Homework Statement
This may be simple, but I don't seem to get the right answer:
An electric field \vec{E}=100,000\hat\imath\;{\rm N}/{\rm C} causes the 5.0 {\rm g} point charge in the figure (Intro 1 figure) to hang at a 20^\circ angle.
E = 100,000 N/C, point charge weighs 5 g...
Homework Statement
A 4.24 m long, 1.27 kg rope under a tension of 475 N oscillates with a frequency of 11.2 Hz. If the oscillation amplitude is 6.32 cm, how much energy is required to keep the rope oscillating for 6.25\,{\rm s?}
Homework Equations
The Attempt at a Solution
I don't...