i thought the same thing, y = 0, but it wasn't given. part (a) of the problem was revolution around the x-axis. i just implicitly assumed it was. so what would p(x) be in this region.
In calculus II, graphing a function and then revolving it around an axis. calculate that volume either by disk/washer method or shell method.
and the formula for the shell method is 2\pi \int_{a}^{b} (p(y)h(y))\,dy
o:)
Homework Statement
y=x^(1/2) x=4
find volume of revolution about the line x=4
this was a test problem and i chose x as p(x) [radius] but now i think that it should've been (x+4).
:confused:
Homework Statement
http://c811106.r6.cf2.rackcdn.com/se05h01043.png
Homework Equations
The Attempt at a Solution
The negative sign in front of x^2 is giving me trouble.
When i complete the square i get; \sqrt{}-x^2-4x+4 -4
There's some algebra that i don't understand.
Rotational Inertia "Four point masses problem--diagonal"
Homework Statement
Four point masses of 3.0 kg each are arranged in a square on mass-less rod. The length of a side of the square is .50 m. What is the rotational Inertia for rotation about an axis passing through masses A and C...
That's a huge mistake on my part. The whole point of conservation of energy is that everything in the system is conserved, so i can't add new mass. Thank you!
KE+PE = KE+PE
1/2 * 2.8 kg * v^(2) = 2.8kg * g * 1.5m
v=5.42 m/s
mv+mv=(m+m)v
.5 kg * v + 0 = (2.8kg)5.42 m/s
v= 30.4 m/s
I'm a bit confused here. Did i get the right answer, but just with not the best approach?
And i now see how this speed isn't unrealistically high, thanks.
Homework Statement
An 85kg baseball player is running towards home base at 8.0 m/s when he crashes into the catcher who is initially at rest. the two players slide together along the base path toward home plate. If the mass of the catcher is 95 kg and the coefficient of kinetic friction...
Homework Statement
Leonard wants to know how fast he can throw a ball, so he hangs a 2.3 kg target on a rope from a tree. He picks up a 0.5 kg ball of clay and throws it horizontally against the target. The clay sticks to the target and the clay and the target swing up to a height of 1.5m...
hopefully your psyche class teaches you to be less anxious, jeez. one reason I'm embarrassed of being a student is because of stuff like this. don't worry about your grades. EVERY lecture i attend, people are always conversing over something to do with their worries about grades. in short you...
It's about time to register for the spring semester in my cc, and I'm not sure whether i should enroll in calc based physics course or finish a second non calc based one. In this semester I am enrolled in a non-calc based general physics course, because I am still working on finishing calc I...