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Results tagged with homework-and-exercises
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user 62726
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
Depth of a well
By the time you're putting this much effort into a problem, you should solve it algebraically, then plug in your values at the end. That allows you to sanity-check your answer by finding the limiting …
- 7,595
1
vote
Accepted
How does one calculate how big something has to be, to be seen at a given distance?
Let $w$ be the actual size of the object, $d$ be the distance to the object, $w_r$ be the size of a reference object, and $d_r$ be the distance to the reference object.
If you want your object to app …
- 7,595
3
votes
Accepted
Mass required to prevent sign falling over with a set wind load - activity stations for disa...
Assuming a square base of width $w$ with mass $M$, and a horizontal wind load $F_w$ at a height $h$, then the condition for static equilibrium is
$$\sum\tau = 0$$
$$\tau_{wind} + \tau_{base} = 0$$
S …
- 7,595
2
votes
Accepted
The Strength of the Tangential and Radial Components of a Dipole Magnetic Field
The simplest way to see why $B_\theta = \frac{1}{r}\frac{\partial W}{\partial \theta}$ and not $B_\theta = \frac{\partial W}{\partial \theta}$ is to imagine what a differential element of length looks …
- 7,595
2
votes
Accepted
The equivalent resistance betweeen A and B. I need the answer with proper explaination
You have two basic options:
Realize that this is actually just two resistors in series with three parallel resistors, and analyze it using the equivalent resistances of resistors in parallel and ser …
- 7,595
2
votes
Accepted
Motion of Particle due to Lorentz Force
You've taken a wrong turn with the cross product business. A cross product is a vector operation - it maps two vectors to a third vector. However, you seem to be imagining that your three equations fo …
- 7,595
2
votes
Accepted
Free falling body's deceleration
I think you're mentally confusing "acceleration" and "force.
I think your thought process is "If I'm going to apply an acceleration to an object, that acceleration will be fighting against the accele …
- 7,595
1
vote
Would a non-conducting body ever acquire a uniform static charge throughout it's volume?
An electret is a insulating material that has been imbued with a semipermanent volume charge distribution by bombarding it with charged particles. I don't know how uniform the charge distribution gen …
- 7,595
0
votes
What should the length of my wire be in order to get a surface area of 10cm^2?
The key idea here is that the volume of the wire before and after flattening it should be almost exactly the same, since you aren't removing or adding any metal, just smushing it around.
If $L$ is th …
- 7,595
3
votes
Accepted
What happens with an originial force if a part of it creates a torque?
The force doesn't get "used up" by creating a torque. The torque and the force exist simultaneously.
You correctly computed the torque due to that force. If that is the only force on this object, t …
- 7,595
1
vote
mechanics problem: rope on a fictionless table through a hole
I think the author has forgotten to mention that the part of the rope on the table is stretched out in a straight line, otherwise, I would say the way it's piled does make a difference, and the proble …
- 7,595
1
vote
Accepted
Decreased velocity away from gravity
You need Newton's law of universal gravitation and Newton's 2nd law:
$$\vec{F_g} = G \frac{M m}{r^2} \hat{r}$$
$$\vec{F_{net}} = m \frac{d\vec{v}}{dt}$$
Here, $M$ is the mass of particle G, $m$ is th …
- 7,595
2
votes
How much force can bolt cutters exert?
This depends on the design and measurements of the bolt cutters. Some bolt cutters have a single fulcrum, some have two.
If you have a one-fulcrum bolt cutter, then you have a pair of first-class le …
- 7,595
3
votes
Accepted
Determining a temperature increase from heat energy
Q is the heat gained by the water. In this problem, the thermal energy gained by the water must come from the kinetic energy the bullet lost in the water.
Find the kinetic energy lost by the bullet, …
- 7,595
0
votes
The storage of kinetic energy in a flywhell?
The kinetic energy of a flywheel is given by
$$T = \frac{1}{2} I \omega^2$$
Where $I$ is the moment of inertia and $\omega$ is the angular speed. The specific kinetic energy (KE per kilogram) is
…
- 7,595