Homework Statement
The plates of a spherical capacitor have radii 30.3 mm and 33.1 mm. (a) Calculate the capacitance in picofarads. (b) What must be the plate area in square centimeters of a parallel-plate capacitor with the same plate separation and capacitance?
Homework Equations
C=...
Yeah. Luckily I found that somewhere else or I'd still be lost. I don't know what the direction is , don't care to find it because the question doesn't ask for it. But it will have something to do with arctan(y/x) ;)
Homework Statement
A shell is shot with an initial velocity 0 of 23 m/s, at an angle of θ0 = 54° with the horizontal. At the top of the trajectory, the shell explodes into two fragments of equal mass (Fig. 9-42). One fragment, whose speed immediately after the explosion is zero, falls...
You know the initial K and U and u know at the max compression of the spring the energy is just the elastic potential energy 1/2kx^2 and you can set them equal because the energy is conserved
I'm stumped. Here is what the hint reads: "You then need to set up an energy equation: initial mechanical energy - energy transferred to thermal energy = final mechanical energy."
So I have been trying:
106J-(mg/cos27)(0.42)d=mgdsin27
=>d=106J/(mgsin27+(mg/cos27)(0.42))
with mg/cos27 being...
Ok, so we have
106J+0J=mgdsin27-(0.42)d
=>106J= d(mgsin27-0.42)
=>d=106J/(mgsin27-0.42)
Just realized: we can assume Kf=0 because the bundle will be stopped?