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Results tagged with homework-and-exercises
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user 23651
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.
2
votes
Accepted
Energy of a cylinder rolling down a path
You're missing the rotational kinetic energy at the bottom, $\frac{1}{2}I \omega ^2$. The key word in the problem is, 'rolling without slipping'. Also remember the equation, $$v=r\omega$$ The cylinder …
- 1,760
0
votes
What are the forces acting between two air bubbles in water?
Here's how I look at it:
When you 'release' the air bubbles, they tend to rise due to the buoyant force, $\rho_wgv$. Thus, they are in motion relative to the static fluid. Assuming that the air bubbl …
- 1,760
1
vote
Accepted
Calculate vector forces on object being affected by wind
The wind does not impart a 'force' on the object. The object does not 'feel' the wind (as long as it's not in contact with the ground). What actually happens is that the object moves concurrently with …
- 1,760
1
vote
Which parameter determines how much the 'recoil' or force applied by an object hurts?
I don't think this is a force problem, but a momentum conservation/impulse problem. The first thing I do is notice that the 2 bullets are identical and fired with the same force, thus they have the sa …
- 1,760
2
votes
Friction on a conveyor belt
The block is accelerating at $1\frac{m}{s^2}$ up the incline, since it is stationary with respect to the conveyor belt. What force is causing the block to accelerate? It can't be the normal force (whi …
- 1,760
0
votes
3
answers
510
views
Photoelectric effect: according to classical physics?
This is a sample test question I've encountered twice in some practice chemistry finals. I'm a little bit confused about what it's asking.
You are conducting an experiment on the photoelectric ef …
- 1,760
1
vote
Potential energy during vertical fall
NOTE: This comment was too long so I'll make it an answer.
I would assume that the amount that the spring contracts is negligible compared to the distance that the mass has fallen.
But anyway, regar …
- 1,760
1
vote
Accepted
Mechanics question (a block on top of a block)
Because you are not pulling with the critical force, $6N$, then static friction $F_f<\mu m_1g$, where $\mu=0.2$.
The equations you get from Newton's second law are:
$$F-F_f=m_1a$$
$$F_f=m_2a$$
Subs …
- 1,760
1
vote
2
answers
5k
views
Collision between a photon and an electron
Looking through this AP Physics question, I was struck by how the 'collision' between a photon and electron looks so much like a macroscopic collision. Is this even physically possible?
Look at the l …
- 1,760
1
vote
Bouncing ball simulation computer science
The question title indicates a 'simulation', yet you state that you 'don't really care about time.' Your question does not need to be solved with a computer program - it's fairly straightforward to do …
- 1,760
0
votes
Solve for Initial Velocity of a projectile given Angle, Gravity, and Initial and Final posit...
Begin with equations of motion:
$$\Delta x=V\cos\theta*t$$
$$\Delta y=V\sin\theta*t-\frac{1}{2}gt^2$$
We have two unknowns $V,t$ and two equations.
From the first equation, we have:
$$t=\frac{\Delta …
- 1,760
5
votes
Accepted
Newtons Cannon ball problem
Newton's Law of Gravity + centripetal force:
$$F_g=\frac{GMm}{r^2}$$
$$F_c=m\frac{v^2}{r}$$
Combine them and solve for what you need (usually you're given $r$ and asked to solve for $v$).
Those equa …
- 1,760
4
votes
1
answer
127
views
Why doesn't this equation for orbital motion change with position in the orbit?
The question and answer are on pg.8-10 of this PDF:
At first, I went through it, thinking nothing of it. But then, I wondered: "What if we picked a final state in which the space junk was NOT at clos …
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