Recent content by cdlegendary

1.Problem: A thermodynamic system has a large number of possible microscopic states. If you double the number of possible microscopic states, what happens to the entropy of the system? it decreases it remains the same it increases, but by a factor less than 2 it increases by a factor...

Ah I see. I thought I could use the average velocity to get the acceleration. I guess not. Well, when I use the d = (at^2)/2 equation, I get the acceleration to be 5.8m/s^2, not 2.4. What am I doing wrong? a = 2d/t^2 = 2(290)/(10^2)

Homework Statement A 5.10 kg instrument is hanging by a vertical wire inside a spaceship that is blasting off at the surface of the earth. This ship starts from rest and reaches an altitude of 290 m in 10.0 s with constant acceleration. a.) Draw a free-body diagram for the instrument...

would the derivative be:

derivative of r(t) is: My main issue is I can't find the derivative of a(t) from the v(t) eq. or at least, I seem to be doing it wrong.

Alright sorry, whole question is up.

Homework Statement To find the velocity and acceleration vectors for uniform circular motion and to recognize that this acceleration is the centripetal acceleration. Suppose that a particle's position is given by the following expression: A.) Choose the answer that best completes the...

Haha wow I got confused there for a sec. I see how it works now, thanks a lot !

Ah okay, thanks. So that would mean since the radius is halved, the linear velocity would be halved as well? If that's the case, then I would assume that the acceleration is quadrupled since both velocity and radius are being halved?

Uhhh no I don't know how to calculate the linear velocity. I'm guessing the linear velocity changes if the radius changes eh? Only formula I'm familiar with is the a = V^2/R, and the other variation.

Homework Statement A laboratory centrifuge on Earth makes n rpm (rev/min) and produces an acceleration of 3.70 g at its outer end. a.) What is the acceleration g's at a point halfway out to the end? Homework Equations a = (V^2)/R The Attempt at a Solution I really don't know...

Hmm but wouldn't there be two unknowns for that equation? I tried setting the equation equal to itsel but it turned out kind of badly, haha...

Homework Statement A ball is thrown straight up from the edge of the roof of a building. A second ball is dropped from the roof a time of 1.14 s later. You may ignore air resistance. A.) If the height of the building is 20.6 m, what must the initial speed be of the first ball if both are...

Homework Statement You are given vectors vec A= 4.6i - 6.6j and vec B= - 3.0i + 7.2j. A third vector vec C lies in the xy-plane. Vector vec C is perpendicular to vector vec A and the scalar product of vec C with vec B is 18.0. (the i and j are hat values, they have a ^ over them)...

Homework Statement A patient in therapy has a forearm that weighs 23.0 N and that lifts a 114.0 N weight. These two forces have direction vertically downward. The only other significant forces on his forearm come from the biceps muscle (which acts perpendicularly to the forearm) and the force...