I wrote down the equations and saw that the Normals would cancel out, so I didn't really bother with what it is actually equal to. But I figure it doesn't actually equal that because there are more accelerations involved that just gravity.
I set it up in terms of horizontal and vertical forces now and I think I have the right answer:
M*N*sin(B) + Ncos(b) - mg = 0 for vertical forces, or essentially the friction forces vertical component + the normal force component - the weight will be zero.
Nsin(B) - M*Ncos(B) = ma for...
A block rests on a wedge inclined at angle B. The coefficient of friction between the block and plane is mu (but let's just call this M). The wedge is given horizontal acceleration A. Assuming tan B > M (essentially that the block will slide down), find the minimum and maximum acceleration...
The way I wrote it is the exact way the problem was worded on the test. I thought my way was right, and the teacher said that it would equal, like curious said, 2 S(0 to x) e^(-t^2), but then he said to do the derivative of that, you would need to plug in the x for t, then take the derivative...
S will be my integral sign. Find the derivative of this:
S(from -x to x) e^(-(t)^2) dt
I found it to be 2e^(-x^2)
My teacher says it is 4xe^(-x^2), or maybe a negative in front of the 4 (I forgot), which is also what the math book she got it out of says.
I don't really agree with this...
Found out I was using the wrong densities ^^ I used 1.3 kg/m^3 for air and 13700 for Hg and got the right answer. My physics book is too big to bring home, so I rely on google for my constants :(
Ok, Air flows through this tube at a rate of 1200 cm^3/s. Assume that air is an ideal fluid.
What is the height h of mercury in the right side of the U-tube?
Here's a picture:
http://session.masteringphysics.com/problemAsset/1001181/6/knight_Figure_15_64.jpg
First, I found the velocity of...
In a military test, a 575 kg unmanned spy plane is traveling north at an altitude of 2700 m and a speed of 450 m/s. It is intercepted by a 1280 kg rocket traveling east at 725 m/s. If the rocket and spy plane become enmeshed in a tangled mess, how far from the point of impact do they hit the...