Recent content by ustudent

I have (conceptual) questions about this question posted before: https://www.physicsforums.com/showthread.php?t=386071 On the second part of the question (part B: The switch is opened at t = 0s. At what time has the charge on the capacitor decreased to 12% of its initial value?), why does...

That's good advice. Thanks for all the help!

Ah, I see what you mean. If with the block and bullet the spring is allowed to rest, the new equilibrium position will be different. Correct? Boy, that's a tricky problem. I see why he did what he did now; for a second I was going crazy and I thought the problem contradicted everything I knew...

OK. What bothered me is that my professor did a review question where you have a block hanging from a vertical spring and a bullet is fired into the block from the bottom up. The question asked "What is the maximum displacement of the spring?" Of course, you use conservation of momentum just...

Does that also mean that E = (1/2)m(Vmax)^2?

I have a few questions regarding vertical oscillations (not damped). Let's say you have a spring hanging from a ceiling with a mass attached to it. So, for example, if I had a mass attached to a spring and I pulled it down by 10 meters, if mg/k = 5 meters then the amplitude would be 5 meters...

Let's say I had a disk sitting at rest and I threw a ball of clay toward the edge of the disk, causing the clay to stick to the disc and having both rotate as a result. If the wheel's axle had friction and would eventually slow the disc down, can you still say that angular momentum is conserved...

Ah, okay. Thanks for clarifying that for me.

Sorry, I should've clarified that I would want the distance between the Earth and the Moon to include their center of masses (I don't want the distance simply between the surfaces). So the equation above for r does incorporate the center of masses, then (as in, to the question I posed above, my...

Let's say I wanted to calculate the distance between the Earth and the Moon (assuming that the system in question only includes the Earth and Moon, the Earth remains stationary**, and the Moon undergoes a circular orbit around the Earth and thus acts as a satellite). The relevant equation is: r...