I took statistics in university about two years ago, but I'm rusty. I was trying to write a zero player game - except sometimes, the player can control one of the characters, and I needed to be able to compute these probabilities. That said, I almost put this in homework help, but it is not...
KVL I understand (or at least I think I do. However, I can't seem to identify whether the voltage drops or rises across a resistor. (Sorry that I may have worded that poorly, I've been up for 22 hours.)
Homework Statement
I was reading in my physics book about loop currents. However, some resistors are added to the result (R*I) whereas some resistors are subtracted from the result -(R*I). The book uses the phrase "uphill" and "downhill" to describe this, and, indeed, the so called "uphill"...
Allright, clarified question... let's saw we have $$\alpha=50\sqrt{\omega}$$. This is, I believe, equivalent to the diffyQ $$y''=50\sqrt{y'}$$. The book solves the equation by taking from $$dw/dt=a $$ $$ dt=dw/a$$, and integrating with bounds that are suggested by the problem. Wolframalpha...
Homework Statement
This is not a particular problem but a generic one. If one has acceleration stated in terms of velocity (or position) such as a=v, how do we convert these values into time?
Homework Equations
ads=vdv
ad(theta)=wdw
And of course, the usual time-based derivative relations...
I'll give you a screenshot if you want!
The book defined alpha (angular acceleration, I take it) merely as $$\frac{dw}{d\theta}$$. Then is also says that $$\alpha d\theta = \omega d\omega$$.
The exact answer has the line in it:
$$\alpha=\omega \frac{d\omega}{d\theta}$$ and using the given...
Homework Statement
"The flywheel rotates with angular velocity of w=0.005theta^2 rad/s. Determine the angular acceleration after it has rotated 20 revolutions.
Homework Equations
I thought the equations were all but self-evident using the problem description! (See below.)
alpha=dw/dt
The...
Homework Statement
Let me just put this here:
http://i.imgur.com/dgcWAC3.png
.
Homework Equations
E_flux=EA=(q_encl)/(permittivity)
Area=4pir^2
The Attempt at a Solution
Whenever I manipulate the above equations, I get a term of the form R/r, which implies, R being 5 cm, and r being the...
Homework Statement
There are two boxes, sitting right next to each other. Call the box on the left "box A" and the box on the right "Box B". A 50 pound force starts pushing A into B. Find their speed at 5 seconds, and how much force Box B puts on Box A. Box A weighs 100 pounds, Box B is 50...
Homework Statement
A soccer ball is kicked. If there is a 3 meter high fence, that is 6 meters away, compute the angle of the kick and the magnitude of the velocity of a ball.
Homework Equations
a_y=-g
v_y=-gt+v_y_0
s_y=-(1/2)gt^2+v_y_0(t)
v_x is constant: we neglect air resistance.
6=v_x_0t...
The difference is the rope that is being pulled on counts for our division, whereas in the other ones, they do not!
Moreover, in the first one, I can define the rate at which the object is traveling as a single vsomething and a coefficient, in this case, ALL of the ropes are pulling on the...