### Find the magnitude of the electric flux through the bottom

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Q. A 200g mass on the end of a spring is pulled back 3 cm and released. There is a coefficient of friction between the table and mass of 0.7. The resonant frequency is 7.071 rad/sec.

i) What is the frequency of oscillation?
ii) What driving force would be essential to keep that mass oscillating at the original amplitude?
iii) Now that it is being driven by a driving force that leads the oscillator by pi/4 rad, where is the oscillator at t=0.5 sec?

Q. A vertical electric field of magnitude 1.8x10^4 N/C exits above the Earth's surface on a stormy day. A car with a rectangular size of 5.50 m by 2 m is travelling along the horizontal roadway. Find the magnitude of the electric flux through the bottom of the car.

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