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Questions tagged [homework-and-exercises]

Applies to questions of primarily educational value - not only questions that arise from actual homework assignments, but any question where it is preferable to guide the asker to the answer rather than giving it away outright. Please READ THE GUIDANCE IN META before asking homework-like questions.

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Getting 2 different answers when finding spring constant $k$ when gravity is involved

OK, so I've been wracking my brain for the past hour trying to figure out how to calculate k in a problem like this: A mass of 10 kg is attached to a spring hanging from the ceiling. It is released,...
233 views

Representing dimensions in Dirac delta function results

The Dirac delta function can be defined as $$\delta(x)=\frac{1}{2\pi}\int_{-\infty}^\infty e^{itx}dt$$ From this we see that the dirac function has units of $x^{-1}$. How do we represent the units ...
235 views

Final velocities of a two point-masses in inelastic collision [duplicate]

Two particles of same mass in a 2D frame collide with known initial (i) velocities. I would like to know the final (f) velocities of them after the collision. As in any other collision, momentum is ...
1k views

Capacitors in parallel final potential difference

I was provided with the following problem. So I first calculated the total capacitance for (i), which was $$4.5 + 1.5 = 6.0 \mu F$$ Now part (ii) is the question i'm struggling at. I know that ...
63 views

Why does only one of the DC circuit power equations work for me here?

I know that $$P=IV=I^2R=\frac{V^2}{R}$$ I solved for the current using the loop rule $$I=.47$$ but to solve for the Power output of the 16V battery I could only find the power by finding the ...
155 views

972 views

Effective spring constant of springs in series [closed]

When we consider the analogy of a rod as a spring while considering the combination of rods for finding the stretch we do this- Let for any rod considered as a spring $$k=\frac{AY}{L}$$ If two rods ...
35 views