Recent content by 3ephemeralwnd

Homework Statement A vertical tube is closed at one end and open to air at the other end. The air pressure is 1.01 x 10^5 Pa. The tube has a length of 0.75 m. Mercury (mass density = 13,600 kg/m3) is poured into it to shorten the effective length for standing waves. What is the absolute...

Homework Statement A heat pump heats a house in winter by extracting heat from the cold outdoors and releasing it into the warm interior. for the transfer of a given amount of heat, (a) how do the entropies of the interior and exterior of the house change (increase or decrease) b)which...

Fnet = fg(x) ma = mgsin(theta) a = gsin(theta) ?

there is a pendulum with mass m, attached to the end of a string, oscillating back and forth between angles of -45 degrees and +45 degrees relative to the vertical axis at which point would the tension be a maximum? and at what 2 angles would the tension in the string be half of its maximum...

is it the ball bouncing back? since the momentum of the clay ball after collision is 0

Homework Statement A 0.1 kg rubber ball and a 0.1 kg clay ball are both thrown at the wall with the same initial velocity. the rubber ball bounces, the clay ball sticks. Which exerts a larger impulse on the wall?

oh sorry! i figured out my mistake after the substituion i accidentally wrote it as w/2 instead of 1/2w thanks for the reply though :)

Oh sorry, i forgot to mention that the experiment was conducted on an air table

thank you!

the question: integrate y= arctanx for 0< x <1 i know to solve this question you should use the method of integral by parts, so i tried doing that and at some point i got x arctanx - integral of x/1+x^2 (between 0 and 1) .. from this point on i tried using the substitution method, w = 1...

I recently did an experiment in class that involved two parts, 1) the collision of 2 metal pucks 2) the collision of 2 magnetic pucks following the analysis, i discovered that in part 1, 75% of the original kinetic energy, and 93% of the original momentum was conserved after the collision...

can someone explain what happened after the part where it says "= warcsinw - integral of w/sqrt(1-w^2) = ... " ? i don't see how they got sqrt(1-w^2) + C

Ive just started learning about integration and antiderivatives in class, and I've got a question Say we have: f(x) = 1/x^3 , and f'(x) = F(x) g(x) = 1/X , and g'(x) = G(x) then to find the antiderivative of f(x), i would solve it like this: first rewrite it as : x^(-3), = x^(-3 + 1) / (...

oh, the force of gravity.. so Fg = Fs? but doesn't that mean Fnet is 0

i tried using energy .. Eg lost by rocket = Ee gained by spring but i got 40 cm instead of 20 (why is this wrong?) and how would you solve the problem using hooke's law?