Calculate the mass of two pith balls on string if a 12 microCoulomb charge on each holds them at an angle of 10 degrees apart on 10.0 cm strings.
1. If a tuning fork resonates over a double-open-ended tube of L=0.40 m, what is the frequency?
2. Draw the tube and standing wave.
3. What is the wave speed and wavelength of a 0.75 m long guitar string playing a middle-C of 256 Hz?
Use the ULG and centripetal force to calculate Earth's orbital velocity (speed), and check your answer geometrically.
If the average solar irradiance on Earth is 1.36 kW/m^2, what would it be on Pluto at 35 AU from the sun?