Recent content by rolodexx

[SOLVED] Partial Inelastic Collision Is it ok if I keep this here for my own reference (and others if it helps them)? I don't know why it helps to type everything out before I realize what I did wrong! But looking back on my work seems to reinforce what I learned. Homework Statement As...

The assumption I was relying on was initial velocity is 0... since there were no values aside from initial compression that could be used to get velocity. Is this a correct assumption? Because with a zero velocity, initial kinetic energy is also 0, so that would leave me with final kinetic...

OH! I feel stupid now... lol. I'll try that and see if I can make my problem work! Thanks.

v_{f2} = mv_{i}^{2} + k_{i}x_{i}^{2} - k_{f}x_{f}^{2} I used the conservation of energy rule to set the initial and final kinetic energy and elastic potential energy equal to each other, then tried to solve for final kinetic energy by subtracting both sides by final elastic potential energy...

[SOLVED] Maximum speed of object between 2 springs Homework Statement A 1.50 kg box moves back and forth on a horizontal frictionless surface between two different springs, as shown in the accompanying figure. The box is initially pressed against the stronger spring, compressing it 4.00 cm...

Thanks for the help! I can tell getting this is going to take some practice... :blushing:

hmm, I got it... lucky break, I guess. I found a unit conversion somewhere online that listed 1 kWh as 3.6 * 10^{6} J... so I used what I had made in kJ and changed it back to J, and divided it by the 10^{6} conversion, and it was right! But I still don't understand how the assumption of power...

If kJ is a unit of energy, how do I get it back to power when I already used up the time portion of the unit by multiplying by 4 hr?

What is dimensional analysis? Also, I already considered that I needed hours, so since a Watt is a unit in seconds I multipled by 60 s/min and 60 min/hr to get the right time unit... and I divided the Watt term by 1000 because of how my equation was set up.

SOLVED - Horsepower to kilowatt-hours? Homework Statement In the English system of units, power is expressed as horsepower (hp) instead of watts, where 1 hp=746 W. Horsepower is often used for motors and automobiles. How many kilowatt-hours of energy is produced when you run a 23.0 hp motor...

oh! Thank you so much... it definitely helps to "talk" to someone about this instead of just giving up. :smile:

The course I'm in is *supposed* to be algebra and trig-based, but I am quickly learning that using calculus would make my life a lot simpler, if I only remembered how to do that stuff. We also haven't studied elastic potential energy yet... I looked on Wikipedia and it said this was found by...

[SOLVED] Springs and Hooke's law Homework Statement An unstretched spring has a force constant of 1200 N/m. How large a force and how much work are required to stretch the spring by 1.00 m from its unstretched length? Homework Equations F= -k*s W= F * s The Attempt at a Solution...

they use both attractive & repulsive forces to dictate how close molecules can be if they are nearby... they were one of the primary methods Watson and Crick used to deduce the structure of DNA! I'd say that's an important role.