of forces, I found: ƩF=mA 150lb + 50lb - F1 - F2 = 0 (calling the support on the right "1") ƩT1 = 0 But I'm a little confused on where to go from this point. Any advice?

Homework Statement A skier starts from rest at the top of a large hemispherical hill. Neglect friction and show that the skier will leave the hill becoming airborne at a distance of h=R/3 below the top of the hill. R is the radius of the hemispherical hill. Homework Equations...

Thank you very much! I appreciate the quick reply

Homework Statement Consider a year to be precisely 365 days. Determine the angular speed of the Earth about the sun. If the Earth's mean distance from the sun is 1.496x1011 meters and our orbit is circular, determine our orbital speed about the sun. Homework Equations ω=Δθ/T, where ω is...

Sorry for the late reply, but would this be the correct way to approach this?

I apologize for my multiple recent posts, but I'm having pre-exam stress, so even the simplest things seem nearly impossible. Haha.. Homework Statement Note that connection point between the bar and the cable is not a pulley. Homework Equations F=ma The Attempt at a Solution...

Can you elaborate a bit on that? I'm not completely familiar with that formula. We probably just use different variables because I don't recognize the J.

Homework Statement Values from previous problem: Pre-collision: v2kg=6m/s -->, v3kg=3m/s <-- Post-collision: v2kg=2m/s <--, v3kg=5.67m/s --> Collision time: 0.2 sec Homework Equations F=mA=m(Δv/Δt) The Attempt at a Solution My instinct to solve this was to use the pre-collision values to...

Thanks for the help! I looked in the textbook (there was an example problem that was exactly the same but done backwards and with different values) and they all lined up with your explanation of using the work-energy theorem, and it basically seemed to be the way I worked it at first. I guess...

And also, k=40N/m.